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Kishimoto I. Subclinical Reactive Hypoglycemia with Low Glucose Effectiveness-Why We Cannot Stop Snacking despite Gaining Weight. Metabolites 2023; 13:754. [PMID: 37367911 DOI: 10.3390/metabo13060754] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/07/2023] [Accepted: 06/13/2023] [Indexed: 06/28/2023] Open
Abstract
Obesity has grown worldwide owing to modern obesogenic lifestyles, including frequent snacking. Recently, we studied continuous glucose monitoring in obese/overweight men without diabetes and found that half of them exhibit glucose levels less than 70 mg/dL after a 75-g oral glucose load without notable hypoglycemic symptoms. Interestingly, people with "subclinical reactive hypoglycemia (SRH)" snack more frequently than those without it. Since the ingestion of sugary snacks or drinks could further induce SRH, a vicious cycle of "Snacking begets snacking via SRH" can be formed. Glucose effectiveness (Sg) is an insulin-independent mechanism that contributes to most of the whole-body glucose disposal after an oral glucose load in people without diabetes. Our recent data suggest that both higher and lower Sg are associated with SRH, while the latter but not the former is linked to snacking habits, obesity, and dysglycemia. The present review addresses the possible role of SRH in snacking habits in people with obesity/overweight, taking Sg into account. It is concluded that, for those with low Sg, SRH can be regarded as a link between snacking and obesity. Prevention of SRH by raising Sg might be key to controlling snacking habits and body weight.
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Affiliation(s)
- Ichiro Kishimoto
- Department of Endocrinology and Diabetes, Toyooka Public Hospital, 1094, Tobera, Toyooka 668-8501, Hyogo, Japan
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2
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Broadney MM, Belcher BR, Ghane N, Sheni R, Jayson MJ, Trenschel RW, Collins SM, Brychta RJ, Davis EK, Brady SM, Yang SB, Courville AB, Smith KP, Rosing DR, Chen KY, Yanovski JA. Effects of interrupting daily sedentary behavior on children's glucose metabolism: A 6-day randomized controlled trial. Pediatr Diabetes 2022; 23:1567-1578. [PMID: 36205036 PMCID: PMC9772039 DOI: 10.1111/pedi.13430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 09/14/2022] [Accepted: 10/02/2022] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Metabolic disease risk in youth is influenced by sedentary behaviors. Acute in-lab studies show that, during a single day, interrupting a sedentary period with short bouts of physical activity improves glucometabolic outcomes. OBJECTIVE To determine if acutely improved glucose metabolism persists after multi-day interruptions of sitting with walking brief bouts. We hypothesized that children who underwent interrupting sitting on multiple days would demonstrate lower insulin area under the curve during an oral glucose tolerance test compared to uninterrupted sitting. METHODS Healthy, normoglycemic children (N = 109) ages 7-11 years were randomized to one of two conditions: Control (3 h of daily Uninterrupted Sitting) or Interrupted Sitting (3-min of moderate-intensity walking every 30 min for 3 h daily); with dietary intake controlled through provision of foodstuffs for the entire experiment. Participants attended six consecutive daily visits at a research ambulatory unit. The primary outcome was insulin area under the curve during the oral glucose tolerance test on day 6 during interrupted or uninterrupted sitting; secondary outcomes included glucose and c-peptide area under the curve, energy intake at a buffet meal on day 6, and free-living activity. RESULTS Among 93 children (42 uninterrupted sitting, 51 interrupted sitting), daily interrupted sitting resulted in 21% lower insulin (β = 0.102 CI:0.032-0.172, p = 0.005) and a 10% lower C-peptide (β = 0.043, CI:0.001-0.084, p = 0.045) area under the curve. Matsuda and Glucose Effectiveness Indices were also improved (p's < 0.05). There were no group differences in energy intake or expenditure. CONCLUSIONS Sustained behavioral change by interrupting sedentary behaviors is a promising intervention strategy for improving metabolic risk in children.
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Affiliation(s)
- Miranda M. Broadney
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA,Current address: Division of Diabetes, Endocrinology, and Metabolic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Britni R. Belcher
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Bethesda, MD, USA,Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD, USA
| | - Nejla Ghane
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - Risha Sheni
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - Michael J. Jayson
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - Robert W. Trenschel
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - Shavonne M. Collins
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - Robert J. Brychta
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Elisabeth K. Davis
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - Sheila M. Brady
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
| | - Shanna B. Yang
- Nutrition Department, Hatfield Clinical Center, Bethesda, MD, USA
| | - Amber B. Courville
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA,Nutrition Department, Hatfield Clinical Center, Bethesda, MD, USA
| | - Kevin P. Smith
- Nursing Department, Hatfield Clinical Center, Bethesda, MD, USA,Cardiovascular Branch, National Heart Lung and Blood Institute, National Institutes of Health, USA
| | - Douglas R. Rosing
- Cardiovascular Branch, National Heart Lung and Blood Institute, National Institutes of Health, USA
| | - Kong Y. Chen
- Diabetes, Endocrinology, and Obesity Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Jack A. Yanovski
- Section on Growth and Obesity, Division of Intramural Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA
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Lower Glucose Effectiveness Is Associated with Postprandial Hyperglycemia in Obese/Overweight Men, Independently of Insulin Secretion. Metabolites 2022; 12:metabo12111022. [PMID: 36355105 PMCID: PMC9695914 DOI: 10.3390/metabo12111022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/18/2022] [Accepted: 10/23/2022] [Indexed: 11/16/2022] Open
Abstract
The role of glucose effectiveness on postprandial hyperglycemia in daily life is not fully studied. Here, we examined the association between SgIo, an index of glucose effectiveness calculated from a 75 g oral glucose tolerance test, and the indices of hyperglycemia in obese/overweight men. SgIo was significantly associated with 1,5-anhydroglycitol, a biochemical marker for postprandial hyperglycemia. The receiver operating characteristic analyses of SgIo and oral disposition index for detecting the subjects with 1,5-anhydroglycitol < 14 μg/mL revealed that the areas under the curves were 0.77 and 0.76, while the cutoff points (sensitivity, selectivity) were 2.53 (0.9, 0.7) and 2.06 (0.36, 0.79), respectively. Both the SgIo < 2.53 category and the disposition index < 2.06 category were significantly associated with the percentages of meals with postprandial glucose levels ≥ 200 mg/dL, and the percentages of time when continuous glucose monitoring sensor readings were ≥200 mg/dL. After adjustment with disposition index, 45.5% of the subjects with the SgIo < 2.53 category had their 1,5-anhydroglycitol < 14 μg/mL, while, in the SgIo ≥ 2.53 category, 3.6% of the subjects had the hyperglycemia (p < 0.001). In addition, there were tendencies toward higher and lower SgIo quartile categories in subjects with walking (≥8000 steps) ≥60% of days and with noodle ingestion ≥20% of meals, respectively (p for trend, 0.008 and 0.038). In conclusion, lower glucose effectiveness is associated with postprandial hyperglycemia in the daily life of obese/overweight men, independently of insulin secretion. Lifestyles such as habits of walking and noodle ingestion are significantly associated with higher and lower glucose effectiveness, respectively.
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Cho JH, Ko J, Lim ST. Relationship between metabolic syndrome and moderate-to-vigorous physical activity among adults 18 years old and over. PLoS One 2021; 16:e0258097. [PMID: 34644321 PMCID: PMC8513823 DOI: 10.1371/journal.pone.0258097] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 09/20/2021] [Indexed: 12/16/2022] Open
Abstract
The prevalence of metabolic syndrome (MetS) risk factors among the Korean population requires effective health surveillance and examination of the effects of preventative behaviors. Thus, the objective of this study is to evaluate the relationships between the clustering of MetS and MVPA in a large sample of 36,987 Koreans ranging from 20 to 80 years of age. This study recruited a total of 36,987 adults (23,813 males and 13,174 females). All participants were assessed for moderate-to-vigorous physical activity (MVPA) using the Korean version short form of the International Physical Activity Questionnaire (IPAQ). The International Diabetes Federation and the Adult Treatment Panel III criteria for blood pressure, hyperglycemia, low high-density lipoprotein cholesterol (HDL-C), and high triglycerides (TG) defined MetS. Waist circumference (WC) was determined by Asian-Pacific region populations. According to the 150-minute MVPA, there were differences in MetS risk factors in young adult males, and only three factors (WC, HDL-C, and TG) were different males in ≥ 70 years old. In females, there was a difference in MetS risk factors in the elderly, and only three factors (WC, blood pressure, and TG) were different females in ≤ 29 years old. The males who did not met the recommended MVPA had a 1.16 to 3.14 -times increase in the MetS risk factors. The females who did not met the recommended MVPA had a 1.18 to 2.57 -times increase in the MetS risk factors. Our study provides evidence that Korean adults who do not engage in recommended MVPA levels increase the odds ratio for each of the MetS risk factors when compared to those who meet the recommendations.
