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Faghy PMA, Ashton DRE, McNelis MR, Arena R, Duncan DR. Attenuating post-exertional malaise in Myalgic encephalomyelitis/chronic fatigue syndrome and long-COVID: Is blood lactate monitoring the answer? Curr Probl Cardiol 2024; 49:102554. [PMID: 38561114 DOI: 10.1016/j.cpcardiol.2024.102554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Accepted: 03/27/2024] [Indexed: 04/04/2024]
Affiliation(s)
- Professor Mark A Faghy
- Biomedical and Clinical Exercise Science Research Theme, University of Derby, Derby, UK; Healthy Living for Pandemic Event Protection Network (HL-PIVOT).
| | - Dr Ruth Em Ashton
- Biomedical and Clinical Exercise Science Research Theme, University of Derby, Derby, UK; Healthy Living for Pandemic Event Protection Network (HL-PIVOT)
| | - Mr Robin McNelis
- Barnet, Enfield and Haringey Mental Health NHS Trust, Barnet, UK
| | - Ross Arena
- Department of Physical Therapy, University of Ilinois at Chicago, Chicago, USA
| | - Dr Rae Duncan
- Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle, UK
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Zhang KY, Li PL, Yan P, Qin CJ, He H, Liao CP. The significance of admission blood lactate and fibrinogen in pediatric traumatic brain injury: a single-center clinical study. Childs Nerv Syst 2024; 40:1207-1212. [PMID: 38147105 DOI: 10.1007/s00381-023-06257-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 12/15/2023] [Indexed: 12/27/2023]
Abstract
BACKGROUND Traumatic brain injury (TBI) is a significant cause of morbidity and mortality in pediatric patients, leading to long-term physical, cognitive, and psychological impairments. Blood lactate and fibrinogen levels have emerged as potential biomarkers associated with tissue hypoperfusion and coagulation dysfunction, respectively. However, limited research has specifically focused on the significance of these biomarkers in pediatric TBI. This study aimed to investigate the clinical significance of blood lactate and fibrinogen levels upon admission in pediatric patients with traumatic brain injury. METHODS The medical records of 80 children with a traumatic brain injury who were admitted from January 2017 to January 2021 were retrospectively analyzed. The two groups were compared according to whether the blood lactate in the admission arterial blood gas increased and the fibrinogen content in the coagulation function decreased. The clinical data of the children in the two groups were different, and then they were divided into a good prognosis group and a poor prognosis group according to the GOS prognostic score, and the differences in the clinical indicators of the two groups were compared. RESULTS Among the 80 patients, 33 had elevated blood lactate levels, 34 had decreased fibrinogen levels, and 29 had an unfavorable outcome (GOS < 4). Compared to the normal blood lactate group, there were no statistically significant differences in age, sex ratio, or platelet count in the elevated blood lactate group (P > 0.05). However, the elevated blood lactate group had lower Glasgow Coma Scale (GCS) scores upon admission, higher blood lactate levels, lower fibrinogen levels, longer hospital stay, lower GOS scores, and a higher proportion of GOS < 4 (P < 0.05). Compared to the normal fibrinogen group, there were no statistically significant differences in age, sex ratio, or platelet count in the decreased fibrinogen group (P > 0.05). However, the decreased fibrinogen group had lower GCS scores upon admission, higher blood lactate levels, lower fibrinogen levels, longer hospital stays, lower GOS scores, and a higher proportion of GOS < 4 (P < 0.05). Compared to the favorable outcome group, there were no statistically significant differences in age, sex ratio, or platelet count in the unfavorable outcome group (P > 0.05). However, the unfavorable outcome group had lower GCS scores upon admission, higher blood lactate levels, lower fibrinogen levels, longer hospital stays, a higher incidence of pulmonary infection, a higher incidence of stress ulcers, and lower GOS scores (P < 0.05). CONCLUSION The levels of blood lactate and fibrinogen may represent the severity of children with traumatic brain injury and may be risk factors for poor prognosis of children with traumatic brain injury.
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Affiliation(s)
- Kun-Yuan Zhang
- Department of Neurosurgery, Second People's Hospital of Pingchang, Pingchang, Sichuan, P.R. China
| | - Pei-Long Li
- Kunming Children's Hospital, Children's Hospital Affiliated to Kunming Medical University, Kunming Medical University, Kunming, P.R. China
| | - Peng Yan
- Department of Neurosurgery, Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, Guangxi, P.R. China
| | - Cheng-Jian Qin
- Department of Neurosurgery, Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, Guangxi, P.R. China
| | - Hao He
- Department of Neurosurgery, Second People's Hospital of Pingchang, Pingchang, Sichuan, P.R. China
| | - Chang-Pin Liao
- Department of Neurosurgery, People's Hospital of Baise, No. 8, Chengxiang Street, Youjiang District, Baise, Guangxi, P.R. China.
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Fujita D, Kubo Y. Influence of blood lactate variations and passive exercise on cardiac responses. J Phys Ther Sci 2024; 36:69-73. [PMID: 38304152 PMCID: PMC10830155 DOI: 10.1589/jpts.36.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 11/16/2023] [Indexed: 02/03/2024] Open
Abstract
[Purpose] This study aimed to investigate cardiovascular responses, including heart rate (HR) and heart rate variability (HRV), to various hyperlactatemia-passive exercise interactions. [Participants and Methods] Nine healthy male participants performed upper limb passive cycling movement, and their HR and HRV were assessed while their blood lactate levels were manipulated by sustained handgrip exercise at control, 15% maximum voluntary contraction (MVC), and 30% MVC, followed by postexercise circulatory occlusion. [Results] HR and root mean squared standard difference (rMSSD) of HRV response remained constant at all blood lactate levels during passive exercise (HR: control, 75.8 ± 3.4 bpm; 15% MVC, 76.9 ± 2.7 bpm; and 30% MVC, 77.0 ± 3.7 bpm; rMSSD: control, 33.2 ± 6.9 ms; 15% MVC, 36.3 ± 7.3 ms; and 30% MVC, 37.3 ± 8.9 ms). [Conclusion] Manipulating metaboreflex activation did not significantly alter HR or HRV during passive exercise. These results suggest that, in healthy participants, the interactions between mechanical and metabolic stimuli do not affect HR and HRV responses, implying that passive exercise may be safely implemented.
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Affiliation(s)
- Daisuke Fujita
- Department of Physical Therapy, Faculty of Medical Science,
Fukuoka International University of Health and Welfare: 3-6-40 Momochihama, Sawara-ku,
Fukuoka-shi, Fukuoka 814-0001, Japan
| | - Yusuke Kubo
- Department of Rehabilitation, Kobori Orthopedic Clinic,
Japan
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Kominami K, Akino M. Partial Pressure of End-Tidal Oxygen and Blood Lactate During Cardiopulmonary Exercise Testing in Healthy Older Participants and Patients at Risk of Cardiac Disease. Cardiol Res 2024; 15:29-36. [PMID: 38464709 PMCID: PMC10923256 DOI: 10.14740/cr1597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Accepted: 01/03/2024] [Indexed: 03/12/2024] Open
Abstract
Background The partial pressure of end-tidal oxygen (PETO2) and end-tidal oxygen concentration (ETO2) are among the indices that can be measured by exhaled gas analysis. Several observational studies have shown that skeletal muscle function is impaired in patients with cardiac disease; thus, the assessment of skeletal muscle function is important. Additionally, although it has recently been suggested that the difference in PETO2 from rest to the ventilatory anaerobic threshold (VAT) reflects oxygen availability in peripheral factors, primarily skeletal muscle, the evidence for this is not well established. Therefore, we hypothesized and investigated whether increased blood lactate (BLa) levels, resulting from decreased skeletal muscle and mitochondrial oxygen availability, and PETO2 dynamics during cardiopulmonary exercise testing (CPET) would be related. Methods All participants performed the symptomatic limited CPET, and their BLa levels were measured. The difference in PETO2 and ETO2 from rest to VAT determined by the V-slope method (ΔPETO2 and ΔETO2) was calculated and compared with the increase in BLa due to exercise testing. Results We recruited 22 healthy older participants (nine males; 69.4 ± 6.8 years) and 11 patients with cardiovascular risk (eight males; 73.0 ± 8.8 years). ΔPETO2 and ΔETO2 did not differ between the two groups (P = 0.355 and P = 0.369, respectively), showing no correlation between increase in BLa from rest to VAT, but were significantly correlated with an increase in BLa from rest to the end of exercise (ΔPETO2, P = 0.030; ΔETO2, P = 0.029). The correlation was particularly pronounced among those at cardiovascular risk (ΔPETO2, P = 0.012; ΔETO2, P = 0.011). Conclusions ΔPETO2 and ΔETO2 from rest to VAT during CPET may be useful as indices reflecting skeletal muscle oxygen utilization capacity.
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Affiliation(s)
- Kazuyuki Kominami
- Department of Rehabilitation, Sanseikai Kitano Hospital, 6-30, 1- chome, Kitano 1-jyo, Kiyota-ku, Sapporo, Hokkaido 004-0861, Japan
| | - Masatoshi Akino
- Department of Internal Medicine, Sapporo Kiyota Hospital, 1-1, 1-chome, Shin-ei 1-jyo, Kiyota-ku, Sapporo, Hokkaido 004-0831, Japan
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Borrelli M, Shokohyar S, Rampichini S, Bruseghini P, Doria C, Limonta EG, Ferretti G, Esposito F. Energetics of sinusoidal exercise below and across critical power and the effects of fatigue. Eur J Appl Physiol 2024:10.1007/s00421-023-05410-1. [PMID: 38242972 DOI: 10.1007/s00421-023-05410-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 12/23/2023] [Indexed: 01/21/2024]
Abstract
PURPOSE Previous studies investigating sinusoidal exercise were not devoted to an analysis of its energetics and of the effects of fatigue. We aimed to determine the contribution of aerobic and anaerobic lactic metabolism to the energy balance and investigate the fatigue effects on the cardiorespiratory and metabolic responses to sinusoidal protocols, across and below critical power (CP). METHODS Eight males (26.6 ± 6.2 years; 75.6 ± 8.7 kg; maximum oxygen uptake 52.8 ± 7.9 ml·min-1·kg-1; CP 218 ± 13 W) underwent exhausting sinusoidal cycloergometric exercises, with sinusoid midpoint (MP) at CP (CPex) and 50 W below CP (CP-50ex). Sinusoid amplitude (AMP) and period were 50 W and 4 min, respectively. MP, AMP, and time-delay (tD) between mechanical and metabolic signals of expiratory ventilation ([Formula: see text]), oxygen uptake ([Formula: see text]), and heart rate ([Formula: see text]) were assessed sinusoid-by-sinusoid. Blood lactate ([La-]) and rate of perceived exertion (RPE) were determined at each sinusoid. RESULTS [Formula: see text] AMP was 304 ± 11 and 488 ± 36 ml·min-1 in CPex and CP-50ex, respectively. Asymmetries between rising and declining sinusoid phases occurred in CPex (36.1 ± 7.7 vs. 41.4 ± 9.7 s for [Formula: see text] tD up and tD down, respectively; P < 0.01), with unchanged tDs. [Formula: see text] MP and RPE increased progressively during CPex. [La-] increased by 2.1 mM in CPex but remained stable during CP-50ex. Anaerobic contribution was larger in CPex than CP-50ex. CONCLUSION The lower aerobic component during CPex than CP-50ex associated with lactate accumulation explained lower [Formula: see text] AMP in CPex. The asymmetries in CPex suggest progressive decline of muscle phosphocreatine concentration, leading to fatigue, as witnessed by RPE.
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Affiliation(s)
- Marta Borrelli
- Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Via Giuseppe Colombo 71, 20133, Milan, Italy
| | - Sheida Shokohyar
- Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Via Giuseppe Colombo 71, 20133, Milan, Italy
| | - Susanna Rampichini
- Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Via Giuseppe Colombo 71, 20133, Milan, Italy.
| | - Paolo Bruseghini
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Christian Doria
- Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Via Giuseppe Colombo 71, 20133, Milan, Italy
| | - Eloisa Guglielmina Limonta
- Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Via Giuseppe Colombo 71, 20133, Milan, Italy
- IRCCS Ospedale Galeazzi - Sant'Ambrogio, Via Cristina Belgioioso, 173, 20157, Milan, Italy
| | - Guido Ferretti
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - Fabio Esposito
- Department of Biomedical Sciences for Health, Università Degli Studi Di Milano, Via Giuseppe Colombo 71, 20133, Milan, Italy
- IRCCS Ospedale Galeazzi - Sant'Ambrogio, Via Cristina Belgioioso, 173, 20157, Milan, Italy
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Hori K, Uchida Y, Kokubo K, Matsuzawa N, Kamegamori A, Iizuka T, Saito Y, Shiota K, Kidooka S, Inoue M. Factors associated with elevated blood lactate levels in patients undergoing maintenance hemodialysis. J Artif Organs 2023; 26:212-219. [PMID: 35939152 DOI: 10.1007/s10047-022-01355-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 07/23/2022] [Indexed: 10/15/2022]
Abstract
Factors associated with chronic elevation of the blood lactate levels in patients undergoing chronic maintenance hemodialysis (hereinafter, hemodialysis patients) have not yet been thoroughly investigated. The purpose of the present study was to clarify factors associated with elevated blood lactate levels in hemodialysis patients. We divided the hemodialysis patients into two groups according the blood lactate levels (the high blood lactate group [> 2 mmol/L] and normal blood lactate group), and conducted a retrospective comparison of the following items between the two groups: (1) the creatinine generation rate (%CGR) and the geriatric nutrition risk index (GNRI) as indices of the nutritional status; (2) the left ventricular ejection fraction (LVEF) and E/A, an indicator of diastolic function; (3) the ankle-brachial index (ABI) and transcutaneous partial pressure of oxygen as indices of the adequacy of circulation in the peripheral blood vessels of the lower extremities; (4) the white blood cell count and serum level of C-reactive protein (CRP) before dialysis as markers of an inflammatory state. The mean age and serum CRP level were significantly higher in the high blood lactate group than in the normal blood lactate group. There were no significant differences in the markers of the nutritional status, cardiac function, or adequacy of circulation in the peripheral blood vessels of the lower extremities between the two groups. Advanced age and a state of chronic inflammation appear to be associated with elevated blood lactate levels in patients undergoing chronic maintenance hemodialysis.
