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Carneiro-Barrera A, Amaro-Gahete FJ, Lucas JF, Sáez-Roca G, Martín-Carrasco C, Lavie CJ, Ruiz JR. Weight loss and lifestyle intervention for cardiorespiratory fitness in obstructive sleep apnea: The INTERAPNEA trial. PSYCHOLOGY OF SPORT AND EXERCISE 2024; 72:102614. [PMID: 38369267 DOI: 10.1016/j.psychsport.2024.102614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 01/04/2024] [Accepted: 02/15/2024] [Indexed: 02/20/2024]
Abstract
INTRODUCTION Although recent trials have shown benefits of weight loss and lifestyle interventions on obstructive sleep apnea (OSA) severity and comorbidities, the effect of these interventions on cardiorespiratory fitness (CRF) remains unknown. This study aimed to investigate the effects of an interdisciplinary weight loss and lifestyle intervention on CRF and self-reported physical fitness in adults with OSA. METHODS Eighty-nine men aged 18-65 years with moderate-to-severe OSA and a body mass index ≥25 kg/m2 were randomly assigned to a usual-care group or an 8-week interdisciplinary weight loss and lifestyle intervention. CRF was assessed through the 2-km walking test, and the International Fitness Scale (IFIS) was used to assess self-reported physical fitness. RESULTS As compared with usual-care, the intervention group had greater improvements at intervention endpoint in objective CRF (6% reduction in 2-km walking test total time, mean between-group difference, -1.7 min; 95% confidence interval, -2.3 to -1.1), and self-reported overall physical fitness (18% increase in IFIS total score, mean between-group difference, 2.3; 95% CI 1.2 to 3.3). At 6 months after intervention, the intervention group also had greater improvements in both 2-km walking test total time (10% reduction) and IFIS total score (22% increase), with mean between-group differences of -2.5 (CI 95%, -3.1 to -1.8) and 3.0 (CI 95%, 1.8 to 4.1), respectively. CONCLUSIONS An 8-week interdisciplinary weight loss and lifestyle intervention resulted in significant and sustainable improvements in CRF and self-reported physical fitness in men with overweight/obesity and moderate-to-severe OSA. STUDY REGISTRATION ClinicalTrials.gov registration (NCT03851653).
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Affiliation(s)
| | - Francisco J Amaro-Gahete
- CIBER de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Granada, Spain; Department of Physiology, Faculty of Medicine, University of Granada, Granada, Spain; Instituto de Investigación Biosanitaria, ibs.Granada, Granada 18012, Spain
| | - Jurado-Fasoli Lucas
- Department of Physical Education and Sports, Faculty of Sport Sciences, Sport and Health University Research Institute (iMUDS), University of Granada, Granada, 18010, Spain; EFFECTS-262 Research Group, Department of Medical Physiology, School of Medicine, University of Granada, Granada, 18010, Spain
| | - Germán Sáez-Roca
- Unidad de Trastornos Respiratorios del Sueño, Servicio de Neumología, Hospital Universitario Virgen de las Nieves, Granada, 18014, Spain
| | - Carlos Martín-Carrasco
- Unidad de Trastornos Respiratorios del Sueño, Servicio de Neumología, Hospital Universitario Virgen de las Nieves, Granada, 18014, Spain
| | - Carl J Lavie
- Department of Cardiovascular Diseases, John Ochsner Heart and Vascular Institute, Ochsner Clinical School, The University of Queensland School of Medicine, New Orleans 70121, LA, United States
| | - Jonatan R Ruiz
- CIBER de Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, Granada, Spain; Instituto de Investigación Biosanitaria, ibs.Granada, Granada 18012, Spain; Department of Physical Education and Sports, Faculty of Sport Sciences, Sport and Health University Research Institute (iMUDS), University of Granada, Granada, 18010, Spain
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Guglielmi V, Bettini S, Sbraccia P, Busetto L, Pellegrini M, Yumuk V, Colao AM, El Ghoch M, Muscogiuri G. Beyond Weight Loss: Added Benefits Could Guide the Choice of Anti-Obesity Medications. Curr Obes Rep 2023:10.1007/s13679-023-00502-7. [PMID: 37209215 DOI: 10.1007/s13679-023-00502-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/29/2023] [Indexed: 05/22/2023]
Abstract
PURPOSE OF REVIEW To highlight the added benefits of approved and upcoming, centrally-acting, anti-obesity drugs, focusing not only on the most common metabolic and cardiovascular effects but also on their less explored clinical benefits and drawbacks, in order to provide clinicians with a tool for more comprehensive, pharmacological management of obesity. RECENT FINDINGS Obesity is increasingly prevalent worldwide and has become a challenge for healthcare systems and societies. Reduced life expectancy and cardiometabolic complications are some of the consequences of this complex disease. Recent insights into the pathophysiology of obesity have led to the development of several promising pharmacologic targets, so that even more effective drugs are on the horizon. The perspective of having a wider range of treatments increases the chance to personalize therapy. This primarily has the potential to take advantage of the long-term use of anti-obesity medication for safe, effective and sustainable weight loss, and to concomitantly address obesity complications/comorbidities when already established. The evolving scenario of the availability of anti-obesity drugs and the increasing knowledge of their added effects on obesity complications will allow clinicians to move into a new era of precision medicine.
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Affiliation(s)
- Valeria Guglielmi
- Dept. of Systems Medicine, University of Rome Tor Vergata, Rome, Italy
- Internal Medicine Unit - Obesity Center, University Hospital Policlinico Tor Vergata, Rome, Italy
| | - Silvia Bettini
- Center for the Study and the Integrated Treatment of Obesity, Internal Medicine 3, Padua University Hospital, Padua, Italy
| | - Paolo Sbraccia
- Dept. of Systems Medicine, University of Rome Tor Vergata, Rome, Italy
- Internal Medicine Unit - Obesity Center, University Hospital Policlinico Tor Vergata, Rome, Italy
| | - Luca Busetto
- Center for the Study and the Integrated Treatment of Obesity, Internal Medicine 3, Padua University Hospital, Padua, Italy
| | - Massimo Pellegrini
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41121, Modena, Italy
| | - Volkan Yumuk
- Division of Endocrinology, Metabolism & Diabetes Istanbul University Cerrahpaşa Medical Faculty, Istanbul, Türkiye
| | - Anna Maria Colao
- Italian Centre for the Care and Well-Being of Patients With Obesity (C.I.B.O), Dipartimento Di Medicina Clinica E Chirurgia, Università Federico II, 80131, Naples, Italy
- Dipartimento Di Medicina Clinica E Chirurgia, Diabetologia E Andrologia, Unità Di Endocrinologia, Università Degli Studi Di Napoli Federico II, Via Sergio Pansini 5, 80131, Naples, Italy
- Cattedra Unesco "Educazione Alla Salute E Allo Sviluppo Sostenibile", University Federico II, Naples, Italy
| | - Marwan El Ghoch
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Beirut Arab University, P.O. Box 11-5020, Riad El Solh, Beirut, Lebanon
| | - Giovanna Muscogiuri
- Dipartimento Di Medicina Clinica E Chirurgia, Diabetologia E Andrologia, Unità Di Endocrinologia, Università Degli Studi Di Napoli Federico II, Via Sergio Pansini 5, 80131, Naples, Italy.
- Cattedra Unesco "Educazione Alla Salute E Allo Sviluppo Sostenibile", University Federico II, Naples, Italy.
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Stavrou VT, Astara K, Tourlakopoulos KN, Papayianni E, Boutlas S, Vavougios GD, Daniil Z, Gourgoulianis KI. Obstructive Sleep Apnea Syndrome: The Effect of Acute and Chronic Responses of Exercise. Front Med (Lausanne) 2022; 8:806924. [PMID: 35004785 PMCID: PMC8738168 DOI: 10.3389/fmed.2021.806924] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 12/07/2021] [Indexed: 11/22/2022] Open
Abstract
Obstructive Sleep Apnea Syndrome (OSAS) is a sleep disorder with high prevalence in general population, but alarmingly low in clinicians' differential diagnosis. We reviewed the literature on PubMed and Scopus from June 1980–2021 in order to describe the altered systematic pathophysiologic mechanisms in OSAS patients as well as to propose an exercise program for these patients. Exercise prevents a dysregulation of both daytime and nighttime cardiovascular autonomic function, reduces body weight, halts the onset and progress of insulin resistance, while it ameliorates excessive daytime sleepiness, cognitive decline, and mood disturbances, contributing to an overall greater sleep quality and quality of life.
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Affiliation(s)
- Vasileios T Stavrou
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Kyriaki Astara
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Konstantinos N Tourlakopoulos
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Eirini Papayianni
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Stylianos Boutlas
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - George D Vavougios
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Zoe Daniil
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Konstantinos I Gourgoulianis
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
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Powell TA, Mysliwiec V, Brock MS, Morris MJ. OSA and cardiorespiratory fitness: a review. J Clin Sleep Med 2022; 18:279-288. [PMID: 34437054 PMCID: PMC8807904 DOI: 10.5664/jcsm.9628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The effects of untreated obstructive sleep apnea (OSA) on cardiopulmonary function remain unclear. Cardiorespiratory fitness (CRF), commonly reflected by VO2 max measured during cardiopulmonary exercise testing, has gained popularity in evaluating numerous cardiopulmonary conditions and may provide a novel means of identifying OSA patients with the most clinically significant disease. This emerging testing modality provides simultaneous assessment of respiratory and cardiovascular function with results helping uncover evidence of evolving pathology in either organ system. In this review, we highlight the current state of the literature in regard to OSA and CRF with a specific focus on changes in cardiovascular function that have been previously noted. While OSA does not appear to limit respiratory function during exercise, studies seem to suggest an abnormal cardiovascular exercise response in this population including decreased cardiac output, a blunted heart rate response (ie, chronotropic incompetence), and exaggerated blood pressure response. Surprisingly, despite these observed changes in the cardiovascular response to exercise, results involving VO2 max in OSA remain inconclusive. This is reflected by VO2 max studies involving middle-aged OSA patients showing both normal and reduced CRF. As prior studies have not extensively characterized oxygen desaturation burden, we propose that reductions in VO2 max may exist in OSA patients with only the most significant disease (as reflected by nocturnal hypoxia). Further characterizing this relationship remains important as some research suggests that positive airway pressure therapy or aerobic exercise may improve CRF in patients with OSA. In conclusion, while it likely that severe OSA, via an abnormal cardiovascular response to exercise, is associated with decreased CRF, further study is clearly warranted to include determining if OSA with decreased CRF is associated with increased morbidity or mortality. CITATION Powell TA, Mysliwiec V, Brock MS, Morris MJ. OSA and cardiorespiratory fitness: a review. J Clin Sleep Med. 2022;18(1):279-288.
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Affiliation(s)
- Tyler A. Powell
- Sleep Medicine Service, Wilford Hall Ambulatory Surgery Center, JBSA Lackland Air Force Base, Texas,Address correspondence to: Tyler A. Powell, MD, Sleep Medicine Service, Wilford Hall Ambulatory Service Center, JBSA Lackland Air Force Base, TX 78234; ,
| | - Vincent Mysliwiec
- Department of Psychiatry and Behavioral Sciences, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Matthew S. Brock
- Sleep Medicine Service, Wilford Hall Ambulatory Surgery Center, JBSA Lackland Air Force Base, Texas
| | - Michael J. Morris
- Graduate Medical Education, Brooke Army Medical Center, JBSA Fort Sam Houston, Texas
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Supervised Versus Unsupervised Pulmonary Rehabilitation in Patients with Pulmonary Embolism: A Valuable Alternative in COVID Era. J Funct Morphol Kinesiol 2021; 6:jfmk6040098. [PMID: 34940507 PMCID: PMC8705387 DOI: 10.3390/jfmk6040098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/28/2021] [Accepted: 12/02/2021] [Indexed: 12/17/2022] Open
Abstract
The aim of our study was to assess the effect of 8 weeks of pulmonary rehabilitation (PR) in patients with pulmonary embolism (PE) during unsupervised PR (unSPRgroup) versus supervised PR (SPRgroup) on cardiopulmonary exercise testing (CPET) parameters, sleep quality, quality of life and cardiac biomarkers (NT-pro-BNP). Fourteen patients with PE (unSPRgroup, n = 7, vs. SPRgroup, n = 7) were included in our study (age, 50.7 ± 15.1 years; BMI, 30.0 ± 3.3 kg/m2). We recorded anthropometric characteristics and questionnaires (Quality of life (SF-36) and Pittsburg sleep quality index (PSQI)), we performed blood sampling for NT-pro-BNP measurement and underwent CPET until exhausting before and after the PR program. All patients were subjected to transthoracic echocardiography prior to PR. The SPRgroup differed in mean arterial pressure at rest before and after the PR program (87.6 ± 3.3 vs. 95.0 ± 5.5, respectively, p = 0.010). Patients showed increased levels of leg fatigue (rated after CPET) before and after PR (p = 0.043 for SPRgroup, p = 0.047 for unSPRgroup) while the two groups differed between each other (p = 0.006 for post PR score). Both groups showed increased levels in SF-36 scores (general health; p = 0.032 for SPRgroup, p = 0.010 for unSPRgroup; physical health; p = 0.009 for SPRgroup, p = 0.022 for unSPRgroup) and reduced levels in PSQI (cannot get to sleep within 30-min; p = 0.046 for SPRgroup, p = 0.007 for unSPRgroup; keep up enough enthusiasm to get things done; p = 0.005 for SPRgroup, p = 0.010 for unSPRgroup) following the PR program. The ΝT-pro-BNP was not significantly different before and after PR or between groups. PR may present a safe intervention in patients with PE. The PR results are similar in SPRgroup and unSPRgroup.