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Affiliation(s)
- Ji-Hoon Cho
- Department of Sport and Leisure Studies, Shingyeong University, Hwaseong, Republic of Korea
| | - Jupil Ko
- Division of Health & Kinesiology, Incheon National University, Incheon, Republic of Korea
| | - Seung-Taek Lim
- Olympic Studies Center, Kangwon National University, Chuncheon, Gangwon-do, Republic of Korea
- * E-mail:
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Nishida Y, Nishijima K, Yamada Y, Tanaka H, Matsumoto A, Fan J, Uda Y, Tomatsu H, Yamamoto H, Kami K, Kitajima S, Tanaka K. Whole-body insulin resistance and energy expenditure indices, serum lipids, and skeletal muscle metabolome in a state of lipoprotein lipase overexpression. Metabolomics 2021; 17:26. [PMID: 33594546 DOI: 10.1007/s11306-021-01777-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 02/04/2021] [Indexed: 01/06/2023]
Abstract
INTRODUCTION Overexpression of lipoprotein lipase (LPL) protects against high-fat-diet (HFD)-induced obesity and insulin resistance in transgenic rabbits; however, the molecular mechanisms remain unclear. Skeletal muscle is a major organ responsible for insulin-stimulated glucose uptake and energy expenditure. OBJECTIVES The main purpose of the current study was to examine the effects of the overexpression of LPL on the skeletal muscle metabolomic profiles to test our hypothesis that the mitochondrial oxidative metabolism would be activated in the skeletal muscle of LPL transgenic rabbits and that the higher mitochondrial oxidative metabolism activity would confer better phenotypic metabolic outcomes. METHODS Under a HFD, insulin resistance index was measured using the intravenous glucose tolerance test, and total energy expenditure (TEE) was measured by doubly-labeled water in control and LPL transgenic rabbits (n = 12, each group). Serum lipids, such as triglycerides and free fatty acid, were also measured. The skeletal muscle metabolite profile was analyzed using capillary electrophoresis time-of flight mass spectrometry in the two groups (n = 9, each group). A metabolite set enrichment analysis (MSEA) with muscle metabolites and a false discovery rate q < 0.2 was performed to identify significantly different metabolic pathways between the 2 groups. RESULTS The triglycerides and free fatty acid levels and insulin resistance index were lower, whereas the TEE was higher in the LPL transgenic rabbits than in the control rabbits. Among 165 metabolites detected, the levels of 37 muscle metabolites were significantly different between the 2 groups after false discovery rate correction (q < 0.2). The MSEA revealed that the TCA cycle and proteinogenic amino acid metabolism pathways were significantly different between the 2 groups (P < 0.05). In the MSEA, all four selected metabolites for the TCA cycle (2-oxoglutaric acid, citric acid, malic acid, fumaric acid), as well as eight selected metabolites for proteinogenic amino acid metabolism (asparagine, proline, methionine, phenylalanine, histidine, arginine, leucine, isoleucine) were consistently increased in the transgenic rabbits compared with control rabbits, suggesting that these two metabolic pathways were activated in the transgenic rabbits. Some of the selected metabolites, such as citric acid and methionine, were significantly associated with serum lipids and insulin resistance (P < 0.05). CONCLUSION The current results suggest that the overexpression of LPL may lead to increased activities of TCA cycle and proteinogenic amino acid metabolism pathways in the skeletal muscle, and these enhancements may play an important role in the biological mechanisms underlying the anti-obesity/anti-diabetes features of LPL overexpression.
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Affiliation(s)
- Yuichiro Nishida
- Department of Preventive Medicine, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga, 849-8501, Japan.
| | - Kazutoshi Nishijima
- Center for Animal Resources and Collaborative Study, National Institute for Physiological Sciences, National Institutes of Natural Sciences, Okazaki, Japan
| | - Yosuke Yamada
- National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan
| | - Hiroaki Tanaka
- Laboratory of Exercise Physiology, Faculty of Health and Sports Science, Fukuoka University, Fukuoka, Japan
| | - Akiko Matsumoto
- Department of Environmental Medicine, Faculty of Medicine, Saga University, Saga, Japan
| | - Jianglin Fan
- Department of Molecular Pathology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Yoichi Uda
- Human Metabolome Technologies, Inc, Tsuruoka, Japan
| | | | | | - Kenjiro Kami
- Human Metabolome Technologies, Inc, Tsuruoka, Japan
| | - Shuji Kitajima
- Division of Biological Resources and Development, Analytical Research Center for Experimental Sciences, Saga University, Saga, Japan
| | - Keitaro Tanaka
- Department of Preventive Medicine, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga, 849-8501, Japan
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Ahmed S, Safdar M, Morton C, Soave N, Patel R, Castillo K, Lalande S, Jimenez L, Mateika JH, Wessells R. Effect of virtual reality-simulated exercise on sympathovagal balance. PLoS One 2020; 15:e0235792. [PMID: 32673347 PMCID: PMC7365438 DOI: 10.1371/journal.pone.0235792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 06/22/2020] [Indexed: 11/30/2022] Open
Abstract
Discovery of therapeutic avenues to provide the benefits of exercise to patients with enforced sedentary behavior patterns would be of transformative importance to health care. Work in model organisms has demonstrated that benefits of exercise can be provided to stationary animals by daily intermittent stimulation of adrenergic signaling. Here, we examine as a proof of principle whether exposure of human participants to virtual reality (VR) simulation of exercise can alter sympathovagal balance in stationary humans. In this study, 24 participants performed 15 minutes of cycling exercise at standardized resistance, then repeated the exercise with a virtual reality helmet that provided an immersive environment. On a separate day, they each controlled a virtual environment for 15 minutes to simulate exercise without actual cycling exercise. Response to each treatment was assessed by measuring heart rate (HR), norepinephrine, and heart rate variability, and each participant's response to virtual exercise was compared internally to his/her response to the actual cycling. We found that neither post-exercise norepinephrine nor post-exercise HR was significantly increased by VR simulation. However, heart rate variability measured during virtual exercise was comparable to actual cycling in participants that engaged in moderate exercise, but not in those that engaged in high-intensity exercise. These findings suggest that virtual exercise has the potential to mimic some effects of moderate exercise. Further work will be needed to examine the longitudinal effects of chronic exposure to VR-simulated exercise.
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Affiliation(s)
- Sheaza Ahmed
- Department of Physiology, Wayne State University, Detroit, Michigan, United States of America
| | - Maryam Safdar
- Department of Physiology, Wayne State University, Detroit, Michigan, United States of America
| | - Courtney Morton
- Department of Kinesiology, Health and Sport Studies, Wayne State University, Detroit, Michigan, United States of America
| | - Nicolette Soave
- Department of Kinesiology, Health and Sport Studies, Wayne State University, Detroit, Michigan, United States of America
| | - Riya Patel
- Department of Kinesiology, Health and Sport Studies, Wayne State University, Detroit, Michigan, United States of America
| | - Kenia Castillo
- Department of Physiology, Wayne State University, Detroit, Michigan, United States of America
| | - Sophie Lalande
- Department of Kinesiology and Health Education, The University of Texas at Austin, Austin, Texas, United States of America
| | - Linda Jimenez
- Department of Kinesiology, Health and Sport Studies, Wayne State University, Detroit, Michigan, United States of America
| | - Jason H. Mateika
- Department of Physiology, Wayne State University, Detroit, Michigan, United States of America
- Department of Internal Medicine, Wayne State University, Detroit, Michigan, United States of America
| | - Robert Wessells
- Department of Physiology, Wayne State University, Detroit, Michigan, United States of America
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Ding C, Chooi YUC, Chan Z, Lo J, Choo J, Ding BTK, Leow MKS, Magkos F. Dose-Dependent Effects of Exercise and Diet on Insulin Sensitivity and Secretion. Med Sci Sports Exerc 2020; 51:2109-2116. [PMID: 31033904 DOI: 10.1249/mss.0000000000002020] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
PURPOSE A single bout of aerobic exercise increases insulin sensitivity the next day. The effects of exercise on insulin secretion, the role of exercise-induced energy deficit, and possible dose-response relationships are not well understood. This study aimed to evaluate insulin sensitivity and insulin secretion after progressively greater negative energy balance induced by exercise or diet. METHODS Acute energy deficits (20% or 40% of weight maintenance needs) were induced by a single day of aerobic exercise (cycling at moderate intensity, n = 13) or dietary restriction (n = 19) in healthy men and women (age, 26 ± 2 yr; body mass index, 21.8 ± 0.5 kg·m). Intravenous glucose tolerance tests in conjunction with minimal modeling were performed the next morning, and blood samples were collected for 3 h to measure glucose and insulin concentrations. RESULTS Insulin sensitivity increased linearly after exercise-induced energy deficits (P = 0.007) but did not change after equivalent diet-induced energy deficits (P = 0.673). Acute insulin response decreased after both exercise (P < 0.001) and dietary restriction (P = 0.005). The disposition index and glucose effectiveness were not affected by exercise (P = 0.138 and 0.808, respectively), but both decreased after 40% dietary restriction (P = 0.048 and 0.002, respectively). CONCLUSIONS These results indicate that insulin sensitivity and insulin secretion are related to exercise energy expenditure, albeit in a different fashion (insulin sensitivity increases linearly, whereas insulin secretion drops to a nadir with a low exercise dose and does not decrease further). These changes cannot be replicated by equivalent energy deficits induced by dietary restriction, suggesting that exercise and diet have different effects on the mechanisms regulating glucose homeostasis. TRIAL REGISTRATION ClinicalTrials.gov, NCT03264001.