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Affiliation(s)
- Kazuyoshi Hori
- Department of Life and Environmental Sciences, Teikyo University of Science, 2-2-1 Senjyusakuragi, Adachiku, Tokyo, 120-0045, Japan.
| | - Yasutaka Uchida
- Department of Life and Environmental Sciences, Teikyo University of Science, 2-2-1 Senjyusakuragi, Adachiku, Tokyo, 120-0045, Japan
| | - Kenichi Kokubo
- Kitasato University School of Allied Health Sciences, 1-15-1 Kitasato Sagamihara Minamiku, Kanagawa, 252-0373, Japan
| | - Naoya Matsuzawa
- Department of Clinical Engineering, Katori Omigawa Medical Center, 438-1, Minamiharachishinden, Katori City, Chiba, 289-0332, Japan
| | - Anna Kamegamori
- Department of Clinical Engineering, Katori Omigawa Medical Center, 438-1, Minamiharachishinden, Katori City, Chiba, 289-0332, Japan
| | - Tomoya Iizuka
- Department of Clinical Engineering, Katori Omigawa Medical Center, 438-1, Minamiharachishinden, Katori City, Chiba, 289-0332, Japan
| | - Yusuke Saito
- Department of Clinical Engineering, Katori Omigawa Medical Center, 438-1, Minamiharachishinden, Katori City, Chiba, 289-0332, Japan
| | - Kenji Shiota
- Department of Clinical Engineering, Katori Omigawa Medical Center, 438-1, Minamiharachishinden, Katori City, Chiba, 289-0332, Japan
| | - Satoshi Kidooka
- Department of Clinical Engineering, Katori Omigawa Medical Center, 438-1, Minamiharachishinden, Katori City, Chiba, 289-0332, Japan
| | - Masahiro Inoue
- Department of Medicine, Katori Omigawa Medical Center, 438-1, Minamiharachisinden Katori City, Chiba, 289-0332, Japan
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Singh R, Singh V, Kumari P, Aggarwal N, Oberoi M, Khan H, Singh TG. Evolutionary unmasking Resuscitative therapeutics potential of centhaquin citrate in hypovolemic shock. CNS Neurol Disord Drug Targets 2023:CNSNDDT-EPUB-132646. [PMID: 37357510 DOI: 10.2174/1871527322666230623113013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 04/22/2023] [Accepted: 05/05/2023] [Indexed: 06/27/2023]
Abstract
Hypovolemic shock (HS), a clinical condition of insufficient blood perfusion and oxygenation in body tissues, is associated with immense morbidity and mortality. Treatment approaches include fluid replacement and surgical repair of reversible causes of hemorrhage; however, they cause irreversible blood perfusion loss, systemic inflammation, multiple organ failure, and death. Centhaquin citrate (CC) is an innovative centrally acting cardiovascular active agent that is initially intended as an antihypertensive drug. However, due to its positive ionotropic effect, Centhaquin citrate is being tested clinically as a resuscitative agent for the management of hypovolemic shock It acts at the α2B-adrenergic receptor to produce venous constriction followed by an increase in venous return to the heart. These actions are assumed to be capable of resuscitative activity observed by centhaquin citrate, through an increase in cardiac output and tissue perfusion. Pharmacokinetics investigations in animals and humans have shown that centhaquin citrate is well tolerated and has insignificant side effects. Therefore, centhaquin citrate seems to be a promising entity and gaining the interest of researchers to develop it as a resuscitative agent in HS. The review gives insight into the development of centhaquin citrate as a resuscitative agent and provides insight into the associated mechanism of action and molecular signalling to foster future research on CC for its clinical use in HS.
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Affiliation(s)
- Ravinder Singh
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Varinder Singh
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Pratima Kumari
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Namita Aggarwal
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Muskaan Oberoi
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Heena Khan
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
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Frechette ML, Scott BR, Vallence AM, Cook SB. Acute physiological responses to steady-state arm cycling ergometry with and without blood flow restriction. Eur J Appl Physiol 2023; 123:901-909. [PMID: 36580109 DOI: 10.1007/s00421-022-05118-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 12/12/2022] [Indexed: 12/30/2022]
Abstract
PURPOSE To compare heart rate (HR), oxygen consumption (VO2), blood lactate (BL), and ratings of perceived exertion (RPE) during arm cycling with and without a blood flow restriction (BFR). METHODS Twelve healthy males (age: 23.9 ± 3.75 years) completed four, randomized, 15-min arm cycling conditions: high-workload (HW: 60% maximal power output), low-workload (LW: 30% maximal power output), low-workload with BFR (LW-BFR), and BFR with no exercise (BFR-only). In the BFR conditions, cuff pressure to the proximal biceps brachii was set to 70% of occlusion pressure. HR, VO2, and RPE were recorded throughout the exercise, and BL was measured before, immediately after, and five minutes post-exercise. Within-subject repeated-measures ANOVA was used to evaluate condition-by-time interactions. RESULTS HW elicited the greatest responses in HR (91% of peak; 163.3 ± 15.8 bpm), VO2 (71% of peak; 24.0 ± 3.7 ml kg-1 min-1), BL (7.7 ± 2.5 mmol L-1), and RPE (14 ± 1.7) and was significantly different from the other conditions (p < 0.01). The LW and LW-BFR conditions did not differ from each other in HR, VO2, BL, and RPE mean of conditions: ~ 68%, 41%, 3.5 ± 1.6 mmol L-1, 10.4 ± 1.6, respectively; p > 0.05). During the BFR-only condition, HR increased from baseline by ~ 15% (on average) (p < 0.01) without any changes in VO2, BL, and RPE (p > 0.05). CONCLUSIONS HW arm cycling elicited the largest and most persistent physiological responses compared to LW arm cycling with and without a BFR. As such, practitioners who prescribe arm cycling for their clients should be advised to augment the demands of exercise via increases in exercise intensity (i.e., power output), rather than by adding BFR.
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Affiliation(s)
- Mikaela L Frechette
- Department of Kinesiology, University of New Hampshire, 124 Main Street, New Hampshire Hall, Durham, NH, 03824, USA
| | - Brendan R Scott
- Centre for Healthy Ageing, Health Futures Institute, Murdoch University, Perth, Australia
- Murdoch Applied Sports Science Laboratory, Discipline of Exercise Science, Murdoch University, Perth, Australia
| | - Ann-Maree Vallence
- Discipline of Psychology, Murdoch University, Perth, Australia
- Centre for Healthy Ageing, Health Futures Institute, Murdoch University, Perth, Australia
- Centre for Molecular Medicine and Innovative Therapeutics, Murdoch University, Perth, Australia
| | - Summer B Cook
- Department of Kinesiology, University of New Hampshire, 124 Main Street, New Hampshire Hall, Durham, NH, 03824, USA.
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Renuka MK, Sailaja B. Blood Lactate in Early Sepsis: A Predictor to "Keep Up" Rather than "Catch Up". Indian J Crit Care Med 2023; 27:83-84. [PMID: 36865518 PMCID: PMC9973062 DOI: 10.5005/jp-journals-10071-24406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 02/04/2023] Open
Abstract
How to cite this article: Renuka MK, Sailaja B. Blood Lactate in Early Sepsis: A Predictor to "Keep Up" Rather than "Catch Up". Indian J Crit Care Med 2023;27(2):83-84.
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Affiliation(s)
- MK Renuka
- Department of Critical Care Medicine, Sri Ramachandra Medical College, Chennai, Tamil Nadu, India,MK Renuka, Department of Critical Care Medicine, Sri Ramachandra Medical College, Chennai, Tamil Nadu, India, Phone: +91 8056126336, e-mail:
| | - Baby Sailaja
- Department of Critical Care Medicine, Sri Ramachandra Medical College, Chennai, Tamil Nadu, India
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Uddin MK, Hasan S, Peltoniemi O, Oliviero C. The effect of piglet vitality, birth order, and blood lactate on the piglet growth performances and preweaning survival. Porcine Health Manag 2022; 8:52. [PMID: 36564789 PMCID: PMC9789625 DOI: 10.1186/s40813-022-00299-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Litter size is going up in modern pig production. Due to large litter size and increased farrowing duration, newborn piglets, during parturition, can suffer from asphyxiation. This alters their blood energy parameters and can contribute to their reduced vitality at birth, which is detrimental to their growth performance and survival. We aimed to evaluate the effects of vitality score, piglets' umbilical cord blood lactate, glucose, and butyrate, and birth order on growth performance and the preweaning mortality of piglets. RESULTS The more vital (vitality score 2, VS2) piglets had higher umbilical cord blood glucose and butyrate, lower blood lactate, and higher colostrum intake (CI) at birth, and showed higher body weight at birth and at weaning than did less vital piglets (vitality score 1, VS1). Umbilical cord lactate negatively correlated with vitality, colostrum intake, and growth before weaning. Among the four birth-order groups (BOGs), piglets born earlier during parturition had a higher mean vitality score than those born later. BOG1 and BOG2 had significantly higher CI (p < 0.05) than BOG3 and BOG4. CONCLUSION Changes in piglets' body weight, colostrum intake, and umbilical cord lactate are associated with piglet vitality and asphyxiation during farrowing. In addition, asphyxiation induced higher umbilical cord lactate may serve as an indicator of low vitality and low colostrum consumption. Overall, improvement in piglets' vitality and in the farrowing process can help in reducing piglet mortality.
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Affiliation(s)
- Md Karim Uddin
- grid.7737.40000 0004 0410 2071Department of Production Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Shah Hasan
- grid.7737.40000 0004 0410 2071Department of Production Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Olli Peltoniemi
- grid.7737.40000 0004 0410 2071Department of Production Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Claudio Oliviero
- grid.7737.40000 0004 0410 2071Department of Production Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
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Benjanuvatra N, Bradbury D, Landers G, Goods PSR, Girard O. How does multi-set high-load resistance exercise impact neuromuscular function in normoxia and hypoxia? Eur J Sport Sci 2022:1-10. [PMID: 35770524 DOI: 10.1080/17461391.2022.2095929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study examined whether hypoxia during multi-set, high-load resistance exercise alters neuromuscular responses. Using a single-blinded (participants), randomised crossover design, eight resistance-trained males completed five sets of five repetitions of bench press at 80% of one repetition maximum in moderate normobaric hypoxia (inspiratory oxygen fraction = 0.145) and normoxia. Maximal isometric bench press trials were performed following the warm-up, after 10 min of altitude priming and 5 min post-session (outside, inside and outside the chamber, respectively). Force during pre-/post-session maximal voluntary isometric contractions and bar velocity during exercise sets were measured along with surface electromyographic (EMG) activity of the pectoralis major, anterior deltoid and lateral and medial triceps muscles. Two-way repeated measures ANOVA (condition×time) were used. A significant time effect (p = 0.048) was found for mean bar velocity, independent of condition (p = 0.423). During sets of the bench press exercise, surface EMG amplitude of all studied muscles remained unchanged (p > 0.187). During maximal isometric trials, there were no main effects of condition (p > 0.666) or time (p > 0.119), nor were there any significant condition×time interactions for peak or mean forces and surface EMG amplitudes (p > 0.297). Lower end-exercise blood oxygen saturation (90.9 ± 1.8 vs. 98.6 ± 0.6%; p < 0.001) and higher blood lactate concentration (5.8 ± 1.4 vs. 4.4 ± 1.6 mmol/L; p = 0.007) values occurred in hypoxia. Acute delivery of systemic normobaric hypoxia during multi-set, high-load resistance exercise increased metabolic stress. However, only subtle neuromuscular function adjustments occurred with and without hypoxic exposure either during maximal isometric bench press trials before versus after the session or during actual exercise sets.
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Affiliation(s)
- N Benjanuvatra
- School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Western Australia, Australia
| | - D Bradbury
- School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Western Australia, Australia
| | - G Landers
- School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Western Australia, Australia
| | - P S R Goods
- School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Western Australia, Australia.,Murdoch Applied Sports Science Laboratory, Murdoch University, WA, Australia, 6150.,Centre for Healthy Ageing, Health Futures Institute, Murdoch University, WA, Australia, 6150
| | - O Girard
- School of Human Sciences (Exercise and Sport Science), The University of Western Australia, Perth, Western Australia, Australia
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12
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Xie J, Xiao W, Lin J. Effect of oXiris-CVVH on the Clinical Outcomes of Patients with Septic Shock: An Inverse Probability of Treatment-Weighted Analysis. Blood Purif 2022; 51:972-989. [PMID: 35649340 DOI: 10.1159/000524088] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 03/04/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND Limited previous studies had proved that oXiris-continuous veno-venous hemofiltration (CVVH) could decrease endotoxins and inflammatory factors, thereby improving circulation's stability. However, conclusive data are lacking regarding the comparison between oXiris membrane (with the function of removing endotoxins and decreasing inflammatory factors) and AN69 filters (with the only function of decreasing inflammatory) on the mortality of patients with septic shock. The potential mechanisms of oXiris that might influence the mortality of septic shock patients remain unexplored. METHODS This is a single-center, retrospective cohort study. The experimental group (30 patients with septic shock) was treated with oXiris-CVVH, and the control group (46 patients with septic shock) was treated with AN69 filter-CVVH. We employed the inverse probability of treatment-weighting method (IPTW), doubly robust estimation, and mediating effect analysis to analyze those clinical outcomes, with a special focus on the results of 28-day mortality, 72-h lactate, the need for norepinephrine (NE) in the next 72 h. RESULTS A total of 76 patients with septic shock who received blood purification therapies were enrolled. After IPTW, differences in patient characteristics have been minimized. The 28-day mortality in the control group is higher than in the treatment group (73.3% vs. 47.3%, p < 0.001; median survival time: 10 vs. ≥28 days, log-rank p = 0.0366). And the 25% decrease and the 50% decrease in demand for NE in the next 72 h are different between the treatment and control groups (median time of 25% decrease in demand: 24 vs. >72 h, log-rank p = 0.0126; median time of 50% decrease in demand: 24 vs. >72 h, log-rank p = 0.0322). The 72-h lactic acid level and white blood cell (WBC) counts in the oXiris group are lower than in the control group. The 72-h lactate fully mediated the effects of oXiris on 28-day mortality after confounds adjustment. CONCLUSIONS For septic shock patients, the use of oXiris-CVVH was associated with lower mortality and appeared to reduce lactate, NE dosage, PCT, and WBC counts, as compared to AN69-CVVH.