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Barazi N, Polidovitch N, Debi R, Yakobov S, Lakin R, Backx PH. Dissecting the Roles of the Autonomic Nervous System and Physical Activity on Circadian Heart Rate Fluctuations in Mice. Front Physiol 2021; 12:692247. [PMID: 34733171 PMCID: PMC8558381 DOI: 10.3389/fphys.2021.692247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 09/22/2021] [Indexed: 01/02/2023] Open
Abstract
Heart rate (HR) and blood pressure as well as adverse cardiovascular events show clear circadian patterns, which are linked to interdependent daily variations in physical activity and cardiac autonomic nerve system (ANS) activity. We set out to assess the relative contributions of the ANS (alone) and physical activity to circadian HR fluctuations. To do so, we measured HR (beats per minute, bpm) in mice that were either immobilized using isoflurane anesthesia or free-moving. Nonlinear fits of HR data to sine functions revealed that anesthetized mice display brisk circadian HR fluctuations with amplitudes of 47.1±7.4bpm with the highest HRs in middle of the dark (active) period (ZT 18: 589±46bpm) and lowest HRs in the middle of the light (rest) period (ZT 6: 497±54bpm). The circadian HR fluctuations were reduced by ~70% following blockade of cardiac parasympathetic nervous activity (PNA) with atropine while declining by <15% following cardiac sympathetic nerve activity (SNA) blockade with propranolol. Small HR fluctuation amplitudes (11.6±5.9bpm) remained after complete cardiac ANS blockade. Remarkably, circadian HR fluctuation amplitudes in freely moving, telemetrized mice were only ~32% larger than in anesthetized mice. However, after gaining access to running wheels for 1week, circadian HR fluctuations increase to 102.9±12.1bpm and this is linked directly to increased O2 consumption during running. We conclude that, independent of physical activity, the ANS is a major determinant of circadian HR variations with PNA playing a dominant role compared to SNA. The effects of physical activity to the daily HR variations are remarkably small unless mice get access to running wheels.
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Affiliation(s)
- Nour Barazi
- Department of Biology, York University, Toronto, ON, Canada
| | | | - Ryan Debi
- Department of Biology, York University, Toronto, ON, Canada
| | - Simona Yakobov
- Department of Biology, York University, Toronto, ON, Canada
| | - Robert Lakin
- Department of Biology, York University, Toronto, ON, Canada
| | - Peter H Backx
- Department of Biology, York University, Toronto, ON, Canada
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Vecchiato M, Neunhaeuserer D, Quinto G, Bettini S, Gasperetti A, Battista F, Vianello A, Vettor R, Busetto L, Ermolao A. Cardiopulmonary exercise testing in patients with moderate-severe obesity: a clinical evaluation tool for OSA? Sleep Breath 2021; 26:1115-1123. [PMID: 34487305 PMCID: PMC9418285 DOI: 10.1007/s11325-021-02475-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/24/2021] [Accepted: 08/11/2021] [Indexed: 11/25/2022]
Abstract
Purpose Obstructive sleep apnea (OSA) is a widespread comorbidity of obesity. Nasal continuous positive airway pressure (CPAP) has been demonstrated very effective in treating patients with OSA. The aims of this study were to investigate whether or not cardiopulmonary exercise testing (CPET) can characterize patients with OSA and to evaluate the effect of nasal CPAP therapy. Methods An observational study was conducted on patients with moderate to severe obesity and suspected OSA. All patients underwent cardiorespiratory sleep study, spirometry, and functional evaluation with ECG-monitored, incremental, maximal CPET. Results Of the 147 patients, 94 presented with an apnea–hypopnea index (AHI) ≥ 15 events/h and were thus considered to have OSA (52 receiving nasal CPAP treatment; 42 untreated) while 53 formed a control group (AHI < 15 events/h). Patients with untreated OSA showed significantly lower oxygen uptake (VO2), heart rate, minute ventilation (VE), and end tidal carbon dioxide (PETCO2) at peak exercise compared to controls. Patients receiving nasal CPAP showed higher VE and VO2 at peak exercise compared to untreated patients. A difference in PETCO2 between the maximum value reached during test and peak exercise (ΔPETCO2 max-peak) of 1.71 mmHg was identified as a predictor of OSA. Conclusion Patients with moderate to severe obesity and untreated OSA presented a distinctive CPET-pattern characterized by lower aerobic and exercise capacity, higher PETCO2 at peak exercise associated with a lower ventilatory response. Nasal CPAP treatment was shown to positively affect these cardiorespiratory adaptations during exercise. ΔPETCO2 max-peak may be used to suggest OSA in patients with obesity.
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Affiliation(s)
- Marco Vecchiato
- Sports and Exercise Medicine Division, Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
- Clinical Network of Sport and Exercise Medicine of the Veneto Region, Padova, Italy
| | - Daniel Neunhaeuserer
- Sports and Exercise Medicine Division, Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy.
- Clinical Network of Sport and Exercise Medicine of the Veneto Region, Padova, Italy.
| | - Giulia Quinto
- Sports and Exercise Medicine Division, Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
- Clinical Network of Sport and Exercise Medicine of the Veneto Region, Padova, Italy
| | - Silvia Bettini
- Center for the Study and Integrated Treatment of Obesity (CeSTIO), Internal Medicine 3, Department of Medicine, University of Padova, Padova, Veneto Region, Italy
| | - Andrea Gasperetti
- Sports and Exercise Medicine Division, Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
- Clinical Network of Sport and Exercise Medicine of the Veneto Region, Padova, Italy
| | - Francesca Battista
- Sports and Exercise Medicine Division, Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
- Clinical Network of Sport and Exercise Medicine of the Veneto Region, Padova, Italy
| | - Andrea Vianello
- Respiratory Pathophysiology Unit, Department of Cardiological, Thoracic and Vascular Sciences, University of Padova, Padova, Italy
| | - Roberto Vettor
- Center for the Study and Integrated Treatment of Obesity (CeSTIO), Internal Medicine 3, Department of Medicine, University of Padova, Padova, Veneto Region, Italy
| | - Luca Busetto
- Center for the Study and Integrated Treatment of Obesity (CeSTIO), Internal Medicine 3, Department of Medicine, University of Padova, Padova, Veneto Region, Italy
| | - Andrea Ermolao
- Sports and Exercise Medicine Division, Department of Medicine, University of Padova, Via Giustiniani 2, 35128, Padova, Italy
- Clinical Network of Sport and Exercise Medicine of the Veneto Region, Padova, Italy
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Han T, Zhang L, Yu CY, Li YM, Wang Y, Zhang XL. Ventilatory response to exercise is preserved in patients with obesity hypoventilation syndrome. J Clin Sleep Med 2021; 16:2089-2098. [PMID: 32895118 DOI: 10.5664/jcsm.8766] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Blunted ventilatory responses to hypoxia and hypercapnia during resting conditions are common findings in patients with obesity hypoventilation syndrome (OHS). Exercise increases the work and oxygen cost of breathing and produces excessive carbon dioxide (CO₂). The aim of this investigation was to study ventilatory responses to incremental exercise in patients with OHS. METHODS Sixty-eight obese adults with OHS (n = 15), eucapnic obstructive sleep apnea (n = 26), or simple obesity (n = 27) participated in an incremental exercise test on a cycle ergometer and an in-laboratory sleep study. RESULTS The peak oxygen uptake (peak VO₂) and peak pulse oxygen was decreased in patients with OHS compared with patients with either obstructive sleep apnea or simple obesity. The ventilatory response to exertional metabolic demand (nadir VE/VCO₂, ∆VE/∆VCO₂ slope, and VE/VCO₂ at peak exercise) did not significantly differ among the 3 groups. Minute ventilation, tidal volume, respiratory frequency, tidal volume/respiratory frequency, and inspiratory time/total time ratio at a given work rate were comparable among the 3 groups. Among the whole cohort, apnea-hypopnea index was not independently associated with peak VO₂, and no association was found between the ∆VE/∆VCO₂ slope and resting arterial partial pressure of CO₂. CONCLUSIONS The ventilatory response to incremental exercise is preserved in patients with OHS compared with patients with obstructive sleep apnea and simple obesity who were matched for age and body mass index. This result highlights the complexity of the respiratory control system during exercise for patients with OHS, which may be uncoupled with the ventilatory response during sleep and resting conditions.
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Affiliation(s)
- Teng Han
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China.,National Clinical Research Center for Respiratory Diseases, Beijing, China
| | - Li Zhang
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China.,National Clinical Research Center for Respiratory Diseases, Beijing, China.,Peking University Health Science Center, Beijing, China
| | - Chun Yan Yu
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China.,National Clinical Research Center for Respiratory Diseases, Beijing, China
| | - Yi Ming Li
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China.,National Clinical Research Center for Respiratory Diseases, Beijing, China
| | - Yan Wang
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China.,National Clinical Research Center for Respiratory Diseases, Beijing, China
| | - Xiao Lei Zhang
- Department of Pulmonary and Critical Care Medicine, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China.,National Clinical Research Center for Respiratory Diseases, Beijing, China.,Peking University Health Science Center, Beijing, China.,Capital Medical University, Beijing, China.,The Graduate School of Peking Union Medical College, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
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Aldhahi M, Puri S, Jain V, E. Herrick J. Energy cost of walking and functional aerobic capacity during moderate intensity exercise in adults with obstructive sleep apnea: a cross-sectional study. SLEEP SCIENCE AND PRACTICE 2021. [DOI: 10.1186/s41606-021-00061-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Autonomic dysregulation associated with obstructive sleep apnea (OSA) may limit cardiopulmonary responses to exercise, which, in turn, may impair functional aerobic capacity (FAC) and walking economy. We aimed to characterize walking economy and FAC in OSA patients compared with healthy adults (non-OSA) and examine their relationship with OSA severity (apnea-hypopnea index [AHI]).
Methods
A total of 26 adults (OSA, n = 13; non-OSA, n = 13) participated in this cross-sectional study. In this study, the participants with OSA were between the ages of 25 and 60 years, with a body mass index of 25 kg/m2 to 39 kg/m2, and who had undergone a recent third-party sleep study with an AHI of 5 or greater. Participants completed a maximal integrated cardiopulmonary exercise test, three separate exercise bouts of constant work rate (CWR) treadmill test at 85% of anaerobic threshold (AT), and a 10-min walk test (10MWT). Multiple linear regression analysis corrected for weight, age, and BMI were performed to examine the associations.
Results
There were significant differences between OSA and non-OSA participants in VO2peak (29.7 ± 5.6 mL/kg/min vs. 37.5 ± 6.5 mL/kg/min, p = 0.03) and Net VO2 during CWR (12.7 ± 5 vs.19 ± 6 mL/kg/min, p = 0.02). The 10MWT speed and distance were significantly lower in the OSA group (all p < 0.001). The energy cost of walking during submaximal exercise and 10-min walk test was higher among patients with OSA (all p < 0.001). The AHI scores were associated with 10MWT distance (R2 = 0.85, p < 0.001), energy cost of walking (R2 = 87, p < 0.001), and VO2 at anaerobic threshold (R2 = 0.92, p < 0.001).
Conclusions
The findings of this study show that patients with OSA have reduced FAC and a higher energy cost of walking. AHI explained 87% of variance in the energy cost of walking during the 10MWT. The results suggest that individuals with more severe obstructive sleep apnea experience greater impairment in functional performance.