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Affiliation(s)
- Cherlyn Ding
- Clinical Nutrition Research Centre, Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE
| | - Y U Chung Chooi
- Clinical Nutrition Research Centre, Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE
| | - Zhiling Chan
- Clinical Nutrition Research Centre, Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE
| | - Jezebel Lo
- Clinical Nutrition Research Centre, Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE
| | - John Choo
- Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE
| | - Benjamin Tze Keong Ding
- Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE
| | - Melvin K-S Leow
- Clinical Nutrition Research Centre, Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE.,Department of Endocrinology, Tan Tock Seng Hospital, SINGAPORE.,Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School, SINGAPORE.,Lee Kong Chian School of Medicine, Nanyang Technological University, SINGAPORE
| | - Faidon Magkos
- Clinical Nutrition Research Centre, Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and National University Health System, SINGAPORE.,Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore (NUS), SINGAPORE.,Section for Obesity Research, Department of Nutrition, Exercise and Sports, University of Copenhagen, Frederiksberg, DENMARK
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Melouane A, Yoshioka M, St-Amand J. Extracellular matrix/mitochondria pathway: A novel potential target for sarcopenia. Mitochondrion 2020; 50:63-70. [DOI: 10.1016/j.mito.2019.10.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Revised: 09/28/2019] [Accepted: 10/10/2019] [Indexed: 12/30/2022]
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Nakagata T, Fukao K, Kobayashi H, Katamoto S, Naito H. The Effects of Transdermal Nicotine Patches on the Cardiorespiratory and Lactate Responses During Exercise from Light to Moderate Intensity: Implications for Exercise Prescription during Smoking Cessation. ACTA ACUST UNITED AC 2019; 55:medicina55070348. [PMID: 31284668 PMCID: PMC6680975 DOI: 10.3390/medicina55070348] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 07/04/2019] [Accepted: 07/04/2019] [Indexed: 12/23/2022]
Abstract
Background and objectives: Exercise can help ease withdrawal symptoms of smokers. However, there is little information about the physiological responses, such as cardiorespiratory and lactate (La) responses, during exercise from light to moderate intensity combined with transdermal nicotine patches (TNPs) in smokers. This study aimed to investigate the effect of TNPs on the cardiorespiratory and La responses during exercise at light to moderate intensity. Materials and Methods: Fourteen young men (8 non-smokers, 6 current smokers) aged 20 to 26 years participated in this study. They performed an incremental graded submaximal exercise test using an electromagnetic cycle ergometer set from 30 to 210 W with (TNP condition) or without a TNP (control condition) in a random order. The TNP was applied to the left arm 8–10 h prior to starting the exercise to achieve the peak level of blood nicotine concentration. Heart rate (HR), rate of perceived exertion (RPE), oxygen consumption (VO2), ventilation (VE), and blood La at rest and during exercise were measured and analyzed. Results: The HR at rest was significantly higher in the TNP condition than in the control condition (TNP; 74.7 ± 13.8 bpm, control; 65.3 ± 10.8 bpm, p < 0.001). There was no interaction (condition × exercise intensity) between any of the variables, and VO2, VE, RPE, and La during exercise were not significantly different between the conditions. However, HR during exercise was 6.7 bpm higher on average in the TNP condition. Conclusions: The HR during exercise was greater at light to moderate intensity with a TNP. Our study results will guide clinicians or health professionals when prescribing exercise programs combined with TNPs for healthy young smokers.
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Affiliation(s)
- Takashi Nakagata
- Graduate School of Health and Sports Science, Juntendo University, Hiraka-gakuendai 1-1, Inzai, Chiba 270-1695, Japan.
- National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8636, Japan.
| | - Kosuke Fukao
- Graduate School of Health and Sports Science, Juntendo University, Hiraka-gakuendai 1-1, Inzai, Chiba 270-1695, Japan
| | - Hiroyuki Kobayashi
- Graduate School of Health and Sports Science, Juntendo University, Hiraka-gakuendai 1-1, Inzai, Chiba 270-1695, Japan
- Mito Medical Center, Tsukuba University Hospital, 1-1-1 Tennodai, Tsukuba, Ibaraki 310-0015, Japan
| | - Shizuo Katamoto
- Graduate School of Health and Sports Science, Juntendo University, Hiraka-gakuendai 1-1, Inzai, Chiba 270-1695, Japan
| | - Hisashi Naito
- Graduate School of Health and Sports Science, Juntendo University, Hiraka-gakuendai 1-1, Inzai, Chiba 270-1695, Japan
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Effect of the Health Tourism weight loss programme on body composition and health outcomes in healthy and excess-weight adults. Br J Nutr 2019; 119:1133-1141. [PMID: 29759101 DOI: 10.1017/s0007114518000582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Excess weight loss while minimising fat-free mass (FFM) loss is important for health. Travel is a particular period at risk for weight gain and for which the effects of a short-term intensive weight loss programme have not been studied. Therefore, we studied the effect of a novel, 1-week supervised health travel programme combining high volume, low-to-moderate intensity exercise and energy intake restriction on weight, body composition and health outcomes in adults. Weight was also monitored for 12 weeks after the programme. In all, thirty-six subjects (nineteen men, seventeen women) consisting of sixteen excess-weight (BMI: 27·1 (sd 1·7) kg/m2) and twenty healthy-weight (BMI: 22·3 (sd 1·8) kg/m2) individuals participated. Subjects performed 1 h of slow-paced intermittent jogging three times per d and other leisure activities, whereas consuming only provided foods without water restriction. Body mass significantly decreased from pre- to post-intervention in excess-weight and healthy-weight individuals (-3·5 (sd 1·5) and -3·5 (sd 1·3) %, respectively; P<0·001 for both), and losses were maintained at 12 weeks post-intervention in both groups (-6·3 (sd 3·8) and -1·7 (sd 4·0) %, respectively; P<0·01 for both). Fat mass also significantly decreased in both groups (excess weight: -9·2 (sd 4·6) %: healthy weight: -13·4 (sd 9·0) %; P<0·01 for both), whereas FFM was maintained. Similar improvements were observed for blood biochemistry and pressure in both groups. This short-term weight loss intervention yielded favourable outcomes in both excess- and healthy-weight adults, particularly a 3·5 % weight loss with no significant change to FFM. In addition, participants maintained weight loss for at least 12 weeks. Of multiple programme choices, the Health Tourism weight loss programme's results indicate that it is a viable option.
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Hari A, Fealy C, Solomon TPJ, Haus JM, Kelly KR, Barkoukis H, Kirwan JP. Exercise-induced improvements in glucose effectiveness are blunted by a high glycemic diet in adults with prediabetes. Acta Diabetol 2019; 56:211-217. [PMID: 30612202 PMCID: PMC6530476 DOI: 10.1007/s00592-018-1272-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Accepted: 12/10/2018] [Indexed: 11/25/2022]
Abstract
AIMS Glucose effectiveness (GE) refers to the ability of glucose to influence its own metabolism through insulin-independent mechanisms. Diminished GE is a predictor of progression to type 2 diabetes. Exercise training improves GE, however, little is known about how dietary interventions, such as manipulating the glycemic index of diets, interact with exercise-induced improvements in GE in at-risk populations. METHODS We enrolled 33 adults with obesity and pre-diabetes (17 males, 65.7 ± 4.3 years, 34.9 ± 4.2 kg m-2) into a 12-week exercise training program (1 h day-1 and 5 day week-1 at ~ 85% of maximum heart rate) while being randomized to concurrently receive either a low (EX-LOG: 40 ± 0.3 au) or high (EX-HIG: 80 ± 0.6 au) glycemic index diet. A 75-g oral-glucose-tolerance test (OGTT) was performed before and after the intervention and GE was calculated using the Nagasaka equation. Insulin resistance was estimated using a hyperinsulinemic-euglycemic clamp and cardiorespiratory fitness using a VO2max test. RESULTS Both EX-LOG and EX-HIG groups had similar improvements in weight (8.6 ± 5.1 kg, P < 0.001), VO2max (6 ± 3.5 mL kg-1 min-1, P < 0.001) and clamp-measured peripheral insulin resistance (1.7 ± 0.9 mg kg-1 min-1, P < 0.001), relative to baseline data. GE in EX-LOG and EX-HIG was similar at baseline (1.9 ± 0.38 vs. 1.85 ± 0.3 mg dL-1 min-1, respectively; P > 0.05) and increased by ~ 20% post-intervention in the EX-LOG arm (∆GE: 0.07-0.57 mg dL-1 min-1, P < 0.05). Plasma free fatty acid (FFA) concentrations also decreased only in the EX-LOG arm (∆FFA: 0.13 ± 0.23 mmol L-1, P < 0.05). CONCLUSIONS Our data suggest that a high glycemic index diet may suppress exercise-induced enhancement of GE, and this may be mediated through plasma FFAs.
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Affiliation(s)
- Adithya Hari
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
- Case Western Reserve University, Cleveland, OH, USA
| | - Ciaràn Fealy
- Maastricht University, Maastricht, The Netherlands
| | | | | | - Karen R Kelly
- Warfighter Performance Department, Naval Health Research Center, 140 Sylvester Road, San Diego, CA, USA
| | | | - John P Kirwan
- Department of Pathobiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA.
- Case Western Reserve University, Cleveland, OH, USA.
- Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA, 70808, USA.