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Affiliation(s)
- Jing Xie
- General Intensive Care Unit Department, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Wenbiao Xiao
- General Intensive Care Unit Department, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Jiandong Lin
- General Intensive Care Unit Department, The First Affiliated Hospital of Fujian Medical University, Fuzhou, China
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13
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Mang ZA, Realzola RA, Ducharme J, Bellissimo GF, Beam JR, Mermier C, de Castro Magalhaes F, Kravitz L, Amorim FT. The effect of repetition tempo on cardiovascular and metabolic stress when time under tension is matched during lower body exercise. Eur J Appl Physiol 2022; 122:1485-1495. [PMID: 35394146 DOI: 10.1007/s00421-022-04941-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 03/22/2022] [Indexed: 12/31/2022]
Abstract
PURPOSE To investigate the effect of repetition tempo on cardiovascular and metabolic stress when time under tension (TUT) and effort are matched during sessions of lower body resistance training (RT). METHODS In a repeated-measures, cross-over design, 11 recreationally trained females (n = 5) and males (n = 6) performed 5 sets of belt squats under the following conditions: slow-repetition tempo (SLOW; 10 reps with 4-s eccentric and 2-s concentric) and traditional-repetition tempo (TRAD; 20 reps with 2-s eccentric and 1-s concentric). TUT (60 s) was matched between conditions and external load was adjusted so that lifters were close to concentric muscular failure at the end of each set. External load, total volume load (TVL), impulse (IMP), blood lactate, ratings of perceived exertion (RPE), HR, and muscle oxygenation were measured. RESULTS Data indicated that TVL (p < 0.001), blood lactate (p = 0.017), RPE (p = 0.015), and HR (p < 0.001) were significantly greater during TRAD while external load (p = 0.030) and IMP (p = 0.002) were significantly greater during SLOW. Whether it was expressed as minimal values or change scores, muscle oxygenation was not different between protocols. CONCLUSION When TUT is matched, TVL, cardiovascular stress, metabolic stress, and perceived exertion are greater when faster repetition tempos are used. In contrast, IMP and external load are greater when slower repetition tempos are used.
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Affiliation(s)
- Zachary A Mang
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA.
| | - Rogelio A Realzola
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | - Jeremy Ducharme
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | | | - Jason R Beam
- School of Fitness Education, Santa Fe Community College, Santa Fe, NM, 87508, USA
| | - Christine Mermier
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | - Flavio de Castro Magalhaes
- Department of Physical Education, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil
| | - Len Kravitz
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
| | - Fabiano T Amorim
- Department of Health, Exercise and Sports Sciences, University of New Mexico Albuquerque, Albuquerque, NM, USA
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14
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Yang JS, Xu ZY, Chen FX, Wang MR, Cong RC, Fan XL, He BS, Xing W. Role of clinical data and multidetector computed tomography findings in acute superior mesenteric artery embolism. World J Clin Cases 2022; 10:4020-4032. [PMID: 35665105 PMCID: PMC9131226 DOI: 10.12998/wjcc.v10.i13.4020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 02/25/2022] [Accepted: 03/16/2022] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Superior mesenteric artery embolism (SMAE) has acute onset and fast progression, which seriously threatens the life of patients. Multidetector computed tomography (MDCT) is one of the most important diagnostic methods for SMAE, which plays an important role in the diagnosis and prognosis of SMAE.
AIM To evaluate the value of combined clinical data and MDCT findings in the diagnosis of acute SMAE and predict the risk factors for SMAE-related death.
METHODS Data from 53 SMAE patients who received abdominal MDCT multi-phase enhancement and superior mesenteric artery digital subtraction angiography examinations were collected. Univariate cox regression and multivariate cox model were used to analyze the correlation between death risk and clinical and computed tomography features in SMAE patients.
RESULTS Univariate Cox regression model showed that intestinal wall thinning, intestinal wall pneumatosis, blood lactate > 2.1 mmol/L and blood pH < 7.35 increased the risk of death in patients with SMAE. After adjusting for age, sex, embolic involvement length and embolic distribution region, multivariate Cox regression model I showed that blood lactate > 2.1 mmol/L (HR = 5.26, 95%CI: 1.04-26.69, P = 0.045) and intestinal wall thinning (HR = 9.40, 95%CI: 1.05-83.46, P = 0.044) were significantly increases the risk of death in patients with SMAE.
CONCLUSION For patients with SAME, increased blood lactate and intestinal wall thinning are the risk factors for death; hence, close monitoring may reduce the mortality rate. Clinical observation combined with MDCT signs can significantly improve SMAE diagnosis.
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Affiliation(s)
- Ju-Shun Yang
- Department of Radiology, The Third Affiliated Hospital of Soochow University, Changzhou 213003, Jiangsu Province, China
- Department of Radiology, The Second Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
| | - Zhen-Yu Xu
- Department of Ultrasonography, The Second People's Hospital of Nantong, Nantong 226002, Jiangsu Province, China
| | - Fei-Xiang Chen
- Department of Radiology, The Second Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
| | - Mei-Rong Wang
- Department of Radiology, The Second Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
| | - Ruo-Chen Cong
- Department of Radiology, The Second Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
| | - Xiao-Le Fan
- Department of Radiology, The Second Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
| | - Bo-Sheng He
- Department of Radiology, The Second Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
| | - Wei Xing
- Department of Radiology, The Third Affiliated Hospital of Soochow University, Changzhou 213003, Jiangsu Province, China
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15
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Jacob N, So I, Sharma B, Marzolini S, Tartaglia MC, Green R. Effects of high-intensity interval training on blood lactate levels and cognition in healthy adults: protocol for systematic review and network meta-analyses. Syst Rev 2022; 11:31. [PMID: 35183245 PMCID: PMC8858554 DOI: 10.1186/s13643-021-01874-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 12/17/2021] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND High-intensity interval training (HIIT) has shown to confer cognitive benefits in healthy adults, via a mechanism purportedly driven by the exercise metabolite lactate. However, our understanding of the exercise parameters (e.g., work interval duration, session volume, work-to-rest ratio) that evoke a peak blood lactate response in healthy adults is limited. Moreover, evidence relating HIIT-induced blood lactate and cognitive performance has yet to be reviewed and analyzed. The primary objective of this systematic review is to use network meta-analyses to compare the relative impact of different HIIT work-interval durations, session volumes, and work-to-rest ratios on post-exercise blood lactate response in healthy adults. The secondary objective is to determine the relationship between HIIT-induced blood lactate and acute post-HIIT cognitive performance. METHODS A systematic review is being conducted to identify studies measuring blood lactate response following one session of HIIT in healthy adults. The search was carried out in (1) MEDLINE, (2) EMBASE, (3) Cochrane Central Register of Controlled Trials, (4) Sport Discus, and (5) Cumulative Index to Nursing and Allied Health Literature Plus with Full Text (CINAHL+). After abstract and full-text screening, two reviewers will independently extract data on key outcomes variables and complete risk of bias assessment using the Cochrane Risk of Bias Tool and the Risk of Bias in Non-Randomized Studies of Interventions tool. Network meta-analyses will be used to generate estimates of the comparative effectiveness of blood lactate on cognitive outcomes using corresponding rankings for each work-interval duration, session volume, and work-to-rest ratio category. Where applicable, meta-regressions analyses will be performed to test the relationship between changes in the blood lactate and changes in cognitive performance. Analyses will be conducted using MetaInsight Software. DISCUSSION This study will provide evidence on how to structure a HIIT protocol to elicit peak blood lactate response in healthy adults and will increase our understanding of the relationship between HIIT-induced blood lactate response and associated cognitive benefits. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42020204400.
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Affiliation(s)
- Nithin Jacob
- KITE Research Institute, Toronto Rehabilitation Institute-University Health Network, Toronto, Ontario, Canada.,Rehabilitation Sciences Institute, University of Toronto, Toronto, Ontario, Canada
| | - Isis So
- KITE Research Institute, Toronto Rehabilitation Institute-University Health Network, Toronto, Ontario, Canada.,Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Bhanu Sharma
- KITE Research Institute, Toronto Rehabilitation Institute-University Health Network, Toronto, Ontario, Canada.,Department of Medical Sciences, McMaster University, Toronto, Ontario, Canada
| | - Susan Marzolini
- KITE Research Institute, Toronto Rehabilitation Institute-University Health Network, Toronto, Ontario, Canada.,Rehabilitation Sciences Institute, University of Toronto, Toronto, Ontario, Canada
| | - Maria Carmela Tartaglia
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada.,Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Kembril Research Institute, Toronto Western-University Health Network, Toronto, Ontario, Canada
| | - Robin Green
- KITE Research Institute, Toronto Rehabilitation Institute-University Health Network, Toronto, Ontario, Canada. .,Department of Psychiatry, Division of Neurosciences and Clinical Translation, University of Toronto, Toronto, Ontario, Canada.
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16
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Norberto MS, De Arruda TB, Cursiol JA, De Andrade VL, De Araujo GG, Papoti M. Metformin anticipates peak of lactate during high-intensity interval training but no changes performance or neuromuscular response in amateur swimmers. Clin Nutr ESPEN 2021; 46:305-13. [PMID: 34857212 DOI: 10.1016/j.clnesp.2021.09.739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 09/14/2021] [Accepted: 09/20/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND & AIMS Metformin demonstrated potential to improve metabolic efficiency in short-intense and prolonged-continuous efforts. The present study investigates the acute effects of metformin intake on performance, rating of perceived exertion (RPE), blood lactate, blood glucose and neuromuscular parameters related to swimming high-intensity interval series. METHODS A double-blind, crossover, randomized and placebo-controlled study was carried out. Seven healthy swimmers ingested metformin (500 mg) or placebo capsules on different days and performed a typical high-intensity training series (10 bouts of 50 m with a 3-min interval). Performance, RPE, neuromuscular parameters (lower and upper limbs), blood lactate and glucose were analyzed by the Wilcoxon Signed-Rank and Friedman's tests between supplementation situations and moments, respectively (p > 0.05), the moment where glucose and blood lactate peak were found were analyzed by a Student t-test (p > 0.05) and a Bayesian repeated-measures ANOVA for effects analysis (BFincl). RESULTS The anticipation of blood glucose and peak lactate was signaling by the interaction effect (metformin increased and placebo decreased) between the eighth and the last bout (BFincl: 4.230 and 5.188 respectively). The second interaction effect of blood glucose and lactate (metformin maintained and placebo increased) during recoveries between 5 min and 7 min (BFincl: 3.825 and 3.806 respectively) also signaling the anticipatory behavior of both physiological parameters. The anticipation of blood lactate peak concentration after metformin intake confirms the anticipatory behavior of blood lactate (p: 0.015). CONCLUSIONS The anticipatory behavior of glucose was not confirmed. Although the anticipatory peak of blood lactate, metformin does not affect neuromuscular responses, RPE and performance. REGISTRATION OF CLINICAL TRIAL RBR-67wxdw8 Effects of metformin during swimmer training performance.
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17
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Lee DCW, Sheridan S, Ali A, Sutanto D, Wong SHS. Wearing compression tights post-exercise enhances recovery hemodynamics and subsequent cycling performance. Eur J Appl Physiol 2021; 121:2091-2100. [PMID: 33835198 DOI: 10.1007/s00421-021-04661-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 03/01/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE To investigate sports compression garment (CG)-induced recovery hemodynamics and their potential impact on subsequent cycling performance. METHODS In a randomized crossover design, 13 physically active men (20.9 ± 1.4 years; 65.9 ± 7.8 kg; 173.3 ± 4.8 cm; peak power output 254.2 ± 27.2 W) underwent 2 experimental trials. During each experimental trial, the subjects performed 20-min fatiguing preload cycling followed by 60-min passive recovery wearing either a sports CG (28.6 ± 9.4 mmHg) or gymnastic pants (CON). A 5-min all-out cycling performance test was subsequently conducted and power output and cadence were recorded. Cardiac output (CO) and stroke volume (SV) were measured using Doppler ultrasound (USCOM®). Heart rate (HR), blood lactate [BLa-], ratings of perceived exertion (RPE), leg muscle soreness (LMS), mean arterial pressure (MAP) and systemic vascular resistance (SVR) were monitored at 5, 15, 30, 45, 60 min during passive recovery. RESULTS During the subsequent 5-min all-out cycling performance test, power output (215.2 ± 24.0 vs. 210.8 ± 21.5 W, CG vs. CON) and cadence (72.5 ± 3.8 vs. 71.2 ± 4.8 rpm, CG vs. CON) were higher in CG than CON (P < 0.05). SV was higher at 15, 30 and 45 min (P < 0.05), CO was higher at 5 and 45 min (P < 0.05), HR was lower at 15 and 30 min (P < 0.05) and [BLa-] was lower at 5 and 15 min (P < 0.05) during passive recovery, while LMS was lower at all time-points (P < 0.05) compared with CON. CONCLUSION Sports CG improves subsequent cycling performance by enhancing hemodynamic responses and attenuating perceived muscle soreness during passive recovery in physically active men.
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Affiliation(s)
- Daniel C W Lee
- Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Shatin, Hong Kong.,Elite Training Science and Technology Division, Hong Kong Sports Institute, Shatin, Hong Kong
| | - Sinead Sheridan
- Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Ajmol Ali
- Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Shatin, Hong Kong.,School of Sport, Exercise and Nutrition, Massey University, Palmerston North, New Zealand
| | - Damien Sutanto
- Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Shatin, Hong Kong
| | - Stephen H S Wong
- Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Shatin, Hong Kong.
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18
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Okano S, Nishizawa H, Yui J, Yokokawa Y, Koinuma M, Nakamura A. Convergent validity of a simplified device and relationship between blood lactate and salivary lactate after a vertical squat jump in healthy non-athletes. J Phys Ther Sci 2021; 33:187-193. [PMID: 33814702 PMCID: PMC8012186 DOI: 10.1589/jpts.33.187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 12/01/2020] [Indexed: 11/28/2022] Open
Abstract
[Purpose] The aims of this study were 1) to examine the convergent validity between
Lactate pro 2 and a standard JCA-BM 8000 automatic analyzer using salivary lactate and 2)
to investigate the relationship between blood and salivary lactate levels after a vertical
squat jump. [Participants and Methods] Healthy non-athletes participated in this
observational study. The participants performed a vertical squat jump for 1 min 30 s.