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Stavrou VT, Astara K, Tourlakopoulos KN, Daniil Z, Gourgoulianis KI, Kalabakas K, Karagiannis D, Basdekis G. Sleep Quality's Effect on Vigilance and Perceptual Ability in Adolescent and Adult Athletes. JOURNAL OF SPORTS MEDICINE (HINDAWI PUBLISHING CORPORATION) 2021; 2021:5585573. [PMID: 33937414 PMCID: PMC8055422 DOI: 10.1155/2021/5585573] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 03/21/2021] [Accepted: 03/24/2021] [Indexed: 12/21/2022]
Abstract
The aim of the study was to investigate the effect of sleep quality in cognitive domains of perceptual ability after exhausting exercise in adolescent and adult athletes. Eighty-six male professional soccer players were included in our study and divided into two groups: adolescents (age: 17.3 ± 0.2 yrs, body mass: 68.9 ± 7.9 kg, body fat: 9.9 ± 3.6 %) versus adults (age: 26.3 ± 5.2 yrs, body mass: 76.5 ± 7.2 kg, body fat: 10.3 ± 3.1 %). For each athlete, prior to cardiopulmonary exercise testing (CPET), anthropometric and morphological characteristics were recorded and Pittsburgh Sleep Quality Index (PSQI) questionnaire was answered. Immediately after CPET, all athletes underwent the perceptual ability test (PATest) for 30 sec and the sum of hits (rep/30 sec) and the time between a visual stimulus and the following stimulus (mean reaction time; RT, sec) were recorded. Oxygen uptake in maximal effort and in anaerobic threshold showed differences between hits (P=0.037) and RT (P=0.025). The variable of PSQI questionnaire "had bad dreams" showed correlation with hits (P=0.021) and RT (P=0.011) and the RT showed correlation with variables "cannot breathe comfortably" (P=0.041) and "...enthusiasm to get things done" (P=0.041). Adolescents showed poorer sleep quality (PSQI score: 5.7 ± 3.6 vs. 2.4 ± 2.6) compared to adults and slower reaction time (0.9 ± 0.1 vs. 0.8 ± 0.1 sec, P=0.029) compared to adolescent athletes with PSQI score ≥5.5. The variable of PSQI score in adolescents is related to HR in maximal effort (r = -0.364, P=0.032) and in adults is related to speed (r = -0.335, P=0.016). Perceptual ability, which requires sustained attention, vigilance, and motor coordination, is often negatively affected by restricted sleep, especially in adolescents.
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Affiliation(s)
- Vasileios T. Stavrou
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
- The Medical Project, Prevention, Evaluation and Recovery Center, Larissa, Greece
| | - Kyriaki Astara
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Konstantinos N. Tourlakopoulos
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Zoe Daniil
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | - Konstantinos I. Gourgoulianis
- Laboratory of Cardio-Pulmonary Testing and Pulmonary Rehabilitation, Department of Respiratory Medicine, Faculty of Medicine, University of Thessaly, Larissa, Greece
| | | | | | - George Basdekis
- The Medical Project, Prevention, Evaluation and Recovery Center, Larissa, Greece
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Fletcher HV, Cho PSP, Loong SL, Estrada-Petrocelli L, Patel AS, Birring SS, Lee KK. Effect of continuous positive airway pressure on maximal exercise capacity in patients with obstructive sleep apnea: a systematic review and meta-analysis. J Clin Sleep Med 2020; 16:1847-1855. [PMID: 32662419 DOI: 10.5664/jcsm.8686] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
STUDY OBJECTIVES Exercise capacity is impaired in obstructive sleep apnea (OSA). There are conflicting reports on the effect of continuous positive airway pressure (CPAP) on maximal exercise capacity. The objective of this review was to determine if there is a change in exercise capacity and anaerobic threshold following CPAP treatment in OSA patients. METHODS We conducted a systematic review and meta-analyses to summarize the changes in peak rate of oxygen uptake (V̇O₂ peak) or maximum rate of oxygen uptake (V̇O2 max) and anaerobic threshold (AT) during cardiopulmonary exercise testing following CPAP intervention in patients with OSA. A systematic literature review was conducted to identify published literature on markers of V̇O₂ peak, V̇O₂ max, and AT pre- vs post-CPAP using a web-based literature search of PubMed/MEDLINE, Embase, CINAHL, and Cochrane review (CENTRAL) databases. Two independent reviewers screened the articles for data extraction and analysis. RESULTS The total search of all the databases returned 470 relevant citations. Following application of eligibility criteria, 6 studies were included in the final meta-analysis for V̇O₂ peak, 2 studies for V̇O₂ max, and five studies for AT. The meta-analysis showed a mean net difference in V̇O₂ peak between pre- and post-CPAP of 2.69 mL·kg-1·min-1, P = .02, favoring treatment with CPAP. There was no difference in V̇O₂ max or AT with CPAP treatment (mean net difference 0.66 mL·kg-1·min-1 [P = .78] and -144.98 mL·min-1 [P = .20] respectively). CONCLUSIONS There is a paucity of high-quality studies investigating the effect of CPAP on exercise capacity. Our meta-analysis shows that V̇O₂ peak increases following CPAP treatment in patients with OSA, but we did not observe any change in V̇O₂ max or AT. Our findings should be considered preliminary and we recommend further randomized controlled trials to confirm our findings and to clarify the peak and maximum rates of oxygen uptake adaptations with CPAP therapy.
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Affiliation(s)
- Hannah V Fletcher
- Department of Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, United Kingdom
| | - Peter S P Cho
- Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London, London, United Kingdom
| | - Stewart Lee Loong
- National Institute of Health Research/Wellcome King's Clinical Research Facility, London, United Kingdom
| | - Luis Estrada-Petrocelli
- Institut de Bioenginyeria de Catalunya (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona, Spain.,Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain.,Universidad Latina de Panamá, Facultad de Ingeniería, Panama, Panama
| | - Amit S Patel
- Department of Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, United Kingdom
| | - Surinder S Birring
- Department of Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, United Kingdom.,Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London, London, United Kingdom
| | - Kai K Lee
- Department of Respiratory Medicine, King's College Hospital NHS Foundation Trust, London, United Kingdom.,Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences, King's College London, London, United Kingdom
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Berger M, Kline CE, Cepeda FX, Rizzi CF, Chapelle C, Laporte S, Hupin D, Raffin J, Costes F, Hargens TA, Barthélémy JC, Roche F. Does obstructive sleep apnea affect exercise capacity and the hemodynamic response to exercise? An individual patient data and aggregate meta-analysis. Sleep Med Rev 2019; 45:42-53. [PMID: 30933881 DOI: 10.1016/j.smrv.2019.03.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 02/14/2019] [Accepted: 03/07/2019] [Indexed: 10/27/2022]
Abstract
Obstructive sleep apnea (OSA) has been linked to altered cardiovascular response to exercise. A systematic review and individual patient data (IPD) meta-analysis were conducted to assess whether OSA patients present reduced exercise capacity. PubMed, Embase and Web of Science were searched until September 2018. Studies which performed sleep recording in both OSA patients and controls and measured maximal oxygen consumption (VO2peak) via a maximal exercise test were included. IPD were provided for five trials upon the 18 eligible (N = 289) and a two-stage IPD meta-analysis model was used, allowing to standardize the apnea cutoff and adjust for confounders. IPD meta-analysis demonstrated that moderate to severe OSA patients had similar VO2peak (mean difference: -1.03 mL·kg-1 min-1; 95% CI: -3.82 to 1.76; p = 0.47) and cardiovascular response to exercise compared to mild or non-OSA patients. By contrast, aggregate data (AD) meta-analysis including the 13 trials for which IPD were unavailable (N = 605) revealed that VO2peak was reduced in OSA patients compared to controls (mean difference: -2.30 mL·kg-1 min-1; 95% CI: -3.96 to -0.63; p < 0.001) with high heterogeneity. In conclusion, IPD meta-analysis suggests that VO2peak and the cardiovascular response to exercise are preserved in moderate to severe OSA patients while AD meta-analysis suggests lower VO2peak in severe OSA.
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Affiliation(s)
- Mathieu Berger
- SNA-EPIS Laboratory, University of Lyon, University Jean Monnet Saint-Etienne, EA 4607, France; Department of Clinical and Exercise Physiology, University Hospital of Saint-Etienne, France.
| | - Christopher E Kline
- Department of Health and Physical Activity, University of Pittsburgh, Pittsburgh, PA, United States
| | - Felipe X Cepeda
- Heart Institute (InCor), University of São Paulo Medical School, São Paulo, Brazil
| | - Camila F Rizzi
- Cardiology Discipline, Medicine Department, Universidade Federal de Sao Paulo, Sao Paulo, Brazil
| | - Céline Chapelle
- INSERM, UMR 1059, SAINBIOSE, Dysfonction Vasculaire et Hémostase, Université Jean Monnet, Saint-Etienne, France
| | - Silvy Laporte
- INSERM, UMR 1059, SAINBIOSE, Dysfonction Vasculaire et Hémostase, Université Jean Monnet, Saint-Etienne, France
| | - David Hupin
- SNA-EPIS Laboratory, University of Lyon, University Jean Monnet Saint-Etienne, EA 4607, France; Department of Clinical and Exercise Physiology, University Hospital of Saint-Etienne, France
| | - Jérémy Raffin
- SNA-EPIS Laboratory, University of Lyon, University Jean Monnet Saint-Etienne, EA 4607, France; Department of Clinical and Exercise Physiology, University Hospital of Saint-Etienne, France
| | - Frédéric Costes
- Department of Physiology, University Hospital Gabriel Montpied, Clermont-Ferrand, France
| | - Trent A Hargens
- Human Performance Laboratory, Department of Kinesiology, James Madison University, Harrisonburg, VA, United States
| | - Jean-Claude Barthélémy
- SNA-EPIS Laboratory, University of Lyon, University Jean Monnet Saint-Etienne, EA 4607, France; Department of Clinical and Exercise Physiology, University Hospital of Saint-Etienne, France
| | - Frédéric Roche
- SNA-EPIS Laboratory, University of Lyon, University Jean Monnet Saint-Etienne, EA 4607, France; Department of Clinical and Exercise Physiology, University Hospital of Saint-Etienne, France
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Stavrou V, Boutou AK, Vavougios GD, Pastaka C, Gourgoulianis KI, Koutedakis Y, Daniil Z, Karetsi E. The use of cardiopulmonary exercise testing in identifying the presence of obstructive sleep apnea syndrome in patients with compatible symptomatology. Respir Physiol Neurobiol 2019; 262:26-31. [PMID: 30684645 DOI: 10.1016/j.resp.2019.01.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 01/13/2019] [Accepted: 01/22/2019] [Indexed: 11/18/2022]
Abstract
The aim of this study was to investigate the relationship between cardiopulmonary exercise testing (CPET) and the presence of obstructive sleep apnea syndrome (OSAS) in order to provide an innovative tool to identify patients with OSAS. A prospective nested case control design was adopted. A consecutive population of male volunteers referred to a Sleep Unit was subjected to nocturnal polysomnography, full lung function testing and maximal CPET. A stepwise linear discriminant function analysis (DFA) was applied to construct a model which could identify individuals with moderate-to-severe OSAS from healthy controls. The total of 30 volunteers formed the OSAS and 24 the non-OSAS groups. Demographic and somatometric parameters were similar between groups. Patients presented with lower Expiratory Reserve Volume (ERV: 106.7 ± 28.3 vs. 123.9 ± 22.1, p < 0.001), Leg FatigueBorg scale (3.9 ± 1.1 vs. 6.1 ± 1.4, p < 0.001), VO2peak(25.0 ± 5.9 vs. 32.9 ± 7.2 ml/kg-1/min-1, p < 0.001), peak breathing frequency (31.0 ± 5.8 vs. 35.5 ± 7.3 1/min-1, p < 0.001) and peak heart rate (151.1 ± 17.7 vs. 171.2 ± 12.6 beats/min-1, p < 0.001) compared to controls, but higher peak end-tidal CO2 (PETCO2peak:38.6 ± 4.2 vs. 35.0 ± 4.9 mmHg, p = 0.043) and peak systolic (SBP:188.3 ± 21.9 vs. 173.1 ± 17.9 mmHg, p = 0.009) and diastolic (DBP: 91.3 ± 8.2 vs. 85.4 ± 8.2 mmHg, p = 0.011) blood pressure. Stepwise DFA indicated that ERV% of predicted (0.372), PETCO2peak (-0.376), SpO2resting (0.0667), Leg Fatigue Borg scale (0.564), HRpeak (0.530) and DBPpeak (-0.543) could separate the two groups, with an overall predictive accuracy of 96.3%. Selected CPET parameters (ERV% of predicted, PETCO2peak, SpO2resting, HRpeak, DBPpeak and Leg FatigueBorg Scale) are independently associated with OSAS presence and could discriminate patients with and without this disorder.