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12
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Chastin SFM, De Craemer M, De Cocker K, Powell L, Van Cauwenberg J, Dall P, Hamer M, Stamatakis E. How does light-intensity physical activity associate with adult cardiometabolic health and mortality? Systematic review with meta-analysis of experimental and observational studies. Br J Sports Med 2018; 53:370-376. [PMID: 29695511 PMCID: PMC6579499 DOI: 10.1136/bjsports-2017-097563] [Citation(s) in RCA: 229] [Impact Index Per Article: 38.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/26/2018] [Indexed: 12/27/2022]
Abstract
Aim To assess the relationship between time spent in light physical activity and cardiometabolic health and mortality in adults. Design Systematic review and meta-analysis. Data sources Searches in Medline, Embase, PsycInfo, CINAHL and three rounds of hand searches. Eligibility criteria for selecting studies Experimental (including acute mechanistic studies and physical activity intervention programme) and observational studies (excluding case and case–control studies) conducted in adults (aged ≥18 years) published in English before February 2018 and reporting on the relationship between light physical activity (<3 metabolic equivalents) and cardiometabolic health outcomes or all-cause mortality. Study appraisal and synthesis Study quality appraisal with QUALSYST tool and random effects inverse variance meta-analysis. Results Seventy-two studies were eligible including 27 experimental studies (and 45 observational studies). Mechanistic experimental studies showed that short but frequent bouts of light-intensity activity throughout the day reduced postprandial glucose (−17.5%; 95% CI −26.2 to −8.7) and insulin (−25.1%; 95% CI −31.8 to –18.3) levels compared with continuous sitting, but there was very limited evidence for it affecting other cardiometabolic markers. Three light physical activity programme intervention studies (n ranging from 12 to 58) reduced adiposity, improved blood pressure and lipidaemia; the programmes consisted of activity of >150 min/week for at least 12 weeks. Six out of eight prospective observational studies that were entered in the meta-analysis reported that more time spent in daily light activity reduced risk of all-cause mortality (pooled HR 0.71; 95% CI 0.62 to 0.83). Conclusions Light-intensity physical activity could play a role in improving adult cardiometabolic health and reducing mortality risk. Frequent short bouts of light activity improve glycaemic control. Nevertheless, the modest volume of the prospective epidemiological evidence base and the moderate consistency between observational and laboratory evidence inhibits definitive conclusions.
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Affiliation(s)
- Sebastien F M Chastin
- School of Health and Life Science, Institute for Applied Health Research, Glasgow Caledonian University, Glasgow, UK.,Department of Movement and Sport Sciences, Ghent University, Ghent, Belgium
| | - Marieke De Craemer
- Department of Movement and Sport Sciences, Ghent University, Ghent, Belgium
| | - Katrien De Cocker
- Department of Movement and Sport Sciences, Ghent University, Ghent, Belgium.,Research Foundation Flanders, Brussels, Belgium.,Institute for Resilient Regions, University of Southern Queensland, Toowoomba, Queensland, Australia
| | - Lauren Powell
- Epidemiology Unit, Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia.,Prevention Research Collaboration, School of Public Health, University of Sydney, Sydney, New South Wales, Australia
| | - Jelle Van Cauwenberg
- Research Foundation Flanders, Brussels, Belgium.,Department of Public Health, Ghent University, Ghent, Belgium
| | - Philippa Dall
- School of Health and Life Science, Institute for Applied Health Research, Glasgow Caledonian University, Glasgow, UK
| | - Mark Hamer
- School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK
| | - Emmanuel Stamatakis
- Epidemiology Unit, Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia.,Prevention Research Collaboration, School of Public Health, University of Sydney, Sydney, New South Wales, Australia
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13
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Peter A, Kovarova M, Staiger H, Machann J, Schick F, Königsrainer A, Königsrainer I, Schleicher E, Fritsche A, Häring HU, Stefan N. The hepatokines fetuin-A and fetuin-B are upregulated in the state of hepatic steatosis and may differently impact on glucose homeostasis in humans. Am J Physiol Endocrinol Metab 2018; 314:E266-E273. [PMID: 29138227 DOI: 10.1152/ajpendo.00262.2017] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The liver is a central regulator of whole body glucose, and lipid homeostasis and hepatokines, like fetuin-A, have been identified as markers and mediators of fatty liver-induced cardiometabolic risk. The closely related protein fetuin-B was shown to be upregulated in the fatty liver and to impact on glucose homeostasis in mice. In the present study we aimed to test the relevance of these findings in humans. In 55 subjects, hepatic mRNA expression of both hepatokines, fetuin-A and fetuin-B, associated positively with liver triglyceride content, whereas only fetuin-A expression associated with the homeostatic model assessment of insulin resistance. In 220 subjects who underwent precise metabolic phenotyping, circulating fetuin-A, but not fetuin-B, associated positively with liver fat content, and negatively with insulin sensitivity, measured during the oral glucose tolerance test (OGTT) and during the euglycemic, hyperinsulinemic clamp. Both circulating fetuin-A and fetuin-B correlated positively with the glucose area under the curve during the OGTT, but after additional adjustment for insulin sensitivity this relationship remained significant only for fetuin-B. In conclusion, despite the fact that the two hepatokines, fetuin-A and fetuin-B, are upregulated in the state of hepatic steatosis in humans, it appears that they differently impact on glucose homeostasis. Our data are in agreement with observations that fetuin-A can alter insulin signaling and that fetuin-B may regulate glucose homeostasis via so far unknown effects, possibly on glucose effectiveness.
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Affiliation(s)
- Andreas Peter
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University of Tübingen , Tübingen , Germany
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
| | - Marketa Kovarova
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University of Tübingen , Tübingen , Germany
| | - Harald Staiger
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
- Institute for Pharmaceutical Sciences, Department of Pharmacy and Biochemistry, University of Tübingen , Tübingen , Germany
| | - Jürgen Machann
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
| | - Fritz Schick
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
- Section on Experimental Radiology, University of Tübingen , Tübingen , Germany
| | - Alfred Königsrainer
- Department of General, Visceral and Transplant Surgery, University of Tübingen , Tübingen , Germany
| | - Ingmar Königsrainer
- Department of General, Visceral and Transplant Surgery, University of Tübingen , Tübingen , Germany
| | - Erwin Schleicher
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University of Tübingen , Tübingen , Germany
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
| | - Andreas Fritsche
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University of Tübingen , Tübingen , Germany
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
| | - Hans-Ulrich Häring
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University of Tübingen , Tübingen , Germany
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
| | - Norbert Stefan
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Vascular Medicine, Nephrology and Clinical Chemistry, University of Tübingen , Tübingen , Germany
- Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich at the University of Tübingen , Tübingen , Germany
- German Center for Diabetes Research (DZD), München- Neuherberg , Germany
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14
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Edwards J, Hosseinzadeh H. The impact of structured physical activity on glycaemic control in diabetes prevention programmes: A systematic review. PROCEEDINGS OF SINGAPORE HEALTHCARE 2017. [DOI: 10.1177/2010105817739924] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Background: Seven landmark randomised controlled trials, with some that began as early as the 1990s, observed the prediabetic state, namely, impaired glucose tolerance and impaired fasting glucose conditions, against the impact of lifestyle interventions such as physical activity, to prevent or delay the onset of type 2 diabetes mellitus. In addition to the landmark trials, this systematic review examines 14 studies that retained a focus on prediabetic individuals and measured the efficacy of physical activity on improving glucose tolerance. Results: Type, duration and intensity of structured physical activity can have unique benefits to prediabetic individuals. It is posited that diabetes prevention programmes must target prediabetic individuals as belonging to a high-risk group, separate and distinct from those identified with overall risk factors. While the transition from prediabetes to type 2 diabetes mellitus is not completely deterministic, the conversion rate is phenomenally higher among those with impaired glucose tolerance than those with normal glucose levels. Conclusion: Tenets of health behaviour models do support inferences that prediabetic individuals are potentially more inclined to weighing the risks and benefits of progressive illnesses and would therefore be more receptive to active participation in interventions. More research is required to develop evidence-based diabetes prevention programmes linked to structured physical activity intervention.