Blood and salivary lactate levels were measured before and after exercise using Lactate
Pro 2. [Results] The intraclass correlation coefficient between Lactate Pro 2 and the
JCA-BM 8000 automatic analyzer was 0.773, which can be considered as substantial
convergent validity. However, in some samples, the salivary lactate level was out of the
measurable range, and numerical values could not be obtained. The cross-correlation
function between the blood and salivary lactate levels was 0.535 at lag 0 and 0.750 at lag
1, which indicated a 5-min lag between the salivary and blood lactate values. [Conclusion]
Salivary lactate levels can be easily measured using Lactate Pro 2, although its
sensitivity needs to be resolved. Further research is required for salivary lactate level,
which can be collected non-invasively, to be used as an alternative parameter to blood
lactate level.
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Affiliation(s)
- Satomi Okano
- Graduate School of Medicine, Shinshu University, Japan.,Department of Physical Therapy, Faculty of Health Sciences, Iryo Sosei University, Japan
| | - Hitomi Nishizawa
- School of Health Sciences, Faculty of Medicine, Shinshu University, Japan
| | - Joya Yui
- Graduate School of Medicine, Shinshu University, Japan
| | | | - Yoshiharu Yokokawa
- School of Health Sciences, Faculty of Medicine, Shinshu University, Japan
| | - Masayoshi Koinuma
- Center of Clinical Research, Shinshu University Hospital, Japan.,Faculty of Pharmaceutical Sciences, Teikyo Heisei University, Japan
| | - Akinori Nakamura
- Third Department of Medicine, Shinshu University School of Medicine: 3-1-1 Asahi, Matsumoto, Nagano 390-0802, Japan.,Department of Clinical Research, National Hospital Organization Matsumoto Medical Center, Japan
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19
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Ouyang GL, Lai YY, Zhong SQ, Zhu HB. [Two cases of hypoxic encephalopathy caused by simple asphyxial gas poisoning]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2020; 38:852-854. [PMID: 33287482 DOI: 10.3760/cma.j.cn121094-20191121-00538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This article analyzes the clinical manifestations and magnetic resonance imaging (MRI) data of 2 patients with hypoxic encephalopathy after simple asphyxia gas poisoning. Both patients were in a moderate coma after being poisoned, and the arterial blood lactic acid level and carbon dioxide partial pressure were higher than the normal range within 1 week after poisoning. Two patients were cured and discharged after being treated with oxygen therapy and glucocorticoids. The prognosis was good.
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Affiliation(s)
- G L Ouyang
- Department of Neurology, the First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
| | - Y Y Lai
- Department of Neurology, the First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
| | - S Q Zhong
- Department of Neurology, the First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
| | - H B Zhu
- Department of Neurology, the First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
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20
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Hsu WC, Tseng LW, Chen FC, Wang LC, Yang WW, Lin YJ, Liu C. Effects of compression garments on surface EMG and physiological responses during and after distance running. J Sport Health Sci 2020; 9:685-691. [PMID: 33308820 PMCID: PMC7749206 DOI: 10.1016/j.jshs.2017.01.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 08/19/2016] [Accepted: 10/31/2016] [Indexed: 06/09/2023]
Abstract
BACKGROUND The few previous studies that focused on the effects of compression garments (CG) on distance running performance have simultaneously measured electromyogram, physiological, and perceptual parameters. Therefore, this study investigated the effects of CG on muscle activation and median frequency during and after distance running, as well as blood-lactate concentration and rating of perceived exertion (RPE) during distance running. METHODS Eight healthy male recreational runners were recruited to randomly perform two 40 min treadmill running trials, one with CG, and the other with control garment made of normal cloth. The RPE and the surface electromyography (EMG) of 5 lower extremity muscles including gluteus maximus (GM), rectus femoris (RF), semitendinosus (ST), tibialis anterior (TA), and gastrocnemius (GAS) were measured during the running trial. The blood-lactate levels before and after the running trial were measured. RESULTS Wearing CG led to significant lower muscle activation (p < 0.05) in the GM (decreased 7.40%-14.31%), RF (decreased 4.39%-4.76%), and ST (decreased 3.42%-7.20%) muscles; moreover, significant higher median frequency (p< 0.05) in the GM (increased 5.57%) and ST (increased 10.58%) muscles. Wearing CG did not alter the RPE values or the blood-lactate levels (p > 0.05). CONCLUSION Wearing CG was associated with significantly lower muscle activation and higher median frequency in the running-related key muscles during distance running. This finding suggested that wearing CG may improve muscle function, which might enhance running performance and prevent muscle fatigue.
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Affiliation(s)
- Wei-Chun Hsu
- Graduate Institute of Biomedical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, China; National Defense Medical Center, Taipei, Taiwan 11466, China
| | - Li-Wen Tseng
- Graduate Institute of Biomedical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, China
| | - Fu-Chun Chen
- Graduate Institute of Sports Equipment Technology, University of Taipei, Taipei, Taiwan 11153, China
| | - Li-Chu Wang
- Taiwan Textile Research Institute, New Taipei City, Taiwan 23674, China
| | - Wen-Wen Yang
- Graduate Institute of Sports Equipment Technology, University of Taipei, Taipei, Taiwan 11153, China
| | - Yi-Jia Lin
- Graduate Institute of Biomedical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, China
| | - Chiang Liu
- Graduate Institute of Sports Equipment Technology, University of Taipei, Taipei, Taiwan 11153, China.
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21
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Płoszczyca K, Jazic D, Piotrowicz Z, Chalimoniuk M, Langfort J, Czuba M. Comparison of maximal lactate steady state with anaerobic threshold determined by various methods based on graded exercise test with 3-minute stages in elite cyclists. BMC Sports Sci Med Rehabil 2020; 12:70. [PMID: 33292555 PMCID: PMC7672951 DOI: 10.1186/s13102-020-00219-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 11/04/2020] [Indexed: 02/06/2023]
Abstract
Background The maximal lactate steady state (MLSS) is defined as the highest workload that can be maintained for a longer period of time without continued blood lactate (LA) accumulation. MLSS is one of the physiological indicators of aerobic performance. However, determination of MLSS requires the performance of a series of constant-intensity tests during multiple laboratory visits. Therefore, attempts are made to determine MLSS indirectly by means of anaerobic threshold (AT) evaluated during a single graded exercise test (GXT) until volitional exhaustion. The aim of our study was to verify whether AT determined by maximal deviation (Dmax), modified maximal deviation (ModDmax), baseline LA concentration + 1 mmol/l (+ 1 mmol/l), individual anaerobic threshold (IAT), onset of blood lactate accumulation (OBLA4mmol/l) and V-slope methods based on GXT with 3-min stages provide valid estimates of MLSS in elite cyclists. Methods Twelve elite male cyclists (71.3 ± 3.6 ml/kg/min) completed GXT (the increase by 40 W every 3 min) to establish the AT (by Dmax, ModDmax, + 1 mmol/l, IAT, OBLA4mmol/l and V-slope methods). Next, a series of 30-min constant-load tests to determine MLSS was performed. Agreement between the MLSS and workload (WR) at AT was evaluated using the Bland–Altman method. Results The analysis revealed a very high (rs > 0.90, p < 0.001) correlation between WRMLSS and WRDmax and WRIAT. The other AT methods were highly (rs > 0.70) correlated with MLSS except for OBLA4mmol/l (rs = 0.67). The Bland-Altman analysis revealed the highest agreement with MLSS for the Dmax, IAT and + 1 mmol/l methods. Mean difference between WRMLSS and WRDmax, WRIAT and WR+1mmol/l was 1.7 ± 3.9 W, 4.3 ± 7.9 W and 6.7 ± 17.2 W, respectively. Furthermore, the WRDmax and WRIAT had the lowest limits of agreement with the WRMLSS. The ModDmax and OBLA4mmol/l methods overestimated MLSS by 31.7 ± 18.5 W and 43.3 ± 17.8 W, respectively. The V-slope method underestimated MLSS by 36.2 ± 10.9 W. Conclusions The AT determined by Dmax and IAT methods based on the cycling GXT with 3-min stages provides a high agreement with the MLSS in elite cyclists. Despite the high correlation with MLSS and low mean difference, the AT determined by + 1 mmol/l method may highly overestimate or underestimate MLSS in individual subjects. The individual MLSS cannot be properly estimated by V-slope, ModDmax and OBLA4mmol/l methods.
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Affiliation(s)
- Kamila Płoszczyca
- Department of Kinesiology, Institute of Sport, Trylogii 2/16, 01-982, Warsaw, Poland.
| | - Dominik Jazic
- Department of Sports Theory, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland
| | - Zofia Piotrowicz
- Faculty of Health Sciences, Jan Dlugosz University, Czestochowa, Poland
| | | | - Józef Langfort
- Faculty of Health Sciences, Jan Dlugosz University, Czestochowa, Poland
| | - Miłosz Czuba
- Department of Sports Theory, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland.,Faculty of Health Sciences, Jan Dlugosz University, Czestochowa, Poland
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Kooyman GL, McDonald BI, Williams CL, Meir JU, Ponganis PJ. The aerobic dive limit: After 40 years, still rarely measured but commonly used. Comp Biochem Physiol A Mol Integr Physiol 2020; 252:110841. [PMID: 33186706 DOI: 10.1016/j.cbpa.2020.110841] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 11/04/2020] [Accepted: 11/04/2020] [Indexed: 11/15/2022]
Abstract
The aerobic dive limit (ADL) and the hypothesis that most dives are aerobic in nature have become fundamental to the understanding of diving physiology and to the interpretation of diving behavior and foraging ecology of marine mammals and seabirds. An ADL, the dive duration associated with the onset of post-dive blood lactate accumulation, has only been documented with blood lactate analyses in five species. Applications to other species have involved behavioral estimates or use of an oxygen store / metabolic rate formula. Both approaches have limitations, but have proved useful to the evaluation of the dive behavior and ecology of many species.
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Affiliation(s)
- Gerald L Kooyman
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA
| | - Birgitte I McDonald
- Moss Landing Marine Laboratories, California State University, 8272 Moss Landing Road, Moss Landing, CA 95039, USA
| | - Cassondra L Williams
- National Marine Mammal Foundation, 2240 Shelter Island Drive, #200, San Diego, CA 92106, USA
| | | | - Paul J Ponganis
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA.
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Jouffroy R, Léguillier T, Gilbert B, Tourtier JP, Bloch-Laine E, Ecollan P, Bounes V, Boularan J, Gueye-Ngalgou P, Nivet-Antoine V, Beaudeux JL, Vivien B. Prehospital lactate clearance is associated with reduced mortality in patients with septic shock. Am J Emerg Med 2021; 46:367-73. [PMID: 33097320 DOI: 10.1016/j.ajem.2020.10.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 09/28/2020] [Accepted: 10/07/2020] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Assessment of disease severity in patients with septic shock (SS) is crucial in determining optimal level of care. In both pre- and in-hospital settings, blood lactate measurement is broadly used in combination with the clinical evaluation of patients as the clinical picture alone is not sufficient for assessing disease severity and outcomes. METHODS From 15th April 2017 to 15th April 2019, patients with SS requiring prehospital mobile Intensive Care Unit intervention (mICU) were prospectively included in this observational study. Prehospital blood lactate clearance was estimated by the difference between prehospital (time of first contact between the patients and the mICU prior to any treatment) and in-hospital (at hospital admission) blood lactate levels divided by prehospital blood lactate. RESULTS Among the 185 patients included in this study, lactate measurement was missing for six (3%) in the prehospital setting and for four (2%) at hospital admission, thus 175 (95%) were analysed for prehospital blood lactate clearance (mean age 70 ± 14 years). Pulmonary, digestive and urinary infections were probably the cause of the SS in respectively 56%, 22% and 10% of the cases. The 30-day overall mortality was 32%. Mean prehospital blood lactate clearance was significantly different between patients who died and those who survived (respectively 0.41 ± 2.50 mmol.l-1 vs 1.65 ± 2.88 mmol.l-1, p = 0.007). Cox regression analysis showed that 30-day mortality was associated with prehospital blood lactate clearance > 10% (HRa [CI95] = 0.49 [0.26-0.92], p = 0.028) and prehospital blood lactate clearance < 10% (HRa [CI95] = 2.04 [1.08-3.84], p = 0.028). CONCLUSION A prehospital blood lactate clearance < 10% is associated with 30-day mortality increase in patients with SS handled by the prehospital mICU. Further studies will be needed to evaluate if prehospital blood lactate clearance alone or combined with clinical scores could affected the triage decision-making process for those patients.
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24
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Marik PE, Stephenson E. The ability of Procalcitonin, lactate, white blood cell count and neutrophil-lymphocyte count ratio to predict blood stream infection. Analysis of a large database. J Crit Care 2020; 60:135-139. [PMID: 32799183 DOI: 10.1016/j.jcrc.2020.07.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/15/2020] [Accepted: 07/26/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND The global burden of death due to sepsis is considerable. Early diagnosis is essential to improve the outcome of this deadly syndrome. Yet, the diagnosis of sepsis is fraught with difficulties. Patients with blood stream infection (BSI) are at an increased risk of complications and death. The aim of this study was to determine the diagnostic accuracy of four readily available biomarkers to diagnose BSI in patients with suspected sepsis. METHODS In this retrospective, observational, Electronic Medical Record based study we compared the accuracy of procalcitonin (PCT), serum lactate concentration, total white blood cell (WBC) count and the neutrophil-lymphocyte count ratio (NLCR) to diagnose BSI in adult patients presenting to hospital with suspected sepsis. Based on the blood culture results patients were classified into 1 of the following 5 groups: i) negative blood cultures, ii) positive for a bacterial pathogen, iii) positive for a potential pathogen, iv) fungal pathogen and v) potential contaminant. Group 2 was further divided into Gram -ve and Gram +ve pathogens. Receiver operating characteristic (ROC) curves were constructed to compare the diagnostic performance of the biomarkers. RESULTS There were 1767 discreet patient admissions. The median PCT concentration differed significantly across blood culture groups (p < 0.0001). The highest median PCT concentration was observed in patients with a Gram-negative pathogen (17.1 ng/mL; IQR 3.6-49.7) and the lowest PCT in patients with negative blood cultures (0.6 ng/mL; IQR 0.2-2.8). The AUROC was 0.83 (0.79-0.86) for PCT, 0.68 (0.64-0.72) for the NLCR, 0.55 (0.51-0.60) for lactate concentration and 0.52 (0.48-0.57) for the WBC count. The AUROC for PCT was significantly greater than that of the NLCR (p < 0.0001). A PCT less than 0.5 ng/mL had a negative predictive value of 95% for excluding BSI. The best cut-off value of PCT for predicting BSI was 1.5 ng/ml. CONCLUSION Our results suggest that PCT of less than 0.5 ng/mL may be an effective screening tool to exclude BSI as the cause of sepsis, while the diagnosis of BSI should be considered in patients with a PCT above this threshold. The total WBC count and blood lactate concentration may not be reliable biomarkers for the diagnosis of BSI. The NLCR may be a useful screening test for BSI when PCT assays are not available.