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Affiliation(s)
- Vasileios Stavrou
- Laboratory of Cardiopulmonary Testing, Department of Respiratory Medicine, University of Thessaly, Larissa, Greece.
| | - Afroditi K Boutou
- Department of Respiratory Medicine, "G. Papanikolaou" General Hospital, Thessaloniki, Greece.
| | - George D Vavougios
- Department of Respiratory Medicine, University of Thessaly School of Medicine, University Hospital of Larissa, Greece; Department of Neurology, Athens Naval Hospital, Deinokratous 70, Athens, Greece.
| | - Chaido Pastaka
- Department of Respiratory Medicine, University of Thessaly School of Medicine, University Hospital of Larissa, Greece; Sleep Apnea Laboratory, Department of Respiratory Medicine, University of Thessaly, Larissa, Greece.
| | - Konstantinos I Gourgoulianis
- Laboratory of Cardiopulmonary Testing, Department of Respiratory Medicine, University of Thessaly, Larissa, Greece; Department of Respiratory Medicine, University of Thessaly School of Medicine, University Hospital of Larissa, Greece; Sleep Apnea Laboratory, Department of Respiratory Medicine, University of Thessaly, Larissa, Greece.
| | - Yiannis Koutedakis
- School of Physical Education and Sports Sciences, University of Thessaly, Trikala, Greece; Institute of Sport, Faculty of Education Health and Wellbeing, University of Wolverhampton, Walsall, UK.
| | - Zoe Daniil
- Laboratory of Cardiopulmonary Testing, Department of Respiratory Medicine, University of Thessaly, Larissa, Greece; Department of Respiratory Medicine, University of Thessaly School of Medicine, University Hospital of Larissa, Greece.
| | - Eleni Karetsi
- Laboratory of Cardiopulmonary Testing, Department of Respiratory Medicine, University of Thessaly, Larissa, Greece; Department of Respiratory Medicine, University of Thessaly School of Medicine, University Hospital of Larissa, Greece.
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14
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Impaired cerebral oxygenation and exercise tolerance in patients with severe obstructive sleep apnea syndrome. Sleep Med 2018; 51:37-46. [DOI: 10.1016/j.sleep.2018.06.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 06/25/2018] [Accepted: 06/27/2018] [Indexed: 11/19/2022]
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15
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Feng Y, Maislin D, Keenan BT, Gislason T, Arnardottir ES, Benediktsdottir B, Chirinos JA, Townsend RR, Staley B, Pack FM, Sifferman A, Pack AI, Kuna ST. Physical Activity Following Positive Airway Pressure Treatment in Adults With and Without Obesity and With Moderate-Severe Obstructive Sleep Apnea. J Clin Sleep Med 2018; 14:1705-1715. [PMID: 30353806 DOI: 10.5664/jcsm.7378] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Accepted: 06/22/2018] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES To examine the level of physical activity (PA) before and following positive airway pressure (PAP) treatment in adults who have obstructive sleep apnea (OSA) with obesity versus without obesity. METHODS Simultaneous waist accelerometer and wrist actigraphy recordings were obtained in 129 adults with obesity and 69 adults without obesity and who had OSA prior to and following 4 months of PAP therapy and in 52 patients in a control group. Primary PA measurements were average steps per day on waist accelerometry and average counts per minute (CPM) per day on wrist actigraphy. RESULTS At baseline, participants with obesity and OSA exhibited fewer steps per day on waist accelerometer and fewer CPM per day on wrist actigraphy compared to participants without obesity and with OSA (despite similar apnea-hypopnea index between groups). Following PAP treatment, participants with OSA had modestly increased CPM per day on wrist actigraphy (17.69 [95% confidence interval (CI), 5.67-29.71], P = .005) and increased light PA time (0.26 [95% CI, 0.07-0.44] hours, P = .008) on waist accelerometer. Participants without obesity and with OSA had greater improvements in PA measures on average compared to participants with obesity and OSA, although the differences were not statistically significant. Weight increased following PAP treatment in the participants with obesity and OSA (1.71 [95% CI, 0.41-3.02] kg, P = .010) but was unchanged in the group without obesity (0.93 [95% CI, -0.89 to 2.76] kg, P = .311). CONCLUSIONS Compared to study participants without obesity and with OSA, participants with obesity and OSA had reduced PA at baseline. PA increased significantly in participants without obesity, with OSA, and who were adherent to PAP treatment. Results indicate that treatment of OSA is unlikely to be associated with a change in PA in adults with obesity and OSA and help explain the absence of weight loss following PAP treatment in adults with OSA. CLINICAL TRIAL REGISTRATION Registry: ClinicalTrials.gov, title: The Effects of Treating Obese and Lean Patients With Sleep Apnea (PISA), identifier: NCT01578031, URL: https://clinicaltrials.gov/ct2/show/NCT01578031.
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Affiliation(s)
- Yuan Feng
- Sleep Medicine Center, Nanfang Hospital, Southern Medical University, Guangzhou, China.,Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - David Maislin
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Brendan T Keenan
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Thorarinn Gislason
- Department of Sleep, Landspitali - The National University Hospital of Iceland, Reykjavik, Iceland.,Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - Erna S Arnardottir
- Department of Sleep, Landspitali - The National University Hospital of Iceland, Reykjavik, Iceland.,Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - Bryndis Benediktsdottir
- Department of Sleep, Landspitali - The National University Hospital of Iceland, Reykjavik, Iceland.,Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - Julio A Chirinos
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Raymond R Townsend
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Bethany Staley
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Francis M Pack
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Andrea Sifferman
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Allan I Pack
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Samuel T Kuna
- Center for Sleep and Circadian Neurobiology, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Medicine, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania
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17
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MARILLIER MATHIEU, GRUET MATHIEU, BAILLIEUL SÉBASTIEN, LE ROUX MALLOUF THIBAULT, WUYAM BERNARD, TAMISIER RENAUD, LEVY PATRICK, PEPIN JEANLOUIS, VERGES SAMUEL. Neuromuscular Dysfunction and Cortical Impairment in Sleep Apnea Syndrome. Med Sci Sports Exerc 2018; 50:1529-1539. [DOI: 10.1249/mss.0000000000001625] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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18
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Brief Review: Ergospirometry in Patients with Obstructive Sleep Apnea Syndrome. J Clin Med 2018; 7:jcm7080191. [PMID: 30065219 PMCID: PMC6111535 DOI: 10.3390/jcm7080191] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Revised: 07/23/2018] [Accepted: 07/29/2018] [Indexed: 01/23/2023] Open
Abstract
This brief review summarizes the available literature on the intersection of obstructive sleep apnea syndrome (OSAS) and ergospirometry. Ergospirometry provides an assessment of integrative exercise responses involving pulmonary, cardiovascular, neuropsychological, and skeletal muscle systems, which are not adequately reflected through the measurement of individual organ system functions. Sleep disorders, including OSAS, often exacerbate problems in the operation of the autonomic nervous system, heart function, lung mechanics, anxiety, and muscle metabolism. Patients with OSAS have low aerobic capacity due to dysfunction of these systems, which often affect quality of sleep. Further research is necessary to elucidate the precise mechanisms through which ergospirometry can be useful in the assessment and early identification of patients with OSAS.
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Mendelson M, Marillier M, Bailly S, Flore P, Borel JC, Vivodtzev I, Doutreleau S, Tamisier R, Pépin JL, Verges S. Maximal exercise capacity in patients with obstructive sleep apnoea syndrome: a systematic review and meta-analysis. Eur Respir J 2018; 51:13993003.02697-2017. [PMID: 29700103 DOI: 10.1183/13993003.02697-2017] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Accepted: 04/13/2018] [Indexed: 01/27/2023]
Abstract
Maximal aerobic capacity is a strong health predictor and peak oxygen consumption (V'O2peak) is considered a reflection of total body health. No systematic reviews or meta-analyses to date have synthesised the existing data regarding V'O2peak in patients with obstructive sleep apnoea (OSA).A systematic review of English and French articles using PubMed/MEDLINE and Embase included studies assessing V'O2peak in OSA patients either in mL·kg-1·min-1 compared with controls or in % predicted. Two independent reviewers analysed the studies, extracted the data and assessed the quality of evidence.Mean V'O2peak expressed in mL·kg-1·min-1 was significantly lower in patients with OSA than in controls (mean difference -2.7 mL·kg-1·min-1; p<0.001; n=850). This reduction in V'O2peak was found to be larger in non-obese patients (body mass index <30 kg·m-2). Mean V'O2peak % pred was 89.9% in OSA patients (n=643).OSA patients have reduced maximal aerobic capacity, which can be associated with increased cardiovascular risks and reduced survival in certain patient subgroups. Maximal exercise testing can be useful to characterise functional limitation and to evaluate health status in OSA patients.
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Affiliation(s)
- Monique Mendelson
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France.,Both authors contributed equally and share the first authorship
| | - Mathieu Marillier
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France.,Both authors contributed equally and share the first authorship
| | - Sébastien Bailly
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France
| | - Patrice Flore
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France
| | - Jean-Christian Borel
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France
| | - Isabelle Vivodtzev
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France
| | - Stéphane Doutreleau
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France
| | - Renaud Tamisier
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France
| | - Jean-Louis Pépin
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France.,Both authors share senior authorship
| | - Samuel Verges
- HP2 Laboratory, University Grenoble Alpes, Grenoble, France.,Inserm U1042, Grenoble, France.,Grenoble Alps University Hospital, Grenoble, France.,Both authors share senior authorship
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Metoprolol prevents chronic obstructive sleep apnea-induced atrial fibrillation by inhibiting structural, sympathetic nervous and metabolic remodeling of the atria. Sci Rep 2017; 7:14941. [PMID: 29097705 PMCID: PMC5668297 DOI: 10.1038/s41598-017-14960-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 05/04/2017] [Indexed: 11/30/2022] Open
Abstract
Chronic obstructive sleep apnea (OSA) may promote the development of atrial fibrillation (AF) by inducing atrial electrical and structural remodeling as well as autonomic nerve hyperinnervation. Here, we investigated the roles of metoprolol in regulation of atrial remodeling induced by chronic OSA. A canine model of chronic OSA was established by stopping the ventilator and closing the airway for 4 h/day every other day for 12 weeks, while metoprolol (5 mg·kg-1·day-1) was continuously administered. Using that model, we observed that increases in sympathetic sprouting and atrial structural remodeling were sharply inhibited by metoprolol. Moreover, metoprolol dramatically inhibited the impairment of atrial energy metabolism by activating the Sirt1-AMPK pathway. In vitro, metoprolol significantly activated the Sirt1-AMPK pathway in intermittent hypoxic and isoproterenol-treated HL-1 cells, and the effect was abolished by the coadministration of EX-527, an inhibitor of Sirt1 activation. In summary, metoprolol protects against chronic OSA-induced atrial remodeling. Our results suggest a new and feasible treatment strategy for AF induced by OSA.
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Adimi Naghan P, Aloosh O, Torang HA, Malekmohammad M. Can 6-minute walk test predict severity of obstructive sleep apnea syndrome? SLEEP SCIENCE AND PRACTICE 2017. [DOI: 10.1186/s41606-017-0018-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Acute Feasibility of Neuromuscular Electrical Stimulation in Severely Obese Patients with Obstructive Sleep Apnea Syndrome: A Pilot Study. BIOMED RESEARCH INTERNATIONAL 2017; 2017:3704380. [PMID: 28194410 PMCID: PMC5282432 DOI: 10.1155/2017/3704380] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Revised: 12/06/2016] [Accepted: 12/22/2016] [Indexed: 01/10/2023]
Abstract
Objective. Obesity and obstructive sleep apnea (OSA) are closely interconnected conditions both leading to high cardiovascular risk. Inactivity is frequent and physical activity programs remain difficult in these patients. We investigated the acute feasibility of two neuromuscular electrical stimulation (NMES) modalities in extremely inactive obese patients with OSA. Design. A randomized cross-over study, with two experimental sessions (one per condition: multipath NMES versus conventional NMES). Setting. Outpatient research hospital. Subjects. Twelve patients with obesity, already treated for OSA. Interventions. No intervention. Measures. Feasibility outcomes included NMES current intensity, knee extension force evoked by NMES, and self-reported discomfort. Results. We found higher current intensity, a trend to significantly higher evoked force and lower discomfort during multipath NMES versus conventional NMES, suggesting better tolerance to the former NMES modality. However, patients were rapidly limited in the potential of increasing current intensity of multipath NMES. Conclusion. Both NMES modalities were feasible and relatively well tolerated by obese patients with OSA, even if multipath NMES showed a better muscle response/discomfort ratio than conventional NMES. There is an urgent need for a proof-of-concept study and interventional randomized controlled trials comparing NMES therapy versus current care to justify its utilization in obese and apneic patients with low physical activity levels.