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Affiliation(s)
- Joseph Edwards
- School of Health & Society, University of Wollongong, NSW, Australia
| | - Hassan Hosseinzadeh
- School of Public Health and Community Medicine, University of New South Wales, Sydney, NSW, Australia
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15
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Hatamoto Y, Goya R, Yamada Y, Yoshimura E, Nishimura S, Higaki Y, Tanaka H. Effect of exercise timing on elevated postprandial glucose levels. J Appl Physiol (1985) 2017; 123:278-284. [DOI: 10.1152/japplphysiol.00608.2016] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 04/10/2017] [Accepted: 04/11/2017] [Indexed: 12/20/2022] Open
Abstract
There is no consensus regarding optimal exercise timing for reducing postprandial glucose (PPG). The purpose of the present study was to determine the most effective exercise timing. Eleven participants completed four different exercise patterns 1) no exercise; 2) preprandial exercise (jogging); 3) postprandial exercise; and 4) brief periodic exercise intervention (three sets of 1-min jogging + 30 s of rest, every 30 min, 20 times total) in a random order separated by a minimum of 5 days. Preprandial and postprandial exercise consisted of 20 sets of intermittent exercise (1 min of jogging + 30 s rest per set) repeated 3 times per day. Total daily exercise volume was identical for all three exercise patterns. Exercise intensities were 62.4 ± 12.9% V̇o2peak. Blood glucose concentrations were measured continuously throughout each trial for 24 h. After breakfast, peak blood glucose concentrations were lower with brief periodic exercise (99 ± 6 mg/dl) than those with preprandial and postprandial exercise (109 ± 10 and 115 ± 14 mg/dl, respectively, P < 0.05, effect size = 0.517). After lunch, peak glucose concentrations were lower with brief periodic exercise than those with postprandial exercise (97 ± 5 and 108 ± 8 mg/dl, P < 0.05, effect size = 0.484). After dinner, peak glucose concentrations did not significantly differ among exercise patterns. Areas under the curve over 24 h and 2 h postprandially did not differ among exercise patterns. These findings suggest that brief periodic exercise may be more effective than preprandial and postprandial exercise at attenuating PPG in young active individuals. NEW & NOTEWORTHY This was the first study to investigate the effect of different exercise timing (brief periodic vs. preprandial vs. postprandial exercise) on postprandial glucose (PPG) attenuation in active healthy men. We demonstrated that brief periodic exercise attenuated peak PPG levels more than preprandial and postprandial exercise, particularly in the morning. Additionally, PPG rebounded soon after discontinuing postprandial exercise. Thus, brief periodic exercise may be better than preprandial and postprandial exercise at attenuating PPG levels.
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Affiliation(s)
- Yoichi Hatamoto
- The Fukuoka University Institute for Physical Activity, Fukuoka, Japan
| | - Ryoma Goya
- Graduate School of Sports and Health Science, Fukuoka University, Fukuoka, Japan
| | - Yosuke Yamada
- The Fukuoka University Institute for Physical Activity, Fukuoka, Japan
- Department of Nutritional Science, National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan; and
| | - Eichi Yoshimura
- Department of Food and Health Sciences, Prefectural University of Kumamoto Faculty of Environmental and Symbiotic Sciences, Kumamoto, Japan
| | - Sena Nishimura
- Graduate School of Sports and Health Science, Fukuoka University, Fukuoka, Japan
| | - Yasuki Higaki
- The Fukuoka University Institute for Physical Activity, Fukuoka, Japan
- Graduate School of Sports and Health Science, Fukuoka University, Fukuoka, Japan
| | - Hiroaki Tanaka
- The Fukuoka University Institute for Physical Activity, Fukuoka, Japan
- Graduate School of Sports and Health Science, Fukuoka University, Fukuoka, Japan
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16
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Effects of a 12-week, short-interval, intermittent, low-intensity, slow-jogging program on skeletal muscle, fat infiltration, and fitness in older adults: randomized controlled trial. Eur J Appl Physiol 2016; 117:7-15. [DOI: 10.1007/s00421-016-3493-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 10/20/2016] [Indexed: 12/20/2022]
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17
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Abstract
Insulin resistance is a component of several health disorders, most notably impaired glucose tolerance and type 2 diabetes mellitus. Insulin-resistant individuals have an impaired biological response to the usual action of insulin; that is, they have reduced insulin sensitivity. Various methods are used to assess insulin sensitivity both in individuals and in study populations. Validity, reproducibility, cost, and degree of subject burden are important factors for both clinicians and researchers to consider when weighing the merits of a particular method. This article describes several in vivo methods used to assess insulin sensitivity and presents the advantages and disadvantages of each.
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Affiliation(s)
- Kimberly K Trout
- Villanova University College of Nursing, Villanova, Pennsylvania 19085, USA.
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18
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Meex RC, Hoy AJ, Morris A, Brown RD, Lo JCY, Burke M, Goode RJA, Kingwell BA, Kraakman MJ, Febbraio MA, Greve JW, Rensen SS, Molloy MP, Lancaster GI, Bruce CR, Watt MJ. Fetuin B Is a Secreted Hepatocyte Factor Linking Steatosis to Impaired Glucose Metabolism. Cell Metab 2015; 22:1078-89. [PMID: 26603189 DOI: 10.1016/j.cmet.2015.09.023] [Citation(s) in RCA: 162] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 08/04/2015] [Accepted: 09/23/2015] [Indexed: 12/18/2022]
Abstract
Liver steatosis is associated with the development of insulin resistance and the pathogenesis of type 2 diabetes. We tested the hypothesis that protein signals originating from steatotic hepatocytes communicate with other cells to modulate metabolic phenotypes. We show that the secreted factors from steatotic hepatocytes induce pro-inflammatory signaling and insulin resistance in cultured cells. Next, we identified 168 hepatokines, of which 32 were differentially secreted in steatotic versus non-steatotic hepatocytes. Targeted analysis showed that fetuin B was increased in humans with liver steatosis and patients with type 2 diabetes. Fetuin B impaired insulin action in myotubes and hepatocytes and caused glucose intolerance in mice. Silencing of fetuin B in obese mice improved glucose tolerance. We conclude that the protein secretory profile of hepatocytes is altered with steatosis and is linked to inflammation and insulin resistance. Therefore, preventing steatosis may limit the development of dysregulated glucose metabolism in settings of overnutrition.
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Affiliation(s)
- Ruth C Meex
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Andrew J Hoy
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Alexander Morris
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Russell D Brown
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Jennifer C Y Lo
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Melissa Burke
- Biotechnology Research Laboratories, Department of Physiology, Monash University, Clayton, VIC 3800, Australia; Mill Hill Laboratory, The Francis Crick Institute, London NW7 1AA, UK
| | - Robert J A Goode
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
| | | | | | - Mark A Febbraio
- Baker IDI Heart and Diabetes Institute, Melbourne, VIC 3004, Australia; The Garvan Institute of Medical Research, Sydney, NSW 2010, Australia
| | - Jan Willem Greve
- NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Department of General Surgery, Maastricht, the Netherlands
| | - Sander S Rensen
- NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Department of General Surgery, Maastricht, the Netherlands
| | - Mark P Molloy
- Australian Proteome Analysis Facility, Macquarie University, Sydney, NSW 2109, Australia
| | | | - Clinton R Bruce
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Matthew J Watt
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Biology of Lipid Metabolism Laboratory, Department of Physiology, Monash University, Clayton, VIC 3800, Australia.
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19
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Dube S, Errazuriz-Cruzat I, Basu A, Basu R. The forgotten role of glucose effectiveness in the regulation of glucose tolerance. Curr Diab Rep 2015; 15:605. [PMID: 25869240 DOI: 10.1007/s11892-015-0605-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Glucose effectiveness (SG) is the ability of glucose per se to stimulate its own uptake and to suppress its own production under basal/constant insulin concentrations. In an individual, glucose tolerance is a function of insulin secretion, insulin action and SG. Under conditions of declining insulin secretion and action (e.g. type 2 diabetes), the degree of SG assumes increasing significance in determining the level of glucose tolerance both in fasted and postprandial states. Although the importance of SG has been recognized for years, mechanisms that contribute to SG are poorly understood. Research data on modulation of SG and its impact in glucose intolerance is limited. In this review, we will focus on the role of SG in the regulation of glucose tolerance, its evaluation, and potential advantages of therapies that can enhance glucose-induced stimulation of glucose uptake and suppression of its own production in conditions of impaired insulin secretion and action.
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Affiliation(s)
- Simmi Dube
- Gandhi Medical College, Bhopal, MP, India
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20
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Effects of 2 weeks of low-intensity cycle training with different pedaling rates on the work rate at lactate threshold. Eur J Appl Physiol 2014; 115:1005-13. [PMID: 25542416 DOI: 10.1007/s00421-014-3081-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Accepted: 12/11/2014] [Indexed: 10/24/2022]
Abstract
PURPOSE This study examined (1) the effects of a single bout of exercise at different pedaling rates on physiological responses, pedal force, and muscle oxygenation, and (2) the effects of 2 weeks of training with different pedaling rates on work rate at lactate threshold (WorkLT). METHODS Sixteen healthy men participated in the study. An incremental exercise test involving pedaling a cycling ergometer at 50 rpm was conducted to assess maximal oxygen consumption and WorkLT. The participants performed constant workload, submaximal exercise tests at WorkLT intensity with three different pedaling rates (35, 50, and 75 rpm). Oxygen consumption ([Formula: see text]O2), blood pressure, heart rate (HR), blood lactate, and pedal force were measured and oxy-hemoglobin/myoglobin concentration (OxyHb/Mb) at vastus lateralis was monitored by near-infrared spectroscopy during exercise. The participants were then randomly assigned to cycling exercise training at WorkLT in either the low or high frequency pedaling rate (LFTr, 35 rpm or HFTr, 75 rpm) group. Each 60-min training session was performed five times/week. RESULTS Despite maintaining the same work rate, [Formula: see text]O2 and HR were significantly lower at 35 than 75 rpm. Conversely, integrated pedal force was significantly higher at 35 than 75 rpm. Peripheral OxyHb/Mb was significantly lower at 35 than 75 rpm. After 2 weeks of training, WorkLT normalized to body mass significantly increased in the LFTr, but not the HFTr group. CONCLUSIONS Pedaling rate and the corresponding pedal force and peripheral oxygenation during cycling exercise influence the effect of training at LT on WorkLT.