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Affiliation(s)
- Paul E Marik
- Division of Pulmonary and Critical Care Medicine, Eastern Virginia Medical School, Norfolk, VA, USA.
| | - Elise Stephenson
- Division of Pulmonary and Critical Care Medicine, Eastern Virginia Medical School, Norfolk, VA, USA
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25
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Walden TP, Girard O, Jonson AM, Dempsey AR, Marston KJ, Scott BR. Sessional work-rate does not affect the magnitude to which simulated hypoxia can augment acute physiological responses during resistance exercise. Eur J Appl Physiol 2020; 120:2159-69. [PMID: 32705392 DOI: 10.1007/s00421-020-04440-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 07/16/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE To investigate whether performing resistance exercise in hypoxia augments physiological and perceptual responses, and if altering work-rate by performing repetitions to failure compared to sub-maximally increases the magnitude of these responses. METHODS Twenty male university students (minimum of 2 year resistance training experience) completed four sessions, two in hypoxia (fraction of inspired oxygen [FiO2] = 0.13), and two in normoxia (FiO2 = 0.21). For each condition, session one comprised three sets to failure of shoulder press and bench press (high work-rate session), while session two involved the same volume load, distributed over six sets (low work-rate session). Muscle oxygenation (triceps brachii), surface electromyographic activity (anterior deltoid, pectoralis major, and triceps brachii), heart rate (HR), and arterial blood oxygen saturation were recorded. Blood lactate concentration ([Bla-]) was recorded pre-exercise and 2 min after each exercise. Muscle thickness was measured pre- and post-exercise via ultrasound. RESULTS Muscle oxygenation values during sets and inter-set rest periods were lower in hypoxia vs normoxia (p = 0.001). Hypoxia caused greater [Bla-] during the shoulder press of failure sessions (p = 0.003) and both shoulder press (p = 0.048) and bench press (p = 0.005) of non-failure sessions. Hypoxia increased HR during non-failure sessions (p < 0.001). There was no effect of hypoxia on muscular swelling, surface electromyographic activity, perceived exertion, or number of repetitions performed. CONCLUSIONS Hypoxia augmented metabolite accumulation, but had no impact on any other physiological or perceptual response compared to the equivalent exercise in normoxia. Furthermore, the magnitude to which hypoxia increased the measured physiological responses was not influenced by sessional work-rate.
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26
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Rezaei S, Akbari K, Gahreman DE, Sarshin A, Tabben M, Kaviani M, Sadeghinikoo A, Koozehchian MS, Naderi A. Caffeine and sodium bicarbonate supplementation alone or together improve karate performance. J Int Soc Sports Nutr 2019; 16:44. [PMID: 31623659 PMCID: PMC6798418 DOI: 10.1186/s12970-019-0313-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 09/25/2019] [Indexed: 11/28/2022] Open
Abstract
Background The ergogenic properties of acute caffeine (CAF) and sodium bicarbonate (NaHCO3) ingestion on athletic performance have been previously investigated. However, each sport has unique physiological and technical characteristics which warrants optimizing supplementations strategies for maximizing performance. This study examined the effects of CAF and NaHCO3 ingestion on physiological responses and rate of perceived exertion during a Karate-specific aerobic test (KSAT) in competitive karatekas. Methods In a double-blind, crossover, randomized placebo-controlled trial, eight Karatekas underwent five experimental conditions including control (CON), placebo (PLA), CAF, NaHCO3, and CAF + NaHCO3 before completing KSAT. Capsules containing 6 mg/kg BW CAF were consumed 50 min prior to a KSAT whilst 0.3 g/kg BW NaHCO3 was consumed for 3 days leading to and 120, 90, and 60 min prior to a KSAT. Time to exhaustion (TTE), rate of perceived exertion (RPE), and blood lactate (BL) were measured before, immediately after and 3 min following KSAT. Results TTE was significantly greater following CAF, NaHCO3, and CAF + NaHCO3 consumption compared to PLA and CON. However, the differences between CAF, NaHCO3, and CAF + NaHCO3 were not statistically significant (p > 0.05). BL increased significantly from baseline to immediately after and 3 min following KSAT in all conditions (p < 0.01), while RPE at the end of KSAT was not significantly different between conditions (p = 0.11). Conclusions Karate practitioners may benefit from the ergogenic effects of CAF and NaHCO3 when consumed separately or together.
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Affiliation(s)
- Sajjad Rezaei
- Physical Education and Sport Sciences Department, Faculty of Humanities, Tarbiat Modares University, Tehran, Iran
| | - Kazem Akbari
- Department of exercise physiology, Faculty of Physical education and sport sciences, Kharazmi University, Tehran, Iran. .,Raad Sports Club, Tehran, Iran.
| | - Daniel E Gahreman
- College of Health and Human Sciences, Charles Darwin University, Darwin, Australia
| | - Amir Sarshin
- Faculty of Physical education and sport sciences, Department of Exercise Physiology, Karaj Branch, Islamic Azad University, Karaj, Iran
| | - Montassar Tabben
- Aspetar, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar
| | - Mojtaba Kaviani
- School of Nutrition and Dietetics, Acadia University, Wolfville, Nova Scotia, Canada
| | | | - Majid S Koozehchian
- Department of Kinesiology, Jacksonville State University, Jacksonville, AL, 36265, USA
| | - Alireza Naderi
- Sports Physiology Department, Islamic Azad University, Boroujerd Branch, Boroujerd, Iran
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27
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Jouffroy R, Tourtier JP, Debaty G, Bounes V, Gueye-Ngalgou P, Vivien B. Contribution of the Pre-Hospital Blood Lactate Level in the Pre-Hospital Orientation of Septic Shock: The LAPHSUS Study. Turk J Anaesthesiol Reanim 2019; 48:58-61. [PMID: 32076681 PMCID: PMC7001804 DOI: 10.5152/tjar.2019.42027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 02/08/2019] [Indexed: 11/23/2022] Open
Abstract
Objective In the pre-hospital setting, the assessment of septic shock severity is essential when determining the optimal initial in-hospital level of care. As clinical signs can be faulted, there is a need for an additional component to enhance the severity assessment and to decide on in-hospital admission in the intensive care unit (ICU) or in the emergency department (ED). Point-of-care medical devices by yielding blood lactate value since the pre-hospital setting may give an easy and valuable component for the severity assessment and decision-making. The aim of this study is to provide clinical evidence that the pre-hospital blood lactate level predicts the 30-day mortality in patients with septic shock. Methods This trial is a prospective, observational, non-randomised controlled study. A total of 1,000 patients requiring a mobile ICU intervention for septic shock in the pre-hospital setting will be included. Pre-hospital blood lactate levels will not be taken into account to decide patients’ treatments and/or ED or ICU admission. In the pre-hospital setting, each patient will benefit from two measurements of the blood lactate level: initial measurement at the first contact, and final measurement at the hospital admission with a specific point-of-care medical device. Conclusion This study could provide clinical evidence that the pre-hospital blood lactate level predicts the 30-day mortality of patients with septic shock. The results from this study could also prove the utility of the pre-hospital blood lactate level for the triage and early orientation of patients with septic shock.
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Affiliation(s)
- Romain Jouffroy
- Intensive Care Unit, Anesthesiology, SAMU, Necker Enfants Malades Hospital, Assistance Publique - Hôpitaux de Paris, Paris, France
| | | | - Guillaume Debaty
- Department of Emergency Medicine, SAMU 38, University Hospital of Grenoble Alps/CNRS/TIMC-IMAG UMR 5525, Grenoble, France
| | - Vincent Bounes
- Department of Emergency Medicine, SAMU 31, University Hospital of Toulouse, Toulouse, France
| | - Papa Gueye-Ngalgou
- SAMU 972 CHU de Martinique Pierre Zobda-Quitman Hospital 97261 Fort-de-France Martinique, France
| | - Benoit Vivien
- Intensive Care Unit, Anesthesiology, SAMU, Necker Enfants Malades Hospital, Assistance Publique - Hôpitaux de Paris, Paris, France
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28
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Cunha VCR, Aoki MS, Zourdos MC, Gomes RV, Barbosa WP, Massa M, Moreira A, Capitani CD. Sodium citrate supplementation enhances tennis skill performance: a crossover, placebo-controlled, double blind study. J Int Soc Sports Nutr 2019; 16:32. [PMID: 31370896 PMCID: PMC6676531 DOI: 10.1186/s12970-019-0297-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 07/08/2019] [Indexed: 11/25/2022] Open
Abstract
Background The efficacy of sodium citrate supplementation (SC) in exercise performance is unclear. Therefore, the aim of this study was to investigate the effect of SC on skilled tennis performance. Methods Ten Brazilian nationally-ranked young male tennis players (age: 17 ± 1 yrs.; stature: 176.7 ± 5.2 cm; body mass: 68.4 ± 7.9 kg) participated in this crossover, placebo-controlled, double-blind study. Upon arrival, at baseline, in both experimental sessions blood was collected, then subjects ingested either sodium citrate (SC - 0.5 g.kg−1BM in capsules of 500 mg) or a placebo (PLA). Two hours later, pre-match blood was collected then skills tests (skill tennis performance test - STPT, repeated-sprint ability shuttle test - RSA) were performed followed by a 1-h simulated match. Immediately following the match, blood was again collected, and STPT, and RSA were administered. Results All metabolic parameters (i.e. base excess, pH, bicarbonate, and blood lactate) increased (p < 0.001) from baseline to pre-match and post-match in SC condition. Each metabolic parameter was greater (p < 0.001) in SC compared to PLA condition at both pre- and post-match. The SC condition elicited a greater (p < 0.01) shot consistency at post-match in the STPT vs. PLA condition (SC: 58.5 ± 14.8% vs. PLA: 40.4 ± 10.4%). A greater (p < 0.001) amount of games won was observed in the simulated match for SC condition vs. PLA condition (SC: 8.0 ± 1.6 vs. PLA: 6.0 ± 1.7). Additionally, the games won during the simulated match in SC condition was positively correlated with percentage shot consistency (r = 0.67, p < 0.001). Conclusions The current findings suggest that SC supplementation is an effective ergogenic aid to enhance skilled tennis performance.
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Affiliation(s)
- Vivian C R Cunha
- School of Applied Sciences, University of Campinas, Rua Pedro Zaccaria 1300, Limeira, 13484-350, Sao Paulo, Brazil
| | - Marcelo S Aoki
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Michael C Zourdos
- Department of Exercise Science and Health Promotion, Muscle Physiology Laboratory, Florida Atlantic University, Kissimme, Florida, USA
| | - Rodrigo V Gomes
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Wesley P Barbosa
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Marcelo Massa
- School of Arts, Sciences and Humanities, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Alexandre Moreira
- School of Physical Education and Sport, University of Sao Paulo, Sao Paulo, Sao Paulo, Brazil
| | - Caroline D Capitani
- School of Applied Sciences, University of Campinas, Rua Pedro Zaccaria 1300, Limeira, 13484-350, Sao Paulo, Brazil.
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29
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McKean CC, Baiamonte BA, Kraemer RR, Hollander DB. Attention-deficit/hyperactivity disorder medication does not alter exercise-induced hypoalgesia following an acute bout of dynamic circuit resistance exercise. Biol Sport 2018; 35:321-7. [PMID: 30765916 DOI: 10.5114/biolsport.2018.77837] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 03/14/2018] [Accepted: 04/18/2018] [Indexed: 02/07/2023] Open
Abstract
The primary goal of this study was to investigate the effects of attention-deficit/hyperactivity disorder (ADHD) medications on exercise-induced hypoalgesia (EIH), heart rate, and perceived exertion. Thirty college-age students (10 Controls, 10 ADHD diagnosis, and 10 ADHD diagnosis with medications) completed 2 sessions: 1) a maximal testing session and 2) an experimental session consisting of 3 consecutive dynamic resistance exercise circuits comprised of 12 repetitions of 9 exercises at 60% of 1-repetition maximum using a 1:1 work to rest ratio. All participants, regardless of condition (Controls vs. ADHD without medications vs. ADHD with medications), displayed EIH accompanied by an increase in blood lactate, heart rate, and perceived exertion for the duration of the exercise bout. Therefore, the effects of resistance exercise are not altered by ADHD diagnosis or psychostimulant medication use for ADHD. These findings are intriguing given the known ergogenic and hypoalgesic effects of caffeine, a less potent stimulant.