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Quadri F, Boni E, Pini L, Bottone D, Venturoli N, Corda L, Tantucci C. Exercise tolerance in obstructive sleep apnea-hypopnea (OSAH), before and after CPAP treatment: Effects of autonomic dysfunction improvement. Respir Physiol Neurobiol 2016; 236:51-56. [PMID: 27840271 DOI: 10.1016/j.resp.2016.11.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 11/03/2016] [Accepted: 11/07/2016] [Indexed: 12/11/2022]
Abstract
BACKGROUND Obstructive sleep apnea hypopnea (OSAH) is associated with decreased exercise tolerance and autonomic abnormalities and represents a risk for cardiovascular diseases. The aim of the study was to evaluate the effects of CPAP on cardiovascular autonomic abnormalities and exercise performance in patients with OSAH without changes in lifestyle and body weight during treatment. METHODS Twelve overweight subjects with OSAH underwent anthropometric measures, autonomic cardiovascular and incremental symptom-limited cardio-respiratory exercise tests before and after two months of treatment with CPAP. RESULTS Lower frequency component of power spectrum of heart rate variability (59.5±24.2 msec2 vs 43.2±25.9 msec2; p<0.05) and improvements of maximal workload (99.3±13.5 vs 108.3±16.8%pred.; p<0.05) and peak oxygen consumption (95.3±7.6 vs 105.5±7.9%pred.; p<0.05) were observed in these patients after CPAP, being their BMI unchanged. CONCLUSIONS CPAP-induced decrease of sympathetic hyperactivity is associated with better tolerance to the effort in OSAH patients that did not change their BMI and lifestyle, suggesting that OSAH limits per se the exercise capacity.
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Affiliation(s)
- F Quadri
- Unit of Respiratory Medicine, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.
| | - E Boni
- Division of Internal Medicine, Spedali Civili of Brescia, P.zza Spedali Civili, 1, Brescia, Italy.
| | - L Pini
- Unit of Respiratory Medicine, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.
| | - D Bottone
- Unit of Respiratory Medicine, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.
| | - N Venturoli
- Unit of Respiratory Medicine, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.
| | - L Corda
- Division of Internal Medicine, Spedali Civili of Brescia, P.zza Spedali Civili, 1, Brescia, Italy.
| | - C Tantucci
- Unit of Respiratory Medicine, Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.
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Kline CE, Reboussin DM, Foster GD, Rice TB, Strotmeyer ES, Jakicic JM, Millman RP, Pi-Sunyer FX, Newman AB, Wadden TA, Zammit G, Kuna ST. The Effect of Changes in Cardiorespiratory Fitness and Weight on Obstructive Sleep Apnea Severity in Overweight Adults with Type 2 Diabetes. Sleep 2016; 39:317-25. [PMID: 26446118 DOI: 10.5665/sleep.5436] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 09/04/2015] [Indexed: 11/03/2022] Open
Abstract
STUDY OBJECTIVES To examine the effect of changes in cardiorespiratory fitness on obstructive sleep apnea (OSA) severity prior to and following adjustment for changes in weight over the course of a 4-y weight loss intervention. METHODS As secondary analyses of a randomized controlled trial, 263 overweight/obese adults with type 2 diabetes and OSA participated in an intensive lifestyle intervention or education control condition. Measures of OSA severity, cardiorespiratory fitness, and body weight were obtained at baseline, year 1, and year 4. Change in the apnea-hypopnea index (AHI) served as the primary outcome. The percentage change in fitness (submaximal metabolic equivalents [METs]) and change in weight (kg) were the primary independent variables. Primary analyses collapsed intervention conditions with statistical adjustment for treatment group and baseline METs, weight, and AHI among other relevant covariates. RESULTS At baseline, greater METs were associated with lower AHI (B [SE] = -1.48 [0.71], P = 0.038), but this relationship no longer existed (B [SE] = -0.24 [0.73], P = 0.75) after adjustment for weight (B [SE] = 0.31 [0.07], P < 0.0001). Fitness significantly increased at year 1 (+16.53 ± 28.71% relative to baseline), but returned to near-baseline levels by year 4 (+1.81 ± 24.48%). In mixed-model analyses of AHI change over time without consideration of weight change, increased fitness at year 1 (B [SE] = -0.15 [0.04], P < 0.0001), but not at year 4 (B [SE] = 0.04 [0.05], P = 0.48), was associated with AHI reduction. However, with weight change in the model, greater weight loss was associated with AHI reduction at years 1 and 4 (B [SE] = 0.81 [0.16] and 0.60 [0.16], both P < 0.0001), rendering the association between fitness and AHI change at year 1 nonsignificant (B [SE] = -0.04 [0.04], P = 0.31). CONCLUSIONS Among overweight/obese adults with type 2 diabetes, fitness change did not influence OSA severity change when weight change was taken into account. CLINICAL TRIAL REGISTRATION ClinicalTrials.gov identification number NCT00194259.
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Affiliation(s)
| | | | - Gary D Foster
- Temple University, Philadelphia, PA.,Weight Watchers International, New York, NY
| | | | | | | | | | | | | | | | | | - Samuel T Kuna
- University of Pennsylvania, Philadelphia PA.,Philadelphia Veterans Affairs Medical Center, Philadelphia, PA
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25
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Beitler JR, Awad KM, Bakker JP, Edwards BA, DeYoung P, Djonlagic I, Forman DE, Quan SF, Malhotra A. Obstructive sleep apnea is associated with impaired exercise capacity: a cross-sectional study. J Clin Sleep Med 2014; 10:1199-204. [PMID: 25325602 DOI: 10.5664/jcsm.4200] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 07/06/2014] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Obstructive sleep apnea (OSA) is associated with increased risk of adverse cardiovascular events. Because cardiopulmonary exercise testing (CPET) aids in prognostic assessment of heart disease, there is rising interest in its utility for cardiovascular risk stratification of patients with OSA. However, the relationship between OSA and exercise capacity is unclear. This study was conducted to test the hypothesis that OSA is associated with impaired exercise capacity. METHODS Fifteen subjects with moderate-to-severe OSA (apnea-hypopnea index [AHI] ≥15 events/h) and 19 controls with mild or no OSA (AHI <15 events/h) were enrolled. Subjects underwent standard polysomnography to determine AHI and exclude other sleep disorders. Resting metabolic rate was measured via indirect calorimetry, followed by maximum, symptom-limited CPET. Subjects completed a sleep diary and physical activity questionnaire characterizing behaviors in the week prior to testing. RESULTS Percent predicted peak oxygen uptake (V˙O2) was significantly lower in OSA subjects than controls (70.1%±17.5% vs 83.8%±13.9%; p = 0.02). Each 1-unit increase in log-transformed AHI was associated with a decrease in percent predicted peak V˙O2 of 3.20 (95% CI 0.53-5.88; p = 0.02). After adjusting for baseline differences, this association remained significant (p < 0.01). AHI alone explained 16.1% of the variability observed in percent predicted peak V˙O2 (p = 0.02). CONCLUSIONS OSA is associated with impaired exercise capacity. Further study is needed to evaluate the utility of CPET for prognostic assessment of patients with OSA.
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Affiliation(s)
- Jeremy R Beitler
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Karim M Awad
- Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA
| | - Jessie P Bakker
- Division of Sleep Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Bradley A Edwards
- Division of Sleep Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Pam DeYoung
- Division of Pulmonary and Critical Care Medicine, University of California, San Diego, San Diego, CA
| | - Ina Djonlagic
- Division of Sleep Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Daniel E Forman
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Stuart F Quan
- Division of Sleep Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA and Arizona Respiratory Center, University of Arizona College of Medicine, Tucson, AZ
| | - Atul Malhotra
- Division of Pulmonary and Critical Care Medicine, University of California, San Diego, San Diego, CA
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Mesarwi OA, Sharma EV, Jun JC, Polotsky VY. Metabolic dysfunction in obstructive sleep apnea: A critical examination of underlying mechanisms. Sleep Biol Rhythms 2014; 13:2-17. [PMID: 26412981 DOI: 10.1111/sbr.12078] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
It has recently become clear that obstructive sleep apnea (OSA) is an independent risk factor for the development of metabolic syndrome, a disorder of defective energy storage and use. Several mechanisms have been proposed to explain this finding, drawing upon the characteristics that define OSA. In particular, intermittent hypoxia, sleep fragmentation, elevated sympathetic tone, and oxidative stress - all consequences of OSA - have been implicated in the progression of poor metabolic outcomes in OSA. In this review we examine the evidence to support each of these disease manifestations of OSA as a unique risk for metabolic dysfunction. Tissue hypoxia and sleep fragmentation are each directly connected to insulin resistance and hypertension, and each of these also may increase sympathetic tone, resulting in defective glucose homeostasis, excessive lipolysis, and elevated blood pressure. Oxidative stress further worsens insulin resistance and in turn, metabolic dysfunction also increases oxidative stress. However, despite many studies linking each of these individual components of OSA to the development of metabolic syndrome, there are very few reports that actually provide a coherent narrative about the mechanism underlying metabolic dysfunction in OSA.
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Affiliation(s)
- Omar A Mesarwi
- Johns Hopkins University School of Medicine, Baltimore, Maryland
| | | | - Jonathan C Jun
- Johns Hopkins University School of Medicine, Baltimore, Maryland
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27
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Evans CA, Selvadurai H, Baur LA, Waters KA. Effects of obstructive sleep apnea and obesity on exercise function in children. Sleep 2014; 37:1103-10. [PMID: 24882905 DOI: 10.5665/sleep.3770] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
STUDY OBJECTIVES Evaluate the relative contributions of weight status and obstructive sleep apnea (OSA) to cardiopulmonary exercise responses in children. DESIGN Prospective, cross-sectional study. Participants underwent anthropometric measurements, overnight polysomnography, spirometry, cardiopulmonary exercise function testing on a cycle ergometer, and cardiac doppler imaging. OSA was defined as ≥ 1 obstructive apnea or hypopnea per hour of sleep (OAHI). The effect of OSA on exercise function was evaluated after the parameters were corrected for body mass index (BMI) z-scores. Similarly, the effect of obesity on exercise function was examined when the variables were adjusted for OAHI. SETTING Tertiary pediatric hospital. PARTICIPANTS Healthy weight and obese children, aged 7-12 y. INTERVENTIONS N/A. MEASUREMENTS AND RESULTS Seventy-one children were studied. In comparison with weight-matched children without OSA, children with OSA had a lower cardiac output, stroke volume index, heart rate, and oxygen consumption (VO2 peak) at peak exercise capacity. After adjusting for BMI z-score, children with OSA had 1.5 L/min (95% confidence interval -2.3 to -0.6 L/min; P = 0.001) lower cardiac output at peak exercise capacity, but minute ventilation and ventilatory responses to exercise were not affected. Obesity was only associated with physical deconditioning. Cardiac dysfunction was associated with the frequency of respiratory-related arousals, the severity of hypoxia, and heart rate during sleep. CONCLUSIONS Children with OSA are exercise limited due to a reduced cardiac output and VO2 peak at peak exercise capacity, independent of their weight status. Comorbid OSA can further decrease exercise performance in obese children.
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Affiliation(s)
- Carla A Evans
- The Children's Hospital at Westmead Clinical School, Discipline of Paediatrics & Child Health, Faculty of Medicine, The University of Sydney NSW Australia
| | - Hiran Selvadurai
- The Children's Hospital at Westmead Clinical School, Discipline of Paediatrics & Child Health, Faculty of Medicine, The University of Sydney NSW Australia ; The Department of Respiratory Medicine, The Children's Hospital at Westmead, Westmead NSW Australia
| | - Louise A Baur
- The Children's Hospital at Westmead Clinical School, Discipline of Paediatrics & Child Health, Faculty of Medicine, The University of Sydney NSW Australia ; Weight Management Service, The Children's Hospital at Westmead, Westmead NSW Australia
| | - Karen A Waters
- The Children's Hospital at Westmead Clinical School, Discipline of Paediatrics & Child Health, Faculty of Medicine, The University of Sydney NSW Australia ; The Department of Respiratory Medicine, The Children's Hospital at Westmead, Westmead NSW Australia
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28
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Vanhecke TE, Franklin BA, Ajluni SC, Sangal RB, McCullough PA. Cardiorespiratory fitness and sleep-related breathing disorders. Expert Rev Cardiovasc Ther 2014; 6:745-58. [DOI: 10.1586/14779072.6.5.745] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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29
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Strohl KP, Butler JP, Malhotra A. Mechanical properties of the upper airway. Compr Physiol 2013; 2:1853-72. [PMID: 23723026 DOI: 10.1002/cphy.c110053] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The importance of the upper airway (nose, pharynx, and larynx) in health and in the pathogenesis of sleep apnea, asthma, and other airway diseases, discussed elsewhere in the Comprehensive Physiology series, prompts this review of the biomechanical properties and functional aspects of the upper airway. There is a literature based on anatomic or structural descriptions in static circumstances, albeit studied in limited numbers of individuals in both health and disease. As for dynamic features, the literature is limited to studies of pressure and flow through all or parts of the upper airway and to the effects of muscle activation on such features; however, the links between structure and function through airway size, shape, and compliance remain a topic that is completely open for investigation, particularly through analyses using concepts of fluid and structural mechanics. Throughout are included both historically seminal references, as well as those serving as signposts or updated reviews. This article should be considered a resource for concepts needed for the application of biomechanical models of upper airway physiology, applicable to understanding the pathophysiology of disease and anticipated results of treatment interventions.