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21
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Effects of an outdoor bicycle-based intervention in healthy rural Indian men with normal and low birth weight. J Dev Orig Health Dis 2014; 6:27-37. [PMID: 25514893 DOI: 10.1017/s2040174414000609] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Physical inactivity and low birth weight (LBW) may lead to an increased risk for developing type 2 diabetes. The extent to which LBW individuals may benefit from physical exercise training when compared with those with normal birth weight (NBW) controls is uncertain. We assessed the impact of an outdoor exercise intervention on body composition, insulin secretion and action in young men born with LBW and NBW in rural India. A total of 61 LBW and 56 NBW healthy young men were recruited into the study. The individuals were instructed to perform outdoor bicycle exercise training for 45 min every day. Fasting blood samples, intravenous glucose tolerance tests and bioimpedance body composition assessment were carried out. Physical activity was measured using combined accelerometry and heart rate monitoring during the first and the last week of the intervention. Following the exercise intervention, the LBW group displayed an increase in physical fitness [55.0 ml (O2)/kg min (52.0-58.0)-57.5 ml (O2)/kg min (54.4-60.5)] level and total fat-free mass [10.9% (8.0-13.4)-11.4% (8.0-14.6)], as well as a corresponding decline in the ratio of total fat mass/fat-free mass. In contrast, an increase in total fat percentage as well as total fat mass was observed in the NBW group. After intervention, fasting plasma insulin levels, homoeostasis model assessments (HOMA) of insulin resistance (HOMA-IR) and insulin secretion (HOMA-IS), improved to the same extent in both the groups. In summary, young men born with LBW in rural India benefit metabolically from exercise training to an extent comparable with NBW controls.
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22
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Lee DH, Kim YM, Jekal Y, Park S, Kim KC, Naruse M, Kim SH, Kim SH, Park JH, Lee MK, Chu SH, Jeon JY. Low levels of physical activity are associated with increased metabolic syndrome risk factors in korean adults. Diabetes Metab J 2013; 37:132-9. [PMID: 23641354 PMCID: PMC3638224 DOI: 10.4093/dmj.2013.37.2.132] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Accepted: 11/20/2012] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND Low levels of physical activity (PA) are strongly associated with the development of metabolic syndrome (MetS) and chronic diseases. However, few studies have examined this association in Koreans. The primary purpose of this study was to examine the associations between PA and MetS risks in Korean adults. METHODS A total of 1,016 Korean adults (494 males and 522 females) participated in this study. PA levels were assessed using the International PA Questionnaire. MetS risk factors were determined using clinically established diagnostic criteria. RESULTS Compared with the highest PA group, the group with the lowest level of PA was at greater risk of high triglyceride (TG) in males (odds ratio [OR], 1.87; 95% confidence interval [CI], 1.07 to 3.24) and of hemoglobin A1c ≥5.5% in females (OR, 1.75; 95% CI, 1.00 to 3.04) after adjusting for age and body mass index. Compared with subjects who met the PA guidelines, those who did not meet the guidelines were more likely to have low high density lipoprotein cholesterol in both males (OR, 1.69; 95% CI, 1.11 to 2.58), and females (OR, 1.82; 95% CI, 1.20 to 2.77). Furthermore, those who did not meet the PA guidelines were at increased risk of high TG levels in males (OR, 1.69; 95% CI, 1.23 to 2.86) and abnormal fasting glucose (OR, 1.93; 95% CI, 1.17 to 3.20) and MetS (OR, 2.10; 95% CI, 1.15 to 3.84) in females. CONCLUSION Increased levels of PA are significantly associated with a decreased risk of abnormal MetS components.
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Affiliation(s)
- Dong Hoon Lee
- Department of Sport and Leisure Studies, Yonsei University College of Sciences in Education, Seoul, Korea
| | - Yoon Myung Kim
- University College, Yonsei International Campus, Incheon, Korea
| | - Yoonsuk Jekal
- Department of Exercise and Sports Science, Jeju National University College of Natural Sciences, Jeju, Korea
| | - Sukyung Park
- Department of Sport and Leisure Studies, Yonsei University College of Sciences in Education, Seoul, Korea
| | - Kyong-Chol Kim
- Department of Family Medicine, Gangseo MizMedi Hospital, Seoul, Korea
| | - Masayo Naruse
- Department of Sport and Leisure Studies, Yonsei University College of Sciences in Education, Seoul, Korea
| | - Sun Hyun Kim
- Department of Family Medicine, Myongji Hospital, Kwandong University College of Medicine, Goyang, Korea
| | - Sang-Hwan Kim
- Department of Family Medicine, Myongji Hospital, Kwandong University College of Medicine, Goyang, Korea
| | - Ji-Hye Park
- Department of Sport and Leisure Studies, Yonsei University College of Sciences in Education, Seoul, Korea
| | - Mi Kyung Lee
- Department of Sport and Leisure Studies, Yonsei University College of Sciences in Education, Seoul, Korea
| | - Sang Hui Chu
- Department of Clinical Nursing Science, Yonsei University College of Nursing, Seoul, Korea
| | - Justin Y. Jeon
- Department of Sport and Leisure Studies, Yonsei University College of Sciences in Education, Seoul, Korea
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Jung JY, Han KA, Ahn HJ, Kwon HR, Lee JH, Park KS, Min KW. Effects of aerobic exercise intensity on abdominal and thigh adipose tissue and skeletal muscle attenuation in overweight women with type 2 diabetes mellitus. Diabetes Metab J 2012; 36:211-21. [PMID: 22737661 PMCID: PMC3380125 DOI: 10.4093/dmj.2012.36.3.211] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Accepted: 03/13/2012] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND We investigated the effects of exercise intensity on abdominal and mid-thigh adipose tissue, attenuation of skeletal muscle, and insulin sensitivity in overweight women with type 2 diabetes mellitus (T2DM). METHODS Twenty-eight patients were randomly assigned to control (CG, n=12), moderate intensity exercise (MEG, n=8), or vigorous intensity exercise (VEG, n=8) group. Subjects in both exercise groups completed a 12-week exercise program (MEG, 3.6 to 5.2 METs; VEG, ≥5.2 METs) that was monitored by accelerometers. We assessed body mass index (BMI), total fat area (TFA), visceral fat area (VFA), subcutaneous fat area (SFA), mid-thigh intramuscular adipose tissue (TIMAT), total skeletal muscle (TTM), low density skeletal muscle (TLDM), and normal density skeletal muscle (TNDM) using computed tomography, and measured insulin sensitivity with an insulin tolerance test (K(ITT)), before and after the intervention. RESULTS At baseline, the mean age was 53.8±7.9 years, duration of diabetes was 3.8±2.3 years, and BMI was 26.6±2.6 kg/m(2). After 12 weeks, the percent change (%C) in BMI, TIMAT, and TLDM were not different among three groups. However, %C in TFA and VFA were significantly reduced in MEG compared to CG (P=0.026 and P=0.008, respectively). %C SFA was significantly reduced in VEG compared to CG (P=0.038) and %C TTM, TNDM, and K(ITT) were significantly increased in VEG compared to the CG (P=0.044, P=0.007, and P=0.016, respectively). CONCLUSION Although there was no difference in the change in BMI among groups, TFA and VFA were more reduced in MEG, and only VEG increased TTM, TNDM, and insulin sensitivity compared to CG.
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Affiliation(s)
- Ji Yeon Jung
- Diabetes Center, Eulji General Hospital, Seoul, Korea
| | - Kyung Ah Han
- Diabetes Center, Eulji General Hospital, Seoul, Korea
- Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea
| | - Hee Jung Ahn
- Diabetes Center, Eulji General Hospital, Seoul, Korea
| | - Hwi Ryun Kwon
- Diabetes Center, Eulji General Hospital, Seoul, Korea
| | - Jae Hyuk Lee
- Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea
| | - Kang Seo Park
- Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea
| | - Kyung Wan Min
- Diabetes Center, Eulji General Hospital, Seoul, Korea
- Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea
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Green JG, Johnson NA, Sachinwalla T, Cunningham CW, Thompson MW, Stannard SR. Moderate-intensity endurance exercise prevents short-term starvation-induced intramyocellular lipid accumulation but not insulin resistance. Metabolism 2011; 60:1051-7. [PMID: 21353260 DOI: 10.1016/j.metabol.2011.01.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Revised: 01/07/2011] [Accepted: 01/10/2011] [Indexed: 12/25/2022]
Abstract
Exercise has the potential to alleviate the resistance to insulin-mediated glucose uptake precipitated by elevated circulating free fatty acids (FFAs) in conditions such as obesity, lipid infusion, and starvation. In this study, 6 lean healthy men underwent two 3-day periods of starvation with either no exercise or daily endurance exercise (80 min d(-1) at 50% maximal rate of oxygen consumption) and a 3-day mixed diet without exercise. Insulin sensitivity was determined by intravenous glucose tolerance test, and intramyocellular lipid (IMCL) concentration was measured by (1)H magnetic resonance spectroscopy. In both starvation conditions, fasting plasma FFAs were significantly elevated, whereas plasma glucose and whole-body insulin sensitivity were significantly reduced. Vastus lateralis IMCL to water ratio was significantly elevated after starvation without exercise compared with that after starvation with exercise or that after mixed diet. Intramyocellular lipid to water ratio was not different between starvation with exercise and mixed diet. In healthy lean men, exercise during starvation prevents the accumulation of IMCL yet does not affect the starvation-induced changes in FFAs and insulin sensitivity. Unlike during lipid infusion or obesity-induced insulin resistance, exercise cannot overcome the reduction in insulin action caused by starvation. We propose that carbohydrate availability is a key modulator of the combined effects of exercise and circulating FFAs on insulin sensitivity.