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Olea E, Gonzalez-Obeso E, Agapito T, Obeso A, Rigual R, Rocher A, Gomez-Niño A. Adrenal Medulla Chemo Sensitivity Does Not Compensate the Lack of Hypoxia Driven Carotid Body Chemo Reflex in Guinea Pigs. Adv Exp Med Biol 2018; 1071:167-74. [PMID: 30357748 DOI: 10.1007/978-3-319-91137-3_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register]
Abstract
Guinea pigs (GP), originally from the Andes, have absence of hypoxia-driven carotid body (CB) reflex. Neonatal mammals have an immature CB chemo reflex and respond to hypoxia with metabolic changes arising from direct effects of hypoxia on adrenal medulla (AM). Our working hypothesis is that adult GP would mimic neonatal mammals. Plasma epinephrine (E) has an AM origin, while norepinephrine (NE) is mainly originated in sympathetic endings, implying that specific GP changes in plasma E/NE ratio, and in blood glucose and lactate levels during hypoxia would be observed. Experiments were performed on young adult GP and rats. Hypoxic ventilation (10% O2) increased E and NE plasma levels similarly in both species but PaO2 was lower in GP than in rats. Plasma E/NE ratio in GP was higher (≈1.0) than in rats (≈0.5). The hypoxia-evoked increases in blood glucose and lactate were smaller in GP than in the rat. The AM of both species contain comparable E content, but NE was four times lower in GP than in rats. GP superior cervical ganglion also had lower NE content than rats and an unusual high level of dopamine, a negative modulator of sympathetic transmission. Isolated AM from GP released half of E and one tenth of NE than the rat AM, and hypoxia did not alter the time course of CA outflow. These data indicate the absence of direct effects of hypoxia on AM in the GP, and a lower noradrenergic tone in this species. Pathways for hypoxic sympatho-adrenal system activation in GP are discussed.
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Kimura T, Kaneko F, Iwamoto E, Saitoh S, Yamada T. Neuromuscular electrical stimulation increases serum brain-derived neurotrophic factor in humans. Exp Brain Res 2018; 237:47-56. [PMID: 30306243 DOI: 10.1007/s00221-018-5396-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 10/04/2018] [Indexed: 01/05/2023]
Abstract
Brain-derived neurotrophic factor (BDNF) plays several important roles in nervous system function including neuronal growth and plasticity. The purpose of the present study was to clarify whether neuromuscular electrical stimulation (NMES) and voluntary exercise to the same integrated force as by the NMES-induced exercise would enhance serum BDNF. Eleven healthy male subjects completed three interventions (NMES, voluntary exercise, and resting interventions) for 20 min on different days. In the NMES intervention, NMES was applied to the quadriceps femoris muscles. The stimulus intensity of NMES was progressively increased to the highest tolerated intensity during the experiment. In the voluntary exercise intervention, subjects performed an isometric knee-extension task; in this intervention, the target torque was calculated in accordance with the integrated force of knee extension obtained during the NMES intervention. In the resting intervention, subjects relaxed in a sitting posture. We measured serum BDNF, blood lactate, heart rate, oxygen uptake, respiratory ratio, and blood pressure. Serum BDNF was increased in the NMES (p = 0.003) and voluntary exercise interventions (p = 0.004) after each intervention. At the post-timepoint, serum BDNF in the NMES intervention was highest among all interventions (p = 0.038) and significantly higher than in the voluntary exercise (p = 0.036) and resting (p = 0.037) interventions. Our results showed that NMES was more effective for enhancing serum BDNF than voluntary exercise at least when employing the same method and integrated force.
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Affiliation(s)
- Takehide Kimura
- Graduate School of Health Sciences, Sapporo Medical University, W17-S1 Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan.,Shinoro Orthopedic Hospital, Shinoro 4-5-3-9, Kita-ku, Sapporo, 002-8024, Hokkaido, Japan.,Department of Physical Therapy, Faculty of Health Sciences, Tsukuba International University, 6-8-33 Manabe, Tsuchiura, 300-0051, Ibaraki, Japan
| | - Fuminari Kaneko
- First Division of Physical Therapy, School of Health Sciences, Sapporo Medical University, W17-S1 Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan. .,Department of Rehabilitation Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan. .,Shonan Keiiku Hospital, 4360 Endo, Fujisawa, Kanagawa, 252-0816, Japan.
| | - Erika Iwamoto
- Second Division of Physical Therapy, School of Health Sciences, Sapporo Medical University, W17-S1 Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan
| | - Shigeyuki Saitoh
- Department of Nursing, School of Health Sciences, Sapporo Medical University, W17-S1 Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan.,Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University, W17-S1 Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan
| | - Takashi Yamada
- First Division of Physical Therapy, School of Health Sciences, Sapporo Medical University, W17-S1 Chuo-ku, Sapporo, Hokkaido, 060-8556, Japan
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Mezzaroba PV, Pessôa Filho DM, Zagatto AM, Machado FA. LED session prior incremental step test enhance VO 2max in running. Lasers Med Sci 2018; 33:1263-1270. [PMID: 29546618 DOI: 10.1007/s10103-018-2475-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 02/26/2018] [Indexed: 01/06/2023]
Abstract
This study aimed to investigate the effect of prior LED sessions on the responses of cardiorespiratory parameters during the running incremental step test. Twenty-six healthy, physically active, young men, aged between 20 and 30 years, took part in this study. Participants performed two incremental load tests after placebo (PLA) and light-emitting diode application (LED), and had their gas exchange, heart rate (HR), blood lactate, and rating of perceived exertion (RPE) monitored during all tests. The PLA and LED conditions were compared using the dependent Student t test with significance set at 5%. The T test showed higher maximum oxygen uptake (VO2max) (PLA = 47.2 ± 5.7; LED = 48.0 ± 5.4 ml kg-1 min-1, trivial effect size), peak velocity (Vpeak) (PLA = 13.4 ± 1.2; LED = 13.6 ± 1.2 km h-1, trivial effect size), and lower maximum HR (PLA = 195.3 ± 3.4; LED = 193.3 ± 3.9 b min-1, moderate effect size) for LED compared to PLA conditions. Furthermore, submaximal values of HR and RPE were lower, and submaximal VO2 values were higher when LED sessions prior to the incremental step test were applied. A positive response of the previous LED application in the blood lactate disappearance was also demonstrated, especially 13 and 15 min after the test. It is concluded that LED sessions prior to exercise modify cardiorespiratory response by affecting running tolerance during the incremental step test, metabolite clearance, and RPE. Therefore, LED could be used as a prior exercise strategy to modulate oxidative response acutely in targeted muscle and enhance exercise tolerance.
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Affiliation(s)
- Paulo V Mezzaroba
- Department of Physical Education, State University of Maringá (UEM), Colombo Avenue, 5790, Maringá, PR, 87.020-900, Brazil
| | - Dalton M Pessôa Filho
- Department of Physical Education, Paulista State University Julio de Mesquita Filho (UNESP), Bauro, Brazil
| | - Alessandro M Zagatto
- Department of Physical Education, Paulista State University Julio de Mesquita Filho (UNESP), Bauro, Brazil
| | - Fabiana Andrade Machado
- Department of Physical Education, State University of Maringá (UEM), Colombo Avenue, 5790, Maringá, PR, 87.020-900, Brazil.
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Pellegrino FJ, Risso A, Vaquero PG, Corrada YA. Physiological parameter values in greyhounds before and after high-intensity exercise. Open Vet J 2018; 8:64-67. [PMID: 29721434 PMCID: PMC5918126 DOI: 10.4314/ovj.v8i1.11] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 02/19/2018] [Indexed: 11/17/2022] Open
Abstract
Dog sports competitions have greatly expanded. The availability of reference values for each type of activity could help assess fitness accurately. Heart rate (HR), blood lactate (BL) and rectal temperature (RT) are relevant physiological parameters to determine the dogs response to effort. Previous studies in greyhounds have reported the effect of high-intensity exercise on many physiological parameters immediately after completing different racing distances and recovery times. However, there are no studies concerning physiological changes over shorter racing distances. We therefore assessed the effect of sprint exercise on HR, BL and RT in nine greyhounds performing sprint exercise over a 100-m distance chasing a lure. After the exercise, dogs underwent a passive 10-min recovery phase. Before the exercise, immediately after it and at 5 and 10 min during recovery, HR and RT were assessed and blood samples were collected for BL determination. HR, BL and RT values increased significantly after the exercise (P<0.01). Whereas HR returned to pre-exercise values at 10 min during the recovery phase (P>0.1), BL concentration and RT remained increased (P<0.01). The abrupt increase in HR, BL and RT values observed immediately after the exercise indicates the high intensity of the effort performed. Similarly, BL concentration after the exercise exceeded the 4 mmol/L lactate threshold, suggesting a predominant anaerobic metabolism during effort. Although HR returned to pre-exercise values 10 min after the exercise, a more extensive recovery phase would be necessary for a total return to resting values, particularly for BL and RT. In greyhounds subjected to high-intensity exercise, HR, BL and RT were reliable physiological parameters to accurately assess the physiological response to effort. The use of sprint exercises over short racing distances could be useful for appropriately monitoring fitness in sporting dogs.
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Affiliation(s)
- Francisco Javier Pellegrino
- LAFIVET - Laboratorio de Fisioterapia Veterinaria, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, 60 y 118 (1900) La Plata, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, (CONICET LA PLATA), 8 Nº 1467, La Plata, Argentina.,IGEVET - Instituto de Genética Veterinaria (UNLP-CONICET LA PLATA), 60 y 118 (1900) La Plata, Argentina
| | - Analía Risso
- LAFIVET - Laboratorio de Fisioterapia Veterinaria, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, 60 y 118 (1900) La Plata, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, (CONICET LA PLATA), 8 Nº 1467, La Plata, Argentina.,IGEVET - Instituto de Genética Veterinaria (UNLP-CONICET LA PLATA), 60 y 118 (1900) La Plata, Argentina
| | - Pablo G Vaquero
- Facultad de Ciencias Veterinarias, Universidad Nacional de La Pampa (UNLPam), 5 esq. 116 (6360), General Pico, La Pampa, Argentina
| | - Yanina A Corrada
- LAFIVET - Laboratorio de Fisioterapia Veterinaria, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, 60 y 118 (1900) La Plata, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas, (CONICET LA PLATA), 8 Nº 1467, La Plata, Argentina
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Kiyici F, Eroğlu H, Kishali NF, Burmaoglu G. The Effect of Citrulline/Malate on Blood Lactate Levels in Intensive Exercise. Biochem Genet 2017; 55:387-394. [PMID: 28664349 DOI: 10.1007/s10528-017-9807-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 06/14/2017] [Indexed: 12/30/2022]
Abstract
The purpose of this study was to examine the effects of Citrulline/Malate supplementation with intensive training on blood lactate level in active handball players. The athletes were subjected to intense training for 4 weeks, 4 days a week, mainly pre-season strength and technique training. In this training period, stimol group (n = 11) athletes were given stimol 3 times a day as 1 g for breakfast, 1 g for lunch, and 1 g for dinner while the placebo group (n = 11) athletes were given only placebo in the same dosage and the same color at the same time. Blood lactate levels in athletes were measured 4 times, prior to and after a 1-month program as follows: rest (R), end effort (EE), recuperation 5 min (R5 m), and recuperation 20 min (R20 m). Blood lactate levels were compared both as intra-group and between the groups. In intra-group comparison, no change was observed in blood lactate levels in placebo group while a significant difference was found in the levels of stimol group as p < 0.05 with a 49.8% decrease in blood lactate level. In the measurements between groups, in the post-test measurements made after the training period, significant differences as p < 0.05 were found with a 60.7% decrease in blood lactate level EE. Considerable decline was seen especially immediately after exercise in blood lactate levels of the athletes being given stimol supplement. In this case, we can say that Citrulline/Malate supplementation may contribute positively to the performance of athletes and may help postpone fatigue at excessive or prolonged activity.
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Affiliation(s)
- Fatih Kiyici
- Faculty of Sport Sciences, Ataturk University, 25240, Erzurum, Turkey.
| | - Hüseyin Eroğlu
- Department of Physical Education and Sport, Kahramanmaraş Sütcü Imam University, Kahramanmaraş, Turkey
| | - N Fazil Kishali
- Faculty of Sport Sciences, Ataturk University, 25240, Erzurum, Turkey
| | - Guleda Burmaoglu
- Faculty of Sport Sciences, Ataturk University, 25240, Erzurum, Turkey
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DIEBEL SEBASTIANR, NEWHOUSE IAN, THOMPSON DAVIDS, JOHNSON VINEETB. The Effects of a 10-day Altitude Training Camp at 1828 Meters on Varsity Cross-Country Runners. Int J Exerc Sci 2017; 10:97-107. [PMID: 28479950 PMCID: PMC5213424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Altitude training has been shown to alter blood lactate (BL) levels due to alterations resulting from acclimatization. This study aims to estimate the impact of altitude training on BL changes immediately following an incremental treadmill test and during recovery before and after 10-day altitude training at approximately 1828 meters. Eight varsity cross-country runners performed an incremental treadmill test (ITT), pre and post-altitude training. Resting and post-warm-up BL values were recorded. During ITT, heart rate (HR), oxygen saturation (SpO2), and time to exhaustion were monitored. BL was also measured post-ITT at 0, 2, 4, 6, and 8 minutes. The average of all BL values was higher following altitude intervention (8.8 ± 4.6 mmol/L) compared to pre-intervention (7.4 ± 3.3 mmol/L). These differences were statistically significant (t(6) = -2.40, p = .026). BL immediately (0 minutes) after the ITT was higher following the altitude intervention (13.6 ± 3.6 mmol/L) compared to pre-intervention (9.7 ± 3.8 mmol/L) and was statistically significant (t(7) = -3.30, p = .006). Average HR during the ITT was lower following the altitude intervention (176.9 ± 11.1 bpm) compared to pre (187 ± 9.5 bpm), these differences were statistically significant (t(28)= 18.07, p= <.001. Time to exhaustion was longer after the intervention, however was not statistically significant p = 0.13. These findings indicate that a 10 - day altitude intervention at 1828 meters may benefit varsity cross-country runners. The higher post-exercise BL may be attributed to more anaerobic contributions. Lower HR may suggest a larger stroke volume and/or more efficient O2 carrying capacity.