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Affiliation(s)
- Kingman P Strohl
- Center for Sleep Disorders Research, Division of Pulmonary, Critical Care, and Sleep Medicine, Case Western Reserve University, Cleveland, Ohio, USA.
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30
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Damianidou L, Eboriadou M, Giannopoulos A, Haidopoulou K, Markou K, Tzimou I, Kirvasilis F, Kontouli K, Tsanakas I, Athanassiadou F. Reduced exercise capacity in Greek children with mild to moderate obstructive sleep apnea syndrome. Pediatr Pulmonol 2013. [PMID: 23192889 DOI: 10.1002/ppul.22730] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Obstructive sleep apnea syndrome (OSAS) is a common disease that is increasingly recognized among pediatric population. The exercise capacity of adults with OSAS has been demonstrated to be impaired, but there are no data about pediatric exercise response. AIM The aim of this study was to evaluate cardiopulmonary response to exercise in children with OSAS and to correlate exercise capacity and severity of OSAS. METHODS Twenty-seven children with habitual snoring (Group A) (mean age 10.5 ± 1.8 years) referred for overnight polysomnography and 13 apparently healthy controls (mean age 11 ± 1.5 years) were recruited. According to the apnea hypopnea index (AHI) group A consisted of 15 (55.6%) children with mild OSAS and 12 (44.4%) with moderate-severe OSAS. All children completed a maximal ramping cardiopulmonary exercise test (CPET) on cycle ergometer. RESULTS According to CPET children with OSAS had significantly lower VO2max (40.3 ± 8.4 ml/kg/min vs. 47.6 ± 7.9 ml/kg/min, P = 0.013) significantly lower VO2max (%) (77.7 ± 15 vs. 92.9 ± 10.5, P = 0.002), lower maximum heart-rate at peak exercise (86.6 ± 8.8 beat/min vs. 90.6 ± 7.2 beat/min) and higher systolic blood pressure level at peak exercise (145 ± 27.4 mmHg vs. 143.92 ± 20 mmHg) compared to control group. CONCLUSION The present study demonstrates that young patients with OSAS, even with mild OSAS, had reduced exercise capacity as compared to control group.
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Affiliation(s)
- Labrini Damianidou
- 2nd Pediatric Department, School of Medicine, Aristotle University of Thessaloniki, AHEPA Hospital, Thessaloniki, Greece
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31
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Functional aerobic capacity in patients with sleep-disordered breathing. Am J Cardiol 2013; 111:1650-4. [PMID: 23578347 DOI: 10.1016/j.amjcard.2013.02.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 02/05/2013] [Accepted: 02/05/2013] [Indexed: 11/21/2022]
Abstract
Few studies have examined exercise capacity or cardiovascular responses to maximal exercise testing and recovery in patients with sleep-disordered breathing (SDB), and results from these studies are conflicting. The objective of this cross-sectional study conducted at a tertiary referral center was to examine the association between SDB and exercise testing outcomes independent of body mass index (BMI) and other cardiopulmonary risk factors. Between January 1, 2005 and January 1, 2010, 1,424 adults underwent exercise testing and within 6 months before first-time diagnostic polysomnography. Subjects were categorized by apnea-hypopnea index (AHI) into 4 groups: <5, 5 to 14, 15 to 29, and ≥30. A logistic regression model incorporated age, gender, BMI, smoking, hypertension, diabetes, beta-blocker use, and cardiac and pulmonary disease as covariates. The primary variable of interest was functional aerobic capacity (FAC). Mean age was 56.4 ± 12.4 years; 75% were men. Mean BMI was 32.4 ± 7.1 kg/m², and mean AHI 19.5 ± 22.1 per hour. On multivariate analysis, AHI as a continuous variable showed a negative correlation with FAC (R²adj = 0.30, p <0.001) and postexercise SBP (R²adj = 0.23, p = 0.03), and positively correlated with resting and peak DBP (R²adj = 0.09, p = 0.01 and R²adj = 0.09, p = 0.04 respectively). When comparing patients with severe SDB (AHI ≥30) with those without SDB (AHI <5), FAC and heart rate recovery were significantly lower, and resting, peak, and postexercise DBP were higher in those with severe apnea (all p <0.05), after accounting for confounders. In conclusion, SDB severity was associated with reduced FAC and increased resting and peak DBP. Even after accounting for confounders, severe SDB was associated with attenuated FAC, impaired heart rate recovery, and higher resting, peak, and postexercise DBP.
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32
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Billings CG, Aung T, Renshaw SA, Bianchi SM. Incremental shuttle walk test in the assessment of patients with obstructive sleep apnea-hypopnea syndrome. J Sleep Res 2013; 22:471-7. [DOI: 10.1111/jsr.12037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 01/07/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Catherine G. Billings
- Respiratory Medicine; Sheffield Teaching Hospitals NHS Foundation Trust; Sheffield UK
| | - Thida Aung
- Respiratory Medicine; Sheffield Teaching Hospitals NHS Foundation Trust; Sheffield UK
| | - Stephen A. Renshaw
- Academic Unit of Respiratory Medicine; Department of Infection and Immunity; University of Sheffield Medical School; Sheffield UK
| | - Stephen M. Bianchi
- Respiratory Medicine; Sheffield Teaching Hospitals NHS Foundation Trust; Sheffield UK
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Hargens TA, Kaleth AS, Edwards ES, Butner KL. Association between sleep disorders, obesity, and exercise: a review. Nat Sci Sleep 2013; 5:27-35. [PMID: 23620691 PMCID: PMC3630986 DOI: 10.2147/nss.s34838] [Citation(s) in RCA: 130] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Decreased sleep duration and quality is associated with an increase in body weight and adiposity. Insomnia, obstructive sleep apnea, and restless legs syndrome are three of the most prevalent types of sleep disorder that lead to an increased risk for numerous chronic health conditions. Various studies have examined the impact of these sleep disorders on obesity, and are an important link in understanding the relationship between sleep disorders and chronic disease. Physical activity and exercise are important prognostic tools in obesity and chronic disease, and numerous studies have explored the relationship between obesity, sleep disorders, and exercise. As such, this review will examine the relationship between sleep disorders and obesity. In addition, how sleep disorders may impact the exercise response and how exercise may impact patient outcomes with regard to sleep disorders will also be reviewed.
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Affiliation(s)
- Trent A Hargens
- Department of Kinesiology, James Madison University, Harrisonburg, VA, USA
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34
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Blunted heart rate recovery is improved following exercise training in overweight adults with obstructive sleep apnea. Int J Cardiol 2012; 167:1610-5. [PMID: 22572632 DOI: 10.1016/j.ijcard.2012.04.108] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Revised: 03/21/2012] [Accepted: 04/16/2012] [Indexed: 11/23/2022]
Abstract
BACKGROUND Obstructive sleep apnea (OSA) predisposes individuals to cardiovascular morbidity, and cardiopulmonary exercise test (CPET) markers prognostic for cardiovascular disease have been found to be abnormal in adults with OSA. Due to the persistence of OSA and its cardiovascular consequences, whether the cardiovascular adaptations normally conferred by exercise are blunted in adults not utilizing established OSA treatment is unknown. The aims of this study were to document whether OSA participants have abnormal CPET responses and determine whether exercise modifies these CPET markers in individuals with OSA. METHODS The CPET responses of 43 sedentary, overweight adults (body mass index [BMI]>25) with untreated OSA (apnea-hypopnea index [AHI]≥ 15) were compared against matched non-OSA controls (n=9). OSA participants were then randomized to a 12-week exercise training (n=27) or stretching control treatment (n=16), followed by a post-intervention CPET. Measures of resting, exercise, and post-exercise recovery heart rate (HRR), blood pressure, and ventilation, as well as peak oxygen consumption (VO(2peak)), were obtained. RESULTS OSA participants had blunted HRR compared to non-OSA controls at 1 (P=.03), 3 (P=.02), and 5-min post-exercise (P=.03). For OSA participants, exercise training improved VO2 peak (P=.04) and HRR at 1 (P=.03), 3 (P<.01), and 5-min post-exercise (P<.001) compared to control. AHI change was associated with change in HRR at 5-min post-exercise (r=-.30, P<.05), but no other CPET markers. CONCLUSIONS These results suggest that individuals with OSA have autonomic dysfunction, and that exercise training, by increasing HRR and VO2 peak, may attenuate autonomic imbalance and improve functional capacity independent of OSA severity reduction.
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35
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Pendharkar SR, Tsai WH, Eves ND, Ford GT, Davidson WJ. CPAP increases exercise tolerance in obese subjects with obstructive sleep apnea. Respir Med 2011; 105:1565-71. [DOI: 10.1016/j.rmed.2011.06.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2011] [Accepted: 06/16/2011] [Indexed: 11/26/2022]
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36
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Tonini J, Michallet AS, Flore P, Nespoulet H, Pepin JL, Wuyam B, Levy P, Tamisier R. Effect of chronic intermittent hypoxia on exercise adaptations in healthy subjects. Respir Physiol Neurobiol 2011; 179:287-93. [PMID: 21930252 DOI: 10.1016/j.resp.2011.09.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Revised: 09/07/2011] [Accepted: 09/08/2011] [Indexed: 10/17/2022]
Abstract
Reduced exercise tolerance has been reported in obstructive sleep apnea syndrome (OSAS) patients, although the associated hypertension, obesity and/or metabolic disorder may underlie this reduction. Therefore, we evaluated the effects of chronic intermittent hypoxia (CIH) in 12 healthy subjects on exercise capacity, cardio-respiratory responses, and substrate oxidation during maximal and sub-maximal exercise. Subjects were exposed to 30 cycles of hypoxia-reoxygenation per hour for 14 nights. Although exercise capacity was unaltered PETCO(2) was reduced and V˙E/V˙CO(2) increased during both maximal and submaximal exercise tests, indicating a hyperventilatory response. Maximal heart rate was lower and diastolic arterial blood pressure (DBP) was higher in the 1st min of recovery after submaximal exercise. Subjects reached maximal lipid oxidation at a higher power output and had decreased blood lactate for a given power output. This suggests that although the metabolic adaptations to CIH in healthy subjects may improve exercise performance, the cardio-pulmonary modifications are similar to those observed in OSAS patients and could limit exercise capacity.
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37
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Rizzi CF, Cintra F, Risso T, Pulz C, Tufik S, de Paola A, Poyares D. Exercise Capacity and Obstructive Sleep Apnea in Lean Subjects. Chest 2010; 137:109-14. [DOI: 10.1378/chest.09-1201] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Nanas S, Sakellariou D, Kapsimalakou S, Dimopoulos S, Tassiou A, Tasoulis A, Anastasiou‐Nana M, Vagiakis E, Roussos C. Heart rate recovery and oxygen kinetics after exercise in obstructive sleep apnea syndrome. Clin Cardiol 2010; 33:46-51. [PMID: 20063292 PMCID: PMC6653309 DOI: 10.1002/clc.20707] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Patients who suffer from obstructive sleep apnea (OSA) have a decreased exercise capacity and abnormal autonomic nervous function. However, the kinetics of early oxygen (O2) and heart rate recovery (HRR) have not been described. MATERIALS AND METHODS We evaluated 21 men with moderate to severe OSA (mean age: 48 +/- 11 yrs, mean apnea-hypopnea index [AHI]: 55 +/- 13) and without known heart disease and 10 healthy men matched for age and body mass index (BMI; controls). Men with OSA underwent overnight polysomnography, and both groups underwent symptom-limited incremental cardiopulmonary exercise testing (CPET). We recorded the CPET parameters including peak O2 uptake (VO2p), kinetics of early O2 recovery by the first degree slope of VO2 during the first minute (VO2/t slope), the time required for a 50% decline of VO2p during recovery (T(1/2)), and early heart rate recovery (HRR = HR at maximal exercise - HR at 1 min of recovery), as well as the chronotropic reserve to exercise ([CR] = [peak HR - resting HR/220 - age - resting HR] x 100). Patients with OSA had a lower VO2p (28.7 +/- 4.0 vs 34.7 +/- 6.2 mL/kg/min), VO2/t slope (1.04 +/- 0.3 vs 1.4 +/- 0.17 mL/kg/min2), and T(1/2) (74 +/- 10 vs 56 +/- 6 sec) compared to controls (all P < 0.001). In addition, both HRR and CR were lower in the OSA group (22.0 +/- 7.0 vs 31.0 +/- 6.0 bpm, P:0.003, and 79.0% +/- 15% vs 99.0% +/- 13.0%, P:0.01, respectively). CONCLUSIONS Patients with OSA demonstrate reduced exercise capacity, delayed oxygen kinetics, and reduced HRR. These data point to abnormal oxygen delivery and/or oxidative function of the peripheral muscles and impaired autonomic nervous activity in OSA patients.