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Affiliation(s)
- Jackson G Green
- Research Centre for Maori Health and Development, Massey University, Palmerston North, New Zealand.
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Mori Y, Tobina T, Shirasaya K, Kiyonaga A, Shindo M, Tanaka H. Long-term effects of home-based bench-stepping exercise training on healthcare expenditure for elderly Japanese. J Epidemiol 2011; 21:363-9. [PMID: 21727758 PMCID: PMC3899435 DOI: 10.2188/jea.je20100103] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background We examined the long-term effects of home-based bench-stepping exercise training on total healthcare expenditure (TOHEX) and number of outpatient visits (NOVIS) in elderly adults. Methods A total of 189 elderly Japanese (age 73 ± 4 years) participated in this study. They were randomly assigned to either an exercise or control group. TOHEX, NOVIS, and outpatient expenditure (OPEX) were evaluated every 6 months from 1 year before the start to the end of the intervention period, as well as 1 year after the end of the intervention. The exercise group was encouraged to perform home-based bench-stepping exercise training on most, and preferably all, days of the week for 18 months. Results The exercise group showed significant increases in lactate threshold as compared with pre-intervention values. There were no significant differences in TOHEX, OPEX, or NOVIS between the exercise and control groups 1 year before the start of the intervention, and the values remained similar during the first 12 months of the intervention period. However, at 18 months, TOHEX, NOVIS, and OPEX were significantly lower in the exercise group than in the control group (TOHEX: 170 007 ± 192 072 vs. 294 705 ± 432 314 yen, P = 0.008; NOVIS: 19.2 ± 26.3 vs. 28.2 ± 32.1 days, P = 0.012; OPEX: 132 973 ± 132 016 vs. 187 799 ± 158 167 yen, P = 0.005). Conclusions The data indicate that a long-term home-based bench-stepping exercise program can reduce healthcare expenditure in elderly Japanese.
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Affiliation(s)
- Yukari Mori
- Graduate School of Sports and Health Science, Fukuoka University, Japan
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Nishida Y, Iyadomi M, Higaki Y, Tanaka H, Hara M, Tanaka K. Influence of physical activity intensity and aerobic fitness on the anthropometric index and serum uric acid concentration in people with obesity. Intern Med 2011; 50:2121-8. [PMID: 21963729 DOI: 10.2169/internalmedicine.50.5506] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND AND OBJECTIVE Physical activity (PA) is considered an important approach to prevent and treat obesity and hyperuricemia. The purpose of the present study was to examine the influence of PA intensity and aerobic fitness on anthropometric indices and serum uric acid in obese individuals. METHODS PA was examined using a single-axial accelerometer and aerobic fitness was assessed by electric cycle ergometry in obese middle-aged men (n=71, 47.2 ± 4.4 years). PA was defined as light (<3 metabolic equivalents [METs]), moderate (3.0-6.0 METs) or vigorous (>6.0 METs) intensity from the corresponding METs multiplied by time spent at the corresponding intensity levels. Serum uric acid was measured by the uricase peroxidase method. RESULTS The association between aerobic fitness index (lactate threshold) and serum uric acid did not reach statistical significance after adjustment for potential confounding factors (age, body mass index [BMI], and alcohol consumption) (β=-0.110, p=0.138). Light intensity PA was inversely associated with BMI and waist circumference, even after adjustment for age and alcohol consumption (BMI: β=-0.543, p=0.023; waist circumference: β=-1.333, p=0.016). Moderate intensity PA, but not light or vigorous intensity PA, was inversely correlated with the uric acid level and this remained significant after adjustment for age, BMI, and alcohol consumption (β=-0.222, p=0.036). CONCLUSION Our results suggest that light intensity PA may have an important role in weight control while moderate intensity PA may be associated with the lower uric acid concentrations in obese individuals.
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Affiliation(s)
- Yuichiro Nishida
- Department of Preventive Medicine, Faculty of Medicine, Saga University, Japan.
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27
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Nishida Y, Matsubara T, Tobina T, Shindo M, Tokuyama K, Tanaka K, Tanaka H. Effect of low-intensity aerobic exercise on insulin-like growth factor-I and insulin-like growth factor-binding proteins in healthy men. Int J Endocrinol 2010; 2010:452820. [PMID: 20885914 PMCID: PMC2946576 DOI: 10.1155/2010/452820] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 07/06/2010] [Accepted: 09/02/2010] [Indexed: 12/31/2022] Open
Abstract
Increased concentrations of circulating insulin-like growth factor-I (IGF-I) or IGF-I relative to IGF-binding proteins (IGFBPs) are associated with increased risk of developing several forms of cancer. Conversely, exercise is linked with reduced risk. This study aims to investigate the effect of a low-intensity exercise program on circulating levels of IGF-I, IGFBP-1, and IGFBP-3, in previously sedentary males. Fourteen healthy men participated in cycle ergometer training at lactate threshold intensity for 60 min/day, 5 days/week for 6 weeks. After aerobic training, insulin sensitivity improved by 20%, while fasting insulin levels decreased by 13%. Simultaneously, low-intensity aerobic training decreased the circulating levels of IGF-I by 9%, while IGFBP-1 levels increased by 16%. An interesting finding was that higher pretraining level of IGF-I was associated with greater decline in IGF-I with training. Insulin-sensitizing low-intensity aerobic exercise is thus considered to be an effective method for downregulating IGF-I and upregulating IGFBP-1 levels.
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Affiliation(s)
- Yuichiro Nishida
- Laboratory of Exercise Physiology, Faculty of Health and Sports Science, Fukuoka University, Fukuoka 814-0180, Japan
- Department of Preventive Medicine, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga 849-8501, Japan
| | | | - Takuro Tobina
- Laboratory of Exercise Physiology, Faculty of Health and Sports Science, Fukuoka University, Fukuoka 814-0180, Japan
| | - Munehiro Shindo
- Laboratory of Exercise Physiology, Faculty of Health and Sports Science, Fukuoka University, Fukuoka 814-0180, Japan
| | - Kumpei Tokuyama
- Laboratory of Biochemistry of Exercise and Nutrition, Institute of Health and Sport Sciences, University of Tsukuba, Ibaraki 305-8574, Japan
| | - Keitaro Tanaka
- Department of Preventive Medicine, Faculty of Medicine, Saga University, 5-1-1 Nabeshima, Saga 849-8501, Japan
| | - Hiroaki Tanaka
- Laboratory of Exercise Physiology, Faculty of Health and Sports Science, Fukuoka University, Fukuoka 814-0180, Japan
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Garg M, Thamotharan M, Oak SA, Pan G, Maclaren DC, Lee PWN, Devaskar SU. Early exercise regimen improves insulin sensitivity in the intrauterine growth-restricted adult female rat offspring. Am J Physiol Endocrinol Metab 2009; 296:E272-81. [PMID: 19001551 PMCID: PMC2645014 DOI: 10.1152/ajpendo.90473.2008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We examined the effect of early exercise training (Ex) on glucose kinetics, basal, and insulin-stimulated skeletal muscle (SKM) plasma membrane (PM) GLUT4 in pre- and/or postnatal nutrient-restricted adult rat offspring compared with sedentary (Sed) state. Pregestational control female (Ex CON vs. Sed CON) and offspring exposed to prenatal (Ex IUGR vs. Sed IUGR), postnatal (Ex PNGR vs. Sed PNGR), or pre- and postnatal (Ex IUGR + PNGR vs. Sed IUGR + PNGR) nutrient restriction were studied. The combined effect of exercise and pre/postnatal nutrition in the Ex IUGR demonstrated positive effects on basal and glucose-stimulated plasma insulin response (GSIR) with suppression of endogenous hepatic glucose production (HGP) compared with sedentary state. Ex PNGR was hyperglycemic after glucose challenge with no change in glucose-stimulated insulin production or HGP compared with sedentary state. Ex IUGR + PNGR remained glucose tolerant with unchanged glucose-stimulated insulin production but increased endogenous HGP compared with sedentary state. Basal SKM PM-associated GLUT4 was unchanged by exercise in all four groups. Whereas Ex PNGR and Ex IUGR + PNGR insulin responsiveness was similar to that of Ex CON, Ex IUGR remained nonresponsive to insulin. Early introduction of regular Ex in the pregestational female offspring had a positive effect on hepatic adaptation to GSIR and HGP in IUGR and IUGR + PNGR, with no effect in PNGR. Change in insulin responsiveness of SKM GLUT4 translocation was observed in exercised IUGR + PNGR and PNGR but not in exercised IUGR.