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Affiliation(s)
| | - IAN NEWHOUSE
- School of Kinesiology, Lakehead University, Thunder Bay, ON, Canada
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Erfantalab P, Soltaninejad K, Shadnia S, Zamani N, Hassanian-Moghaddam H, Mahdavinejad A, Damaneh BH. Trend of blood lactate level in acute aluminum phosphide poisoning. World J Emerg Med 2017; 8:116-120. [PMID: 28458755 DOI: 10.5847/wjem.j.1920-8642.2017.02.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Aluminum phosphide (AlP) poisoning is common in the developing countries. There is no specific antidote for the treatment of acute AlP poisoning. Early diagnosis of poisoning and outcome predictors may facilitate treatment decisions. The objective of this study was to determine the trend of blood lactate level in acute AlP poisoning to evaluate its role as a prognostic factor. METHODS This was a prospective study on acute AlP intoxicated patients during one year. Demographic data, clinical and laboratory data on admission, and outcome were recorded in a self-made questionnaire. Blood lactate levels were analyzed every two hours for 24 hours. RESULTS Thirty-nine (27 male, 12 female) patients were included in the study. The mortality rate was 38.5%. The mean blood pressure, pulse rate, blood pH and serum bicarbonate level were significantly different between the survivors and non-survivors groups. Blood lactate level was significantly higher in the non-survivors group during 8 to 16 hours post ingestion. CONCLUSION Blood lactate level could be used as an index of severity of acute AlP poisoning.
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Affiliation(s)
- Peyman Erfantalab
- Toxicological Research Center, Excellent Center of Clinical Toxicology, Department of Clinical Toxicology, Loghman Hakim Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kambiz Soltaninejad
- Department of Forensic Toxicology, Legal Medicine Research Center, Legal Medicine Organization, Tehran, Iran
| | - Shahin Shadnia
- Toxicological Research Center, Excellent Center of Clinical Toxicology, Department of Clinical Toxicology, Loghman Hakim Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nasim Zamani
- Toxicological Research Center, Excellent Center of Clinical Toxicology, Department of Clinical Toxicology, Loghman Hakim Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hossein Hassanian-Moghaddam
- Toxicological Research Center, Excellent Center of Clinical Toxicology, Department of Clinical Toxicology, Loghman Hakim Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Arezou Mahdavinejad
- Toxicological Research Center, Excellent Center of Clinical Toxicology, Department of Clinical Toxicology, Loghman Hakim Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Behrooz Hashemi Damaneh
- Toxicological Research Center, Excellent Center of Clinical Toxicology, Department of Clinical Toxicology, Loghman Hakim Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Moscatelli F, Valenzano A, Petito A, Triggiani AI, Ciliberti MAP, Luongo L, Carotenuto M, Esposito M, Messina A, Monda V, Monda M, Capranica L, Messina G, Cibelli G. Relationship between blood lactate and cortical excitability between taekwondo athletes and non-athletes after hand-grip exercise. Somatosens Mot Res 2016; 33:137-44. [PMID: 27412765 DOI: 10.1080/08990220.2016.1203305] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES In taekwondo competitions, fatigue has a large influence on performance. Recent studies have reported that the excitability in the primary hand motor cortex, investigated with transcranial magnetic stimulation (TMS), is enhanced at the end of a maximal exercise and that this improvement correlates with blood lactate. The aim of the present study was to investigate the relationship between blood lactate and cortical excitability in taekwondo athletes and non-athletes. METHODS The excitability of the primary motor cortex was measured before and after fatiguing hand-grip exercise by TMS. Capillary blood lactate was measured at rest (pre-test), at the end (0 min), and at 3 and 10 min after the exercise by using a "Lactate Pro" portable lactate analyzer. RESULTS Significant differences in cortical excitability between the two groups were found after the exercise (p < 0.05). Furthermore, we found a significant relationship between cortical excitability and blood lactate (p < 0.01). CONCLUSION The present findings showed changes in the excitability in the athletes group and also in the non-athletes group. However, blood lactate seems to have the greater effect in trained subjects compared to untrained subjects. In fact, it appears that, during extremely intensive exercise in taekwondo athletes, lactate may delay the onset of fatigue not only by maintaining the excitability of muscle, but also by increasing the excitability of the primary motor cortex more than in non-athletes.
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Affiliation(s)
- Fiorenzo Moscatelli
- a Department of Clinical and Experimental Medicine , University of Foggia , Foggia , Italy ;,b Department of Motor, Human and Health Science , University of Rome, "Foro Italico" , Rome , Italy
| | - Anna Valenzano
- a Department of Clinical and Experimental Medicine , University of Foggia , Foggia , Italy
| | - Annamaria Petito
- a Department of Clinical and Experimental Medicine , University of Foggia , Foggia , Italy
| | | | | | - Livio Luongo
- c Department of Experimental Medicine , Second University of Naples , Naples , Italy
| | - Marco Carotenuto
- d Clinic of Child and Adolescent Neuropsychiatry, Department of Mental, Physical Health and Preventive Medicine , Second University of Naples , Naples , Italy
| | - Maria Esposito
- d Clinic of Child and Adolescent Neuropsychiatry, Department of Mental, Physical Health and Preventive Medicine , Second University of Naples , Naples , Italy
| | - Antonietta Messina
- c Department of Experimental Medicine , Second University of Naples , Naples , Italy
| | - Vincenzo Monda
- c Department of Experimental Medicine , Second University of Naples , Naples , Italy
| | - Marcellino Monda
- c Department of Experimental Medicine , Second University of Naples , Naples , Italy
| | - Laura Capranica
- b Department of Motor, Human and Health Science , University of Rome, "Foro Italico" , Rome , Italy
| | - Giovanni Messina
- a Department of Clinical and Experimental Medicine , University of Foggia , Foggia , Italy ;,c Department of Experimental Medicine , Second University of Naples , Naples , Italy
| | - Giuseppe Cibelli
- a Department of Clinical and Experimental Medicine , University of Foggia , Foggia , Italy
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Selmi MA, Haj SR, Haj YM, Moalla W, Elloumi M. Effect of between-set recovery durations on repeated sprint ability in young soccer players. Biol Sport 2016; 33:165-72. [PMID: 27274110 PMCID: PMC4885628 DOI: 10.5604/20831862.1198636] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2014] [Revised: 08/23/2014] [Accepted: 03/03/2015] [Indexed: 12/04/2022] Open
Abstract
The purposes of this study were to examine the effect of between-set recovery duration on physiological responses (heart rate and blood lactate), rating of perceived exertion (RPE) and performance indices of repeated sprint sets (RSS) and to investigate their relationship with aerobic power. Twenty-four young male soccer players (age: 17.4 ± 0.32 years) performed three randomized RSS protocols consisting of 2 sets of 5x20 m with 15 s recovery between sprints and 1 min (RSS1), 2 min (RSS2) and 4 min (RSS4) between sets, and a multi-stage aerobic track test to estimate VO2max. Results showed that in contrast to RSS2 and RSS4, RSS1 leads to a large decline in performance expressed as the sum of sprint times (34.0±1.0 s, 34.0±1.1s and 34.6±1.1s, respectively) and a significant increase of both mean heart rate (124.0±9.7 bpm, 112.5±6.7 bpm and 137.3±12.4, respectively) and RPE (3.2±1.5, 3.4±1.2 and 6.3±1.4, respectively) with no change in blood lactate and peak HR between the three rest conditions. No significant correlations were obtained between estimated VO2max and any of the indices of the three RSS protocols. In conclusion, 1 min of recovery between sets is sufficient to ensure a significant decrease in performance in the second set, while 2 min and 4 min of recovery were long enough to provide maintenance of high intensity work in the second set. These findings would be useful for coaches and sport scientists when attempting to assess repeated sprint abilities, allowing coaches to accurately define the intended training goals in young soccer players.
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Affiliation(s)
- M A Selmi
- Research Unit ''School and University Sportive Practices and Performance'', High Institute of Sports and Physical Education, Kef, University of Jendouba, Tunisia
| | - Sassi R Haj
- Research Unit ''School and University Sportive Practices and Performance'', High Institute of Sports and Physical Education, Kef, University of Jendouba, Tunisia
| | - Yahmed M Haj
- Research Unit ''Analysis and Evaluation of Factors Affecting the Sports Performance'', High Institute of Sports and Physical Education, Ksar Said, University of Manouba, Tunisia
| | - W Moalla
- Research Unit ''EM2S'', High Institute of Sports and Physical Education, Sfax, University of Sfax, Tunisia
| | - M Elloumi
- Laboratory ''Cardio-circulatory, Respiratory, and Hormonal Adaptations to Muscular Exercise'', Faculty of Medicine Ibn El Jazzar, University of Sousse, Sousse, Tunisia
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Bazzano M, Giudice E, Rizzo M, Congiu F, Zumbo A, Arfuso F, Di Pietro S, Bruschetta D, Piccione G. Application of a combined global positioning and heart rate monitoring system in jumper horses during an official competition - A preliminary study. Acta Vet Hung 2016; 64:189-200. [PMID: 27342090 DOI: 10.1556/004.2016.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of this study was to investigate whether a combined global positioning system (GPS)/heart rate (HR) monitoring system is a valuable tool to assess, step by step, the physiological response of HR and its relationship with speed in healthy horses competing in an official show jumping class. Six mares performing a standardised warm-up and jumping course were monitored using a HR/GPS device. Venous blood lactate (BL), assessed before and after exercise, showed a significant increase (P = 0.0004) following the physical effort. One-way analysis of variance (ANOVA) showed significant changes in HR throughout the experimental period. The analysis of HR data recorded during the warm-up jumping stage showed significantly higher HR (P = 0.001) in the recovery period compared to the related jumping phase. Shifting the fence height from 100 cm to 125 cm during the warm-up jumps was also found to cause a significant increase (P = 0.016) in HR. According to these preliminary results, the simultaneous logging of heart rate and speed has the potential to be a reliable and powerful technique for field testing that can help in the monitoring of the horse's response to jumping effort during training and competition.
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Affiliation(s)
- Marilena Bazzano
- 1Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
| | - Elisabetta Giudice
- 2Department of Biological and Environmental Sciences, University of Messina, S. Agata-Messina, Italy
| | - Maria Rizzo
- 1Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
| | - Fulvio Congiu
- 1Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
| | - Alessandro Zumbo
- 1Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
| | - Francesca Arfuso
- 1Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
| | - Simona Di Pietro
- 1Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
| | - Daniele Bruschetta
- 3Department of Biomedical Sciences and Morpho-functional Imaging, University of Messina, Messina, Italy
| | - Giuseppe Piccione
- 1Department of Veterinary Sciences, University of Messina, Polo Universitario dell’Annunziata, 98168 Messina, Italy
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Mears SA, Watson P, Shirreffs SM. Thirst responses following high intensity intermittent exercise when access to ad libitum water intake was permitted, not permitted or delayed. Physiol Behav 2016; 157:47-54. [PMID: 26805724 DOI: 10.1016/j.physbeh.2016.01.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 01/11/2016] [Accepted: 01/15/2016] [Indexed: 01/22/2023]
Abstract
UNLABELLED An increase in subjective feelings of thirst and ad libitum drinking caused by an increase in serum osmolality have been observed following high intensity intermittent exercise (HIIE) compared to continuous exercise. The increase in serum osmolality is closely linked to the rise in blood lactate and serum sodium concentrations. However, during an ensuing recovery period after HIIE when serum osmolality will decrease, the resultant effect on sensations of thirst and subsequent water intake is unclear. Therefore the aim of the study was to assess the sensations of thirst and subsequent effect on ad libitum water consumption when water intake was immediately allowed, delayed or prevented following a period of HIIE. METHODS Twelve males (26±4 years, 80.1±9.3 kg, 1.81±0.05 m, V̇O2peak 60.1±8.9 ml·kg(-1)·min(-1)) participated in three randomised trials undertaken 7-14 days apart. Participants rested for 30 min then completed a 60 min HIIE exercise period (20×1 min at 100% V̇O2peak with 2 min rest) followed by 60 min of recovery, during which ad libitum water intake was provided immediately (W), delayed until the final 30 min (W30) or not permitted (NW). Body mass was measured at the start and end of the trial. Blood lactate and serum sodium concentrations serum osmolality and sensation of thirst were measured at baseline, immediately post-exercise and during the recovery. RESULTS Body mass loss was different between all trials (W: 0.25±0.45, W30: 0.49±0.37, NW: 1.29±0.37%; p<0.05). Sensations of thirst peaked post-exercise and decreased in W and W30 following water ingestion (p<0.05). Total voluntary water intake was greater in W trial (0.846±0.417 vs. 0.630±0.277l; p<0.05) but was similar during the first 30 min period of allowed drinking (0.618±0.297 vs. 0.630±0.277l; p>0.05). Serum osmolality (299±6 vs. 298±5 vs. 298±3 mOsmol·kg(-1)), blood lactate (7.1±1.1 vs. 7.2±1.1 vs. 7.1±1.2 mmol·l(-1)) and serum sodium concentrations (142±2 vs. 145±2 vs. 145±2 mmol·l(-1)) peaked post-exercise (W vs. W30 vs. NW; p<0.05) but were not different between trials (p>0.05). CONCLUSIONS Sensations of thirst were increased following HIIE and remained until satiated by water intake. This was despite the likely primary stimulus, serum osmolality, decreasing during the recovery period following a post-exercise peak. A combined effect of reduction in blood lactate and serum sodium concentrations, restoration of plasma volume and water intake contributed to the similar decrease in serum osmolality observed throughout the trials.
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Valenzuela PL, de la Villa P, Ferragut C. Effect of Two Types of Active Recovery on Fatigue and Climbing Performance. J Sports Sci Med 2015; 14:769-775. [PMID: 26664273 PMCID: PMC4657419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 09/03/2015] [Indexed: 06/05/2023]
Abstract
Performing intra-session recovery is important in rock climbing due to the multiple efforts that climbers are required to make in competitions, as well as repeated climbing trials that they carry out during training sessions. Active recovery has been shown to be a better option than passive recovery. However, the type of active recovery that should be done and the influence of the type and quantity of muscle mass activated are not clear. The aim of this study was to compare the effects of recovering with easy climbing (CR) or walking (WR) on markers of fatigue and climbing performance. For this purpose, 14 subjects participated in this randomly assigned crossover protocol completing three two-minute climbing trials separated by two minutes of active recovery with the assigned method. Seven days later participants carried out the same protocol with the other recovery method. Blood lactate (La(-)), rating of perceived exertion (RPE), and heart rate (HR) were analyzed as markers of fatigue and recovery, while meters climbed (MC) and handgrip force (HF) were analyzed for performance. La- values before the last climbing trial (p < 0.05; d = 0.69) and Peak La- values (p < 0.05; d = 0.77) were lower for CR than for WR. Climbers were able to ascend more meters in the set time when following the CR protocol (p < 0.01; d = 0.6), which shows the important role of the active recovery method carried out on climbing performance. There were no differences in HR, HF or RPE between protocols. A more sport-specific recovery protocol, in addition to moving great muscle mass (e.g. lower limbs), seems to enhance recovery and to facilitate lactate removal. For this reason, CR appears to be a more effective active recovery method than WR in sport rock climbing. Key pointsClimbing recovery improved lactate removal in comparison with walking recovery.Subjects were able to climb more meters in a determined time when easy climbing instead of walking during recoveries.Activating both great muscle mass like that of the lower limbs as well as the main fatigue producing muscles (forearms in climbing) seems more effective for recovering than activating just great muscle mass.