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Affiliation(s)
- Serafim Nanas
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
| | - Dimitrios Sakellariou
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
| | - Smaragda Kapsimalakou
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
| | - Stavros Dimopoulos
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
| | - Antonia Tassiou
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
| | - Athanasios Tasoulis
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
| | - Maria Anastasiou‐Nana
- Clinical Therapeutics Department, National and Kapodestrian University of Athens, Athens, Greece
| | - Emmanouil Vagiakis
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
| | - Charalampos Roussos
- Pulmonary and Critical Care Medicine Department, Cardiopulmonary Exercise Testing and Rehabilitation and Sleep Laboratories, National and Kapodestrian University of Athens, Athens, Greece
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Alameri H, Al-Kabab Y, BaHammam A. Submaximal exercise in patients with severe obstructive sleep apnea. Sleep Breath 2009; 14:145-51. [PMID: 19779938 DOI: 10.1007/s11325-009-0300-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2009] [Accepted: 09/03/2009] [Indexed: 10/20/2022]
Abstract
PURPOSE Several studies have used the cardiopulmonary exercise test to assess patients with obstructive sleep apnea (OSA). However, no report has investigated the use of the 6-min walk test (6MWT) in this group of patients. METHODS We studied consecutive, newly diagnosed, OSA patients (aged >18 years). The control group was composed of matched healthy subjects with no clinical history indicative of sleep breathing disorders. The study population was divided into three groups: an OSA group, a control obese group, and a control lean group. The obese controls were gender-, age- (+/-2 years), height- (+/-5 cm), and weight- (+/-2 kg) matched to the OSA patients, while the lean controls were matched in gender, age, and height, but not weight. All patients underwent sleep study at our Sleep Disorders Center. Each subject underwent a single 6MWT within 1 week of the sleep study. RESULTS A total of 55 patients were recruited to the OSA group (age 36.7 +/- 7.9 years, body mass index 38.7 +/- 8.6 kg/m(2), and apnea hypopnea index 66.6 +/- 34.8/h), 32 subjects to the control obese group, and 30 to the control lean group. There was no difference in distance walked (6-min walk distance (6MWD)) between the OSA group (389 +/- 70 m) and the obese group (408 +/- 66 m). In the OSA group, the 6MWD results did not correlate with patient age, apnea hypopnea index, or other polysomnographic variables. At the end of the test, heart rate, systolic and diastolic blood pressure, and dyspnea perception were significantly increased in the OSA group compared with healthy subjects. CONCLUSIONS The 6MWT is easy to perform and well tolerated by patients with OSA. There were no correlations between the 6MWD and the severity of OSA or other polysomnographic parameters. However, patients with OSA exhibited abnormal hemodynamic responses to submaximal exercise.
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Affiliation(s)
- Hatem Alameri
- Pulmonary Division and Pulmonary Physiology Laboratory, College of Medicine, King Saud University, Riyadh, Saudi Arabia
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Abstract
BACKGROUND Lactate may be useful in pointing out the higher risk subgroups in sleep-related breathing disorders (SRBD) with various patterns of hypoxemia. We aimed to search whether morning and night lactate levels are related to apnea-hypopnea, hypoventilation, and hypoxemia in patients with SRBD and to compare it with patients without SRBD (No-SRBD). METHODS Eighty patients with suspected SRBD underwent polysomnography (PSG) testing. SRBD patients had obstructive sleep apnea syndrome with or without sleep-related hypoventilation/hypoxemic conditions. Patients without SRBD were in the control group. Measurements included pulmonary function testing, PSG, analysis of arterial blood gases, and arterial lactate before and after PSG. Arterial lactate was compared with SRBD and No-SRBD patients. RESULTS Morning lactate was significantly higher in the SRBD group than the No-SRBD group (1.65 +/- 0.48 and 1.35 +/- 0.57 mmol/L, respectively) (P = 0.003). Lactate levels at night and the change overnight in lactate levels were not significantly different between groups. After an adjustment for age, gender, and body mass index, lactate levels before PSG were related to the apnea-hypopnea index (beta: 0.004, 95% CI: 0.000-0.008) and the rate of sleep-time spent under 90% oxygen saturation (T90%). The following morning lactate level was correlated with the T90% (beta: 0.005, 95% CI: 0.000-0.010). After an adjustment for lactate levels before PSG, lactate in the morning was correlated with T90% (beta: 0.004, 95% CI: 0.000-0.008). CONCLUSION As a marker of tissue hypoxia, arterial lactate may be used to assess the severity of SRBD.
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Schmoller A, Eberhardt F, Jauch-Chara K, Schweiger U, Zabel P, Peters A, Schultes B, Oltmanns KM. Continuous positive airway pressure therapy decreases evening cortisol concentrations in patients with severe obstructive sleep apnea. Metabolism 2009; 58:848-53. [PMID: 19375124 DOI: 10.1016/j.metabol.2009.02.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2007] [Accepted: 02/13/2009] [Indexed: 11/17/2022]
Abstract
Patients with obstructive sleep apnea syndrome (OSAS) show recurrent episodes of nightly hypoxic stress. The purpose of this study is the detection of alterations of the hypothalamic-pituitary-adrenal stress axis in OSAS patients before and after continuous positive airway pressure (CPAP) therapy. An activation of the hypothalamic-pituitary-adrenal axis was proposed because of the nightly hypoxic stress in these patients, but previous studies were not conclusive. Here we hypothesize that CPAP therapy decreases salivary cortisol concentrations in patients with severe OSAS. We performed a clinical within-subject study including 50 patients with newly diagnosed OSAS and an apnea-hypopnea index greater than or equal to 40 h(-1). Diurnal profiles of salivary cortisol concentrations were compiled before and after 3 months of treatment with CPAP. Therefore, 6 cortisol samples were collected: before and after lunch, in the evening, the next morning after awakening, and before and after breakfast. Thirty-eight patients returned after 3 months of CPAP therapy for follow-up. According to the reference range for healthy subjects, cortisol values were not pathologically increased. Analysis of variance revealed a significant effect of CPAP therapy on diurnal cortisol profiles (P = .048). Subjects with severe OSAS showed a decrease (3.04 +/- 0.55 nmol L(-1) pre-CPAP vs 2.48 +/- 0.78 nmol L(-1) post-CPAP, P = .038) of evening cortisol levels after CPAP treatment, whereas prelunch levels were increased after CPAP therapy (7.18 +/- 0.83 nmol L(-1) pre-CPAP vs 10.22 +/- 1.10 nmol L(-1) post-CPAP, P = .044). Our results show that CPAP therapy decreases evening cortisol concentrations in patients with severe OSAS. These data suggest that OSAS may increase the cortisol nadir that is reversed after CPAP therapy.
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Affiliation(s)
- Andre Schmoller
- Department of Psychiatry and Psychotherapy, University of Luebeck, D-23538 Germany.
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Altered ventilatory responses to exercise testing in young adult men with obstructive sleep apnea. Respir Med 2009; 103:1063-9. [PMID: 19217270 DOI: 10.1016/j.rmed.2009.01.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Revised: 01/06/2009] [Accepted: 01/14/2009] [Indexed: 11/23/2022]
Abstract
BACKGROUND Obstructive sleep apnea (OSA) is a disorder characterized by repetitive obstructions of the upper airway. Individuals with OSA experience intermittent hypoxia, hypercapnia, and arousals during sleep, resulting in increased sympathetic activation. Chemoreflex activation, arising from the resultant oscillatory disturbances in blood gases from OSA, exerts control over ventilation, and may induce increases in sympathetic vasoconstriction, contributing to increased long-term risks for hypertension (HTN) and cardiovascular disease (CVD). METHODS To evaluate whether OSA elicits exaggerated ventilatory responses to exercise in young men, 14 overweight men with OSA and 16 overweight men without OSA performed maximal ramping cycle ergometer exercise tests. Oxygen consumption (VO(2)), ventilation, (V(E)), ventilatory equivalents for oxygen (V(E)/VO(2)) and carbon dioxide (V(E)/VCO(2)), and V(E)/VCO(2) slope were measured. RESULTS The VO(2) response to exercise did not differ between groups. The V(E), V(E)/VCO(2), V(E)/VO(2) were higher (p< 0.05, 0.002, and p<0.02, respectively) in the OSA group across all workloads. The V(E)/VCO(2) slope was greater in the OSA group (p<0.05). The V(E)/VCO(2) slope and AHI were significantly correlated (r=0.56, p<0.03). Thus, young, overweight men with OSA exhibit increased ventilatory responses to exercise when compared to overweight controls. This may reflect alterations in chemoreflex sensitivity, and contribute to increased sympathetic drive and HTN risk.
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Aron A, Zedalis D, Gregg JM, Gwazdauskas FC, Herbert WG. Potential clinical use of cardiopulmonary exercise testing in obstructive sleep apnea hypopnea syndrome. Int J Cardiol 2008; 132:176-86. [PMID: 19042045 DOI: 10.1016/j.ijcard.2008.11.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 11/01/2008] [Indexed: 11/29/2022]
Abstract
There is growing evidence linking obstructive sleep apnea hypopnea syndrome (OSAHS) with multiple cardiovascular and metabolic diseases. Exercise testing is generally available and routinely used to provide valuable information on cardiopulmonary function in healthy and diseased populations. This review summarizes and integrates recent findings on exercise testing in OSAHS and discusses the potential mechanisms that may contribute to the responses that seem to differentiate these patients from apparently healthy subjects and patients with other cardiopulmonary diseases. Although exercise testing is widely used in the evaluation and diagnosis of coronary artery disease patients, recent studies showed distinctive cardiopulmonary responses in OSAHS that raise the possibility of similar applications in this disorder, as well. Several studies illustrated in this review found that OSAHS patients have a reduced exercise capacity, as shown by low peak oxygen uptake achieved. Also, their exercise HR response was reported as significantly lower than in healthy peers, suggesting chronotropic incompetence. Exercise blood pressure response were atypical as well. OSAHS patients had increased systolic and diastolic BP during exercise and a persistently elevated systolic BP during the early post-exercise recovery period. Possible explanations for these responses include cardiac dysfunction, impaired muscle metabolism, chronic sympathetic over-activation, and endothelial dysfunction. Early identification of OSAHS using cardiopulmonary exercise testing (CPXT) shows promise for selecting patients at risk for this disorder in the clinical setting. A uniform definition and measurement of OSAHS together with more rigorous trials are necessary to establish the utility of exercise responses in clinical settings.
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Affiliation(s)
- Adrian Aron
- Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States.
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Ucok K, Aycicek A, Sezer M, Genc A, Akkaya M, Caglar V, Fidan F, Unlu M. Aerobic and anaerobic exercise capacities in obstructive sleep apnea and associations with subcutaneous fat distributions. Lung 2008; 187:29-36. [PMID: 19023624 DOI: 10.1007/s00408-008-9128-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Accepted: 10/23/2008] [Indexed: 11/27/2022]
Abstract
Obesity is a strong risk factor for the development and progression of sleep apnea. Responses to exercise by patients with obstructive sleep apnea syndrome (OSAS) are clinically relevant to reducing body weight and cardiovascular risk factors. This study aimed to clarify the aerobic and anaerobic exercise capacities and their possible relationships with other findings in patients with OSAS. Forty patients (30 males, 10 females) and 40 controls (30 males, 10 females) were enrolled in this study. Questionnaires (excessive daytime sleepiness, daytime tiredness, morning headache, waking unrefreshed, and imbalance), overnight polysomnography, indirect laryngoscopy, and aerobic and anaerobic exercise tests were performed. Triceps, subscapular, abdomen, and thigh skinfold thicknesses were measured. Subcutaneous abdominal fat (abdomen skinfold) was significantly higher in OSAS patients than in controls. Maximal anaerobic power and anaerobic capacity were not different significantly between the patients and controls. We found that aerobic capacity was significantly lower in OSAS patients than in controls. Aerobic capacity was negatively correlated with upper-body subcutaneous fat (triceps and subscapular skinfolds) but not correlated with subcutaneous abdominal fat in OSAS patients. In multivariate analyses using all patients, the apnea-hypopnea index remained a significant independent predictor of aerobic capacity after controlling for a variety of potential confounders including body mass index. Our data confirm that central obesity (subcutaneous abdominal fat) is prominent in patients with OSAS. Our results suggest that lower aerobic exercise capacity in patients with OSAS might be due to daily physical activity that is restricted by OSA itself. This study also suggests that the degree of subcutaneous abdominal fat cannot be used for predicting aerobic capacity level. We think that upper-body subcutaneous fat might be suitable for determining the physical fitness of patients with OSAS.
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Affiliation(s)
- Kagan Ucok
- A.K.U. Tip Fakultesi, Pembe Hastane, Fizyoloji AD, Konya Caddesi Karayollari Kavsagi, 03040 Afyonkarahisar, Turkey.