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Affiliation(s)
- Pedro L Valenzuela
- Physiology, Biology Systems Department, Faculty of Medicine, University of Alcalá , Madrid, Spain
| | - Pedro de la Villa
- Physiology, Biology Systems Department, Faculty of Medicine, University of Alcalá , Madrid, Spain
| | - Carmen Ferragut
- Sport and Physical Education Area, Department of Biomedical Sciences, Faculty of Medicine, University of Alcalá , Madrid, Spain
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Marriott M, Krustrup P, Mohr M. Ergogenic effects of caffeine and sodium bicarbonate supplementation on intermittent exercise performance preceded by intense arm cranking exercise. J Int Soc Sports Nutr 2015; 12:13. [PMID: 25750597 DOI: 10.1186/s12970-015-0075-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 02/17/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Caffeine and sodium bicarbonate ingestion have been suggested to improve high-intensity intermittent exercise, but it is unclear if these ergogenic substances affect performance under provoked metabolic acidification. To study the effects of caffeine and sodium bicarbonate on intense intermittent exercise performance and metabolic markers under exercise-induced acidification, intense arm-cranking exercise was performed prior to intense intermittent running after intake of placebo, caffeine and sodium bicarbonate. METHODS Male team-sports athletes (n = 12) ingested sodium bicarbonate (NaHCO3; 0.4 g.kg(-1) b.w.), caffeine (CAF; 6 mg.kg(-1) b.w.) or placebo (PLA) on three different occasions. Thereafter, participants engaged in intense arm exercise prior to the Yo-Yo intermittent recovery test level-2 (Yo-Yo IR2). Heart rate, blood lactate and glucose as well as rating of perceived exertion (RPE) were determined during the protocol. RESULTS CAF and NaHCO3 elicited a 14 and 23% improvement (P < 0.05), respectively, in Yo-Yo IR2 performance, post arm exercise compared to PLA. The NaHCO3 trial displayed higher [blood lactate] (P < 0.05) compared to CAF and PLA (10.5 ± 1.9 vs. 8.8 ± 1.7 and 7.7 ± 2.0 mmol.L(-1), respectively) after the Yo-Yo IR2. At exhaustion CAF demonstrated higher (P < 0.05) [blood glucose] compared to PLA and NaHCO3 (5.5 ± 0.7 vs. 4.2 ± 0.9 vs. 4.1 ± 0.9 mmol.L(-1), respectively). RPE was lower (P < 0.05) during the Yo-Yo IR2 test in the NaHCO3 trial in comparison to CAF and PLA, while no difference in heart rate was observed between trials. CONCLUSIONS Caffeine and sodium bicarbonate administration improved Yo-Yo IR2 performance and lowered perceived exertion after intense arm cranking exercise, with greater overall effects of sodium bicarbonate intake.
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Fazio F, Ferrantelli V, Fortino G, Arfuso F, Giangrosso G, Faggio C. The Influence of Acute Handling Stress on Some Blood Parameters in Cultured Sea Bream ( Sparus Aurata Linnaeus, 1758). Ital J Food Saf 2015; 4:4174. [PMID: 27800375 PMCID: PMC5076619 DOI: 10.4081/ijfs.2015.4174] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Revised: 09/18/2014] [Accepted: 09/19/2014] [Indexed: 11/22/2022] Open
Abstract
The effect of acute handling stress on haematological profile, blood glucose and lactate (secondary stress markers) in cultured sea bream Sparus aurata was evaluated. Sixty six Sparus aurata were used and equally divided into two groups (A and B). Group A was not subjected to stress, Group B was subjected to acute handling stress. From each fish, biometric data and blood samples were collected to evaluate haematological profile, blood glucose and lactate. Unpaired t-test Student was applied to evaluate possible differences in parameters between the two groups. Red blood cells, haematocrit, haemoglobin, white blood cells (WBC), glucose and lactate showed an increase (P<0.05) in Group B compared with Group A, while mean corpuscular volume decreased (P<0.05) in Group B. The results highlight the role of studied parameters in monitoring the stressful conditions of aquaculture production which affect animal welfare and fish products quality.
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Affiliation(s)
| | | | | | | | | | - Caterina Faggio
- Dipartimento di Scienze Biologiche e Ambientali, Università di Messina , S. Agata (ME), Italy
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Russell C, Papadopoulos E, Mezil Y, Wells GD, Plyley MJ, Greenway M, Klentrou P. Acute versus chronic supplementation of sodium citrate on 200 m performance in adolescent swimmers. J Int Soc Sports Nutr 2014; 11:26. [PMID: 24944546 PMCID: PMC4061773 DOI: 10.1186/1550-2783-11-26] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 06/05/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND A double-blinded, placebo-controlled, cross-over design was used to investigate whether two different sodium citrate dihydrate (Na-CIT) supplementation protocols improve 200 m swimming performance in adolescent swimmers. METHODS Ten, male swimmers (14.9 ± 0.4 years of age; 63.5 ± 4 kg) performed four 200 m time trials with the following treatments: acute (ACU) supplementation (0.5 g kg(-1) administered 120 min pre-trial), acute placebo (PLC-A), chronic (CHR) supplementation (0.1 g∙kg(-1) for three days and 0.3 g kg(-1) on the forth day 120 min pre-trial), and chronic placebo (PLC-C). The order of the trials was randomized, with at least a six-day wash-out period between trials. Blood samples were collected by finger prick pre-ingestion, 100 min post-ingestion, and 3 min post-trial. Performance time, rate of perceived exertion, pH, base excess, bicarbonate and lactate concentration were measured. RESULTS Post-ingestion bicarbonate and base excess were higher (P < 0.05) in both the ACU and CHR trials compared to placebo showing adequate pre-exercise alkalosis. However, performance time, rate of perceived exertion as well as post-trial pH and lactate concentration were not significantly different between trials. Further analysis revealed that five swimmers, identified as responders, improved their performance time by 1.03% (P < 0.05) and attained higher post-trial lactate concentrations in the ACU versus PLC-A trial (P < 0.05). They also had significantly higher post-trial lactate concentrations compared to the non-responders in the ACU and CHR trials. CONCLUSIONS Acute supplementation of Na-CIT prior to 200 m swimming performance led to a modest time improvement and higher blood lactate concentrations in only half of the swimmers while the chronic Na-CIT supplementation did not provide any ergogenic effect in this group of adolescent swimmers. TRIAL REGISTRATION Clinicaltrials.gov NCT01835912.
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Affiliation(s)
- Colin Russell
- Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, 500 Glenridge Av., St. Catharines, Ontario L2S 3A1, Canada
| | - Efthymios Papadopoulos
- Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, 500 Glenridge Av., St. Catharines, Ontario L2S 3A1, Canada
| | - Yasmeen Mezil
- Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, 500 Glenridge Av., St. Catharines, Ontario L2S 3A1, Canada
| | - Greg D Wells
- Faculty of Kinesiology and Physical Education, University of Toronto, 55 Harbord St., Toronto, Ontario M5S 2W6, Canada
| | - Michael J Plyley
- Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, 500 Glenridge Av., St. Catharines, Ontario L2S 3A1, Canada
| | - Mathew Greenway
- Michael G. DeGroote School of Medicine, McMaster University, 500 Glenridge Av., St. Catharines, Ontario L2S 3A1, Canada
| | - Panagiota Klentrou
- Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, 500 Glenridge Av., St. Catharines, Ontario L2S 3A1, Canada
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Verma I, Kaur S, Goyal S, Goyal S, Multani JS, Narang AP. Diagnostic value of lactate levels in acute abdomen disorders. Indian J Clin Biochem 2014; 29:382-5. [PMID: 24966491 DOI: 10.1007/s12291-013-0385-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Accepted: 09/13/2013] [Indexed: 12/22/2022]
Abstract
The supply of oxygen is limited in certain intra abdominal conditions due to direct vascular invasion or inflammatory process, resulting in high lactate levels. Aim of this study was to find the predictive value of lactate levels in the peritoneal fluid (PF) and blood of patients with acute abdomen. The study comprised of fifty patients with acute abdominal conditions, admitted in emergency ward of tertiary care hospital, thirty patients were with surgical abdomen (group I) and twenty patients with non surgical abdomen (group II). Lactate was estimated in PF and blood on Blood Gas Analyzer (NOVA, M-7). The mean lactate levels in PF were significantly higher in group I as compared to group II (14.65 ± 1.195 vs. 5.92 ± 0.97 mmol/L, p < 0.001). There was no significant difference in blood lactate levels in both the groups. When PF and blood lactate levels were compared within groups, we found that PF levels were significantly higher than blood in group I (14.65 ± 1.195 vs. 3.85 ± 0.54 mmol/L, p < 0.001) but not in group II (5.92 ± 0.97 vs. 4.36 ± 0.95 mmol/L). Diagnostic value was obtained using ROC curve. Cut off values obtained for PF lactate, difference and ratio of PF and blood lactate (≥6.4 mmol/L, ≥3.3 and ≥2.1 respectively) are at very high degree of sensitivity and specificity. So it can be useful marker of surgical emergency in patients with acute intra abdominal pathology, especially in clinically ill patients or in whom physical examination is not yielding because of neurologic disorders or unresponsiveness.
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Akşit T, Turgay F, Kutlay E, Z Özkol M, Vural F. The relationships between simulated tennis performance and biomarkers for nitric oxide synthesis. J Sports Sci Med 2013; 12:267-274. [PMID: 24149805 PMCID: PMC3761831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 11/20/2012] [Indexed: 06/02/2023]
Abstract
Tennis performance requires a good aerobic endurance and recovering capacity. Nitric oxide (NO) is a gas which is not only a vasodilator and antioxidant but it also regulates the use of oxygen and glucose. The aim of this study was to examine the relationships between simulated tennis performance test (PT) and NOx (sum of nitrate+nitrite) levels and lactate elimination speed (LES). Twenty well trained male tennis players with game levels of ITN 4 (International Tennis Number) and lower (mean ± SD; age 22.9 ± 2.6 yrs; height 1.82 ± 0.06 m and mass 75.7 ± 8.0 kg) participated in the study. Participants performed three 4-min bouts and a 2-min continuous groundstroke against balls projected from a tennis ball machine at speeds of 50, 55, 62 and 70 km·h(-1). After this exercise, subjects were given a 20 min passive rest. After each period and at during the recovery phase; plasma NOx, glucose (GLU) and lactate (LA) levels were determined. LES was calculated during passive recovery. GLU, LA and heart rate (HR) showed a linear increase in comparison to the values in the previous step while PT decreased significantly. Following each period NOx and glucose levels increased independently, but their decreasing rates in recovery phase were related (r = 0.470, p < 0.05). The successive increase in NOx and GLU parameters between the third and the forth periods was significant (p < 0.05). Only in the third period was there a significant relation between PT and NOx (r = 0.494; p < 0.05). In the present study, no significant relationship was found between PT and GLU, LA levels and LES. No significant correlation was found between simulated tennis performance and blood NOx levels. However the addition of loads like those in the third period in tennis trainings can be beneficial for performance in trained tennis players. It is recommended that the relationships between tennis performance with NOx and GLU are studied during a real tennis match. Key PointsIn a sport like tennis which lasts 2-6 hours and has short rests, performance depends on the player's capacity to perform the intensive exercise intermittently. Therefore, recovering potential is important in tennis.In none of the periods of this study were the expected (significant) relations observed of the athletes. Therefore, it can be claimed that LA increase, LA elimination and aerobic endurance do not play a significant role in the performance and the decrease in performance in this exercise model.
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Affiliation(s)
- Tolga Akşit
- Coaching Education Department, Ege University School of Physical Education and Sports , Bornova, Izmir, Turkey
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Zagatto AM, Papoti M, Gobatto CA. Validity of critical frequency test for measuring table tennis aerobic endurance through specific protocol. J Sports Sci Med 2008; 7:461-466. [PMID: 24149951 PMCID: PMC3761906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2008] [Accepted: 08/18/2008] [Indexed: 06/02/2023]
Abstract
UNLABELLED The aim of this study was to validate critical frequency specific test (critf) for the estimation of the aerobic endurance in table tennis players. METHODS Eight male international-level table tennis players participated of this study. Specific tests were applied by using a mechanical ball thrower to control the intensity of the exercise. The critf was determined by applying three or four series of exercises to exhaustion (Tlim). The critf was evaluated by using lactate steady state test (90, 100, and 106 % of critf intensity). The other specific test was an incremental protocol used to determine the anaerobic threshold (AnTBI) and the onset of blood lactate accumulation (OBLA) using a ball thrower. RESULTS The critf (39.87 ± 3.31 balls·min(-1)) was not significantly different among AnTBI (48.11 ± 7.36 balls·min(- 1)) and OBLA3.5 (49.36 ± 12.04 balls·min(-1)) frequencies and it was correlated with AnTBI parameter (r = 0.78). At frequencies of the 90 and 100% of critf a dynamic equilibrium was verified in lactate concentration between the eighth and twentieth minutes. However, this dynamic equilibrium was not found at 106% intensity. CONCLUSION The data indicate that in table tennis the critf model can be used for measuring the aerobic endurance. Key pointsIn table tennis is need the use of a specific protocol for evaluation of the aerobic endurance.The critical frequency test in table tennis seems to represent the intensity of maximal equilibrium of lactatemia.The critical frequency test can be used for measuring table tennis aerobic endurance through specific protocol.
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Affiliation(s)
- Alessandro M Zagatto
- Laboratory of Sport Applied Physiology, Sao Paulo State University-UNESP , Rio Claro, Brazil ; Laboratory of Research in Exercise Physiology (LAPEFE), Federal University of Mato Grosso do Sul (UFMS) , Campo Grande-MS, Brazil
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