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Mueller PDTG, Gomes MD, Viegas CADA, Neder JA. Efeitos sistêmicos da hipoxemia noturna em pacientes com doença pulmonar obstrutiva crônica sem síndrome da apnéia obstrutiva do sono. J Bras Pneumol 2008; 34:567-74. [DOI: 10.1590/s1806-37132008000800005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2007] [Accepted: 11/05/2007] [Indexed: 11/22/2022] Open
Abstract
OBJETIVO: Estudar os efeitos da hipoxemia noturna em pacientes com doença pulmonar obstrutiva crônica sem síndrome da apnéia obstrutiva do sono. MÉTODOS: Estudamos 21 pacientes-10 dessaturadores e 11 não-dessaturadores-submetidos a gasometria arterial, polissonografia, espirometria, teste de exercício cardiopulmonar (cicloergômetro), dinamometria manual e medidas de pressão inspiratória máxima, pressão expiratória máxima e proteína C reativa (PCR). Incluíram-se os pacientes com pressão parcial arterial de oxigênio > 60 mmHg; excluíram-se os com índice de apnéia-hipopnéia > 5 eventos/hora de sono. Foram medidos consumo máximo de oxigênio, potência máxima, pressão arterial sistólica, pressão arterial diastólica (PAD) e frequência cardíaca máxima durante exercício, visando detectar alterações hemodinâmicas. A PCR foi considerada positiva quando acima de 3 mg/L. RESULTADOS: A saturação periférica de oxigênio mínima durante o sono foi significativamente maior nos não-dessaturadores (p = 0,03). Mais dessaturadores apresentaram PCR > 3 mg/L (p < 0,05). Não houve diferença quanto a capacidade de exercício e demais variáveis. No entanto, PAD (p < 0,001) e pressão inspiratória máxima (p = 0,001) correlacionaram-se com saturação periférica de oxigênio média durante o sono. CONCLUSÕES: A hipoxemia noturna não reduz a capacidade de exercício e a força de preensao manual em pacientes com DPOC leve/moderada, mas o ajuste da PAD durante o exercício máximo parece depender do grau de hipoxemia. Além disso, há uma relação positiva entre pressão inspiratória máxima e saturação periférica de oxigênio média durante o sono, bem como indícios de ativação inflamatória diferenciada em pacientes com hipoxemia noturna.
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Hargens TA, Guill SG, Zedalis D, Gregg JM, Nickols-Richardson SM, Herbert WG. Attenuated heart rate recovery following exercise testing in overweight young men with untreated obstructive sleep apnea. Sleep 2008; 31:104-10. [PMID: 18220083 PMCID: PMC2225551 DOI: 10.1093/sleep/31.1.104] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
STUDY OBJECTIVE To evaluate whether cardiovascular responses to maximal exercise testing and recovery are altered with obstructive sleep apnea (OSA) in overweight young adult men. DESIGN Three sedentary subject groups were recruited: Overweight with OSA (OSA), overweight without OSA (No-OSA), and normal weight without OSA (Control). Presence of OSA was screened via portable diagnostic device. Body composition was measured with dual-energy X-ray absorptiometry. Subjects performed maximal ramping exercise testing (RXT) on a cycle ergometer with 5 minutes of active recovery. Exercise measurements included heart rate (HR), blood pressure (BP), respiratory exchange ratio (RER), and oxygen consumption (VO2). Recovery HR was converted to a HR difference (HR(diff)) calculation (HR(peak) - HR(each minute recovery)), and BP was converted to a recovery ratio for each minute. SETTING The study was carried out on the campus of Virginia Tech, Department of Human Nutrition, Foods, and Exercise, Blacksburg, Virginia. PARTICIPANTS 14 OSA, 16 No-OSA, and 14 Control volunteers. INTERVENTION N/A. MEASUREMENTS AND RESULTS In OSA subjects, HR recovery was significantly attenuated compared to the No-OSA and Control groups throughout recovery (P = 0.009). No differences were noted in the HR or BP response to exercise in any group. The VO2, adjusted for fat-free soft tissue mass, did not differ between groups. CONCLUSIONS We found that OSA elicits alterations in the cardiovascular response post exercise, reflected by an attenuated HR recovery. This may indicate an imbalance in the autonomic regulation of HR. Exercise tests may provide utility in risk stratification for those at risk for OSA.
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Affiliation(s)
- Trent A. Hargens
- Laboratory for Health and Exercise Science, Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA
- Human Performance Laboratory, Clinical Exercise Physiology Program, Ball State University, Muncie, IN
| | - Stephen G. Guill
- Laboratory for Health and Exercise Science, Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA
- Edward Via Virginia College of Osteopathic Medicine, Blacksburg, VA
| | - Donald Zedalis
- Sleep Disorders Network of Southwest Virginia, Christiansburg, VA
| | - John M. Gregg
- Sleep Disorders Network of Southwest Virginia, Christiansburg, VA
- Health Research Group, LLC, Blacksburg, VA
| | | | - William G. Herbert
- Laboratory for Health and Exercise Science, Department of Human Nutrition, Foods and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA
- Health Research Group, LLC, Blacksburg, VA
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Trenell MI, Ward JA, Yee BJ, Phillips CL, Kemp GJ, Grunstein RR, Thompson CH. Influence of constant positive airway pressure therapy on lipid storage, muscle metabolism and insulin action in obese patients with severe obstructive sleep apnoea syndrome. Diabetes Obes Metab 2007; 9:679-87. [PMID: 17697060 DOI: 10.1111/j.1463-1326.2006.00649.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM To observe the effect of constant positive airway pressure (CPAP) therapy on regional lipid deposition, muscle metabolism and glucose homeostasis in obese patients with obstructive sleep apnoea syndrome (OSAS). METHODS A total of 29 obese patients underwent assessment before and after a minimum of 12-week CPAP therapy. Abdominal adipose tissue was assessed using magnetic resonance imaging. Intramyocellular lipid (IMCL) and skeletal muscle creatine were assessed using (1)H-magnetic resonance spectroscopy. Fasting venous and arterial blood were collected. Glucose control was assessed using the homeostatic model. A subgroup of six patients were also evaluated for skeletal muscle pH, phosphocreatine (PCr) and mitochondrial function using (31)P-magnetic resonance spectroscopy. The sample was divided according to CPAP therapy, with regular users defined as a minimum nightly use of >or=4 h; 19 subjects were regular and 10 were irregular CPAP users. RESULTS Visceral adipose tissue volume and circulating leptin were reduced with regular CPAP use but not with irregular CPAP use. Regular CPAP use also produced an increase in skeletal muscle creatine and resting PCr and a decrease in muscle pH. Neither the regular nor irregular CPAP users showed any change in IMCL content, insulin sensitivity scores or mitochondrial function. CONCLUSIONS These data show that regular CPAP therapy reduces visceral adipose tissue and leptin and improves skeletal muscle metabolites. In obese patients with severe OSAS, regular CPAP use does not improve glucose control, suggesting that the influence of obesity on glucose control dominates over any potential effect of OSAS.
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Affiliation(s)
- M I Trenell
- Woolcock Institute of Medical Research, Royal Prince Alfred and Royal North Shore Hospitals and University of Sydney, NSW, Australia.
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Kaleth AS, Chittenden TW, Hawkins BJ, Hargens TA, Guill SG, Zedalis D, Gregg JM, Herbert WG. Unique cardiopulmonary exercise test responses in overweight middle-aged adults with obstructive sleep apnea. Sleep Med 2007; 8:160-8. [PMID: 17275399 DOI: 10.1016/j.sleep.2006.08.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2006] [Revised: 08/10/2006] [Accepted: 08/10/2006] [Indexed: 10/23/2022]
Abstract
BACKGROUND Obstructive sleep apnea (OSA) is characterized by repetitive nighttime obstructions of the upper airway that induce hypoxemia, hypercapnia, sympathetic activation, and arousals. This disorder induces cardiovascular autonomic imbalance and contributes to the development of hypertension. While the diagnostic and prognostic utility of exercise testing is well established in cardiology, the clinical utility of the exercise test in screening for OSA has not been carefully explored. To explore this potential application, we contrasted cardiopulmonary responses to exercise testing in patients recently diagnosed with OSA with apparently healthy counterparts of similar physical inactivity history, age, and body habitus. METHODS Twenty-three normotensive overweight adults with OSA [apnea-hypopnea index (AHI)=24.7+/-13.5 events h(-1); body mass index (BMI)=33.1+/-5.5 kg m(-2); age=45.6+/-10.7 years] and nine apparently healthy controls of similar age and morphology (BMI=29.5+/-5.5 kg m(-2); age=40.2+/-8.1 years; AHI=4.9+/-0.1) completed a maximal ramping cardiopulmonary exercise tolerance test on a cycle ergometer. Measures included oxygen consumption (VO(2)pk), ventilation (V(E)), heart rate (HR), blood pressure (BP), cardiac output (Qc), and stroke volume (SV). RESULTS Age, BMI, rest HR, rest BP, rest and exercise cardiac index (QI), rest and exercise stroke volume index (SVI), and V O(2)pk were not different between OSA patients and controls (p>0.05). Exercise heart rate was significantly lower and diastolic BP higher in the OSA group (p<0.05). In the physically active recovery (low-load pedaling), systolic BP recovery was delayed (p<0.05) in the OSA group while diastolic BP tended to remain higher (p=0.056). CONCLUSION Patients with OSA have a distinctive response to graded exercise, characterized by a blunted HR response, markedly delayed systolic BP response in early recovery, and elevated diastolic BP in both exercise and early recovery. Clinical trials are justified to determine the clinical utility of graded exercise testing to independently inform clinical decision-making for triaging patients to diagnostic polysomnography.
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Affiliation(s)
- Anthony S Kaleth
- Laboratory for Health and Exercise Sciences, Department of Human Nutrition, Foods and Exercise, Virgina Polytechnic Institute and State University, Blacksburg, VA 24061, USA
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Abstract
Obstructive sleep apnea is a significant medical disorder that is increasingly recognized for its wide-ranging effects on physical and mental health. It can have a profound negative impact on sleep quality, daytime alertness, mood, and cardiovascular health, and effects on metabolic and endocrinologic parameters. There is little known about the prevalence and presentation of apnea in athletes and its potential effect on athletic performance. A high index of suspicion for apnea should exist, particularly in those who have anatomic features and symptoms consistent with the disorder. This article reviews pathophysiology, diagnostic modalities, and treatment interventions.
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Affiliation(s)
- Helene A Emsellem
- The Center for Sleep & Wake Disorders, 5454 Wisconsin Avenue, Suite 1725, Chevy Chase, MD 20815, USA.
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Tryfon S, Stanopoulos I, Dascalopoulou E, Argyropoulou P, Bouros D, Mavrofridis E. Sleep Apnea Syndrome and Diastolic Blood Pressure Elevation during Exercise. Respiration 2004; 71:499-504. [PMID: 15467328 DOI: 10.1159/000080635] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2003] [Accepted: 02/25/2004] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Several studies assessing the role of obstructive sleep apnea syndrome (OSAS) as an independent risk factor for hypertension have produced conflicting results. Although the sleep apnea syndrome is associated with hypertension, there are no references regarding the blood pressure response of normotensive OSAS patients during exercise. STUDY OBJECTIVES The aim of this study was to investigate the relationship between diastolic blood pressure (DBP) response during exercise and the severity of OSAS. METHODS We performed exercise testing a day after polysomnography in 17 normotensive males who were admitted for the first time because of OSAS and in 10 normal subjects who were members of the same families. During maximal incremental exercise test (bicycle ergometry) oxygen consumption (VO(2)) and the DBP were estimated at rest and at peak exercise. VO(2) was also measured when DBP were 100 and 110 mm Hg. RESULTS At peak exercise DBP was significantly higher in OSAS patients (115.3 +/- 9.2 mm Hg) than in normal subjects (101 +/- 8.4 mm Hg, p < 0.01). OSAS patients reached a DBP of 110 mm Hg with a significantly lower VO(2) than normal subjects (1,881.5 +/- 703.4 vs. 1,972.3 +/- 108.6 ml/min, p = 0.045). VO(2) was not different between the two groups at a DBP of 100 mm Hg (1,211.2 +/- 371.7 vs. 1,536.6 +/- 267.2 ml/min, p = 0.089) but OSAS patients had a significantly lower heart rate than normals (111.2 +/- 13 vs. 118.6 +/- 27.6, p = 0.009). None of the aspects of quality of life, according to the Nottingham Health Profile Questionnaire, Part 1, were significantly different between patients and normal subjects. CONCLUSIONS Normotensive OSAS patients develop DBP elevation at an earlier stage during exercise compared to normal subjects. This hypertensive response was not correlated with the severity (apnea-hypopnea index, oxygen desaturation parameters) of OSAS. DBP elevation could be a limiting factor of physical performance in this group of patients.
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Affiliation(s)
- Stavros Tryfon
- Respiratory Failure Unit, Aristotle University, General Hospital G. Papanikolaou, Thessaloniki, Greece.
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