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Affiliation(s)
- Meena Garg
- Division of Neonatology and Developmental Biology, Neonatal Research Center, Department of Pediatrics, David Geffen School of Medicine, UCLA, Los Angeles, CA 90095-1752, USA
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Kwon HR, Ku YH, Ahn HJ, Jeong JY, Ryu SR, Koo BK, Han KA, Min KW. Maximal Muscle Strength Deteriorates with Age in Subjects with Type 2 Diabetes Mellitus. KOREAN DIABETES JOURNAL 2009. [DOI: 10.4093/kdj.2009.33.5.412] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Yun Hyi Ku
- Department of Internal Medicine, Eulji University College of Medicine, Daejeon, Korea
| | | | | | - Sang Ryol Ryu
- Department of Internal Medicine, Eulji University College of Medicine, Daejeon, Korea
| | - Bo Kyung Koo
- Department of Internal Medicine, Seoul University College of Medicine, Seoul, Korea
| | - Kyung Ah Han
- Department of Internal Medicine, Eulji University College of Medicine, Daejeon, Korea
| | - Kyung Wan Min
- Department of Internal Medicine, Eulji University College of Medicine, Daejeon, Korea
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Ku YH, Koo BK, Ahn HJ, Jeong JY, Seok HG, Kim HC, Han KA, Min KW. Effects of Aerobic Exercise Intensity on Insulin Resistance in Patients with Type 2 Diabetes Mellitus. KOREAN DIABETES JOURNAL 2009. [DOI: 10.4093/kdj.2009.33.5.401] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Yun Hyi Ku
- Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea
| | - Bo-Kyung Koo
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | | | | | | | - Ho-Chul Kim
- Department of Radiology, Eulji University School of Medicine, Daejeon, Korea
| | - Kyung-Ah Han
- Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea
| | - Kyung-Wan Min
- Department of Internal Medicine, Eulji University School of Medicine, Daejeon, Korea
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Michishita R, Shono N, Kasahara T, Tsuruta T. Effects of low intensity exercise therapy on early phase insulin secretion in overweight subjects with impaired glucose tolerance and type 2 diabetes mellitus. Diabetes Res Clin Pract 2008; 82:291-7. [PMID: 18922594 DOI: 10.1016/j.diabres.2008.08.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Revised: 08/11/2008] [Accepted: 08/14/2008] [Indexed: 11/22/2022]
Abstract
This study was designed to evaluate effects of exercise therapy on early phase insulin secretion in overweight subjects with impaired glucose tolerance (IGT) and type 2 diabetes mellitus (DM). The subjects consisted of overweight subjects with normal glucose tolerance (NGT, n=10), IGT (n=10) and DM (n=10) (age: 51.1+/-8.2, 56.3+/-8.8 and 58.5+/-6.2 years, respectively). All of these patients performed exercise therapy at lactate threshold intensity for 12 weeks. Before intervention, area under the glucose curve (AUC(PG)) was higher in DM, IGT and NGT groups, and area under the insulin curve (AUC(IRI)) and the early phase insulin secretion as calculated by insulinogenic index was higher in the NGT group than in either the IGT or DM groups (p<0.05). After exercise therapy, the insulin sensitivity, AUC(PG) and AUC(IRI) improved in three groups (p<0.05, respectively). The insulinogenic index increased in IGT and DM groups (p<0.05, respectively), but the changes in the insulinogenic index showed no significant differences between IGT and DM groups. These results suggest that the ss-cell function in subjects with IGT and DM could therefore improve after exercise therapy. Moreover, AUC(PG), AUC(IRI) and insulin sensitivity were also improved no relation to NGT, IGT and DM.
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Bordenave S, Brandou F, Manetta J, Fédou C, Mercier J, Brun JF. Effects of acute exercise on insulin sensitivity, glucose effectiveness and disposition index in type 2 diabetic patients. DIABETES & METABOLISM 2008; 34:250-7. [DOI: 10.1016/j.diabet.2007.12.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Revised: 11/16/2007] [Accepted: 12/03/2007] [Indexed: 10/22/2022]
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Ekelund U, Franks PW, Sharp S, Brage S, Wareham NJ. Increase in physical activity energy expenditure is associated with reduced metabolic risk independent of change in fatness and fitness. Diabetes Care 2007; 30:2101-6. [PMID: 17536069 DOI: 10.2337/dc07-0719] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE We sought to examine whether change in physical activity energy expenditure (PAEE) is associated with change in metabolic risk factors and whether this association is independent of change in fat mass and aerobic fitness. RESEARCH DESIGN AND METHODS In a population-based sample of 176 men and 217 women followed prospectively for 5.6 years, we measured PAEE by individually calibrated heart rate monitoring, aerobic fitness, total body fat (fat mass), and metabolic risk factors (blood pressure, fasting triglycerides, HDL cholesterol, insulin, and 2-h glucose) at baseline and follow-up. RESULTS A 100 J x kg fat-free mass (FFM)(-1) x min(-1) increase in PAEE from baseline to follow-up reduced triglycerides by 3.5% (95% CI 0.03-5.7) in men and 3.2% (0.02-5.4) in women, fasting insulin by 5.3% (1.0-7.5) in men and women, and 2-h glucose by 3.2% (0.3-5.3) in men and 3.1% (0.3-5.2) in women, after adjustment for sex, age, smoking status, aerobic fitness, baseline phenotype, and change in fat mass. In general, the magnitudes of association for change in fat mass with metabolic risk factors were two to three times stronger than for PAEE. CONCLUSIONS Increasing levels of physical activity may protect against metabolic disease even in the absence of improved aerobic fitness and reduced body fatness. Therefore, the combination of increasing levels of physical activity and avoidance of gain in fat mass is likely to be the most successful approach for preventing cardiovascular and metabolic disease.
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Affiliation(s)
- Ulf Ekelund
- MRC Epidemiology Unit, Elsie Widdowson Laboratory, Fulbourne Road, CB1 9NL, Cambridge, U.K.
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Martins C, Truby H, Morgan LM. Short-term appetite control in response to a 6-week exercise programme in sedentary volunteers. Br J Nutr 2007; 98:834-42. [PMID: 17532862 DOI: 10.1017/s000711450774922x] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Previous cross-sectional studies have shown that sedentary males, unlike their active counterparts, are unable to compensate for previous energy intake (EI). The present study therefore investigated the effects of a 6-week moderate exercise programme (4 times per week, 65-75 % maximal heart rate) on appetite regulation in healthy sedentary volunteers using a longitudinal design. EI at a buffet meal 60 min after high-energy (HEP; 607 kcal) and low-energy (LEP; 246 kcal) preloads, together with 24 h cumulative EI, were measured in twenty-five healthy volunteers (eleven men; mean age 30 (SD 12) years, mean BMI 22.7 (SD 2.3) kg/m2), at baseline and after the exercise intervention. Subjective hunger and fullness were assessed throughout using visual analogue scales. ANOVA showed a significant preload x exercise interaction on 24 h cumulative EI, supporting an improvement in appetite control over this time period with the exercise programme. There was a trend towards improvement in energy compensation over the same period (8.9 (SD 118.5) % v. 79.5 (SD 146..4) %; P = 0.056). No preload x exercise interaction was observed for buffet EI. Secondary analysis, however, showed that although buffet EI after the two preloads was not significantly different at baseline, buffet EI after the HEP was significantly lower than after the LEP following the exercise intervention. The improvement in short-term appetite control with exercise was not explained by changes in subjective hunger or satiety. This longitudinal study supports the original cross-sectional findings and suggests that exercise may have a significant impact on short-term appetite control by leading to a more sensitive eating behaviour in response to previous EI. Further studies are needed to clarify the mechanisms involved.
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Affiliation(s)
- Catia Martins
- Division of Nutrition, Dietetics and Food Science, School of Biomedical and Molecular Sciences, University of Surrey Guildford, Surrey GU2 7XH UK
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36
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Colberg SR. The impact of exercise on insulin action in type 2 diabetes mellitus: Relationship to prevention and control. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/s1557-0843(06)80018-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Carr DB, Utzschneider KM, Boyko EJ, Asberry PJ, Hull RL, Kodama K, Callahan HS, Matthys CC, Leonetti DL, Schwartz RS, Kahn SE, Fujimoto WY. A reduced-fat diet and aerobic exercise in Japanese Americans with impaired glucose tolerance decreases intra-abdominal fat and improves insulin sensitivity but not beta-cell function. Diabetes 2005; 54:340-7. [PMID: 15677490 DOI: 10.2337/diabetes.54.2.340] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Lifestyle modification reduces the risk of developing type 2 diabetes and may have its effect through improving insulin sensitivity, beta-cell function, or both. To determine whether diet and exercise improve insulin sensitivity and/or beta-cell function and to evaluate these effects over time, we quantified insulin sensitivity and the acute insulin response to glucose (AIRg) in 62 Japanese Americans (age 56.5 +/- 1.3 years; mean +/- SE) with impaired glucose tolerance (IGT) who were randomized to the American Heart Association (AHA) Step 2 diet plus endurance exercise (n = 30) versus the AHA Step 1 diet plus stretching (n = 32) for 24 months. beta-Cell function (disposition index [DI]) was calculated as S(i) x AIRg, where S(i) is the insulin sensitivity index. The incremental area under the curve for glucose (incAUCg) was calculated from a 75-g oral glucose tolerance test. Intra-abdominal fat (IAF) and subcutaneous fat (SCF) areas were measured by computed tomography. At 24 months, the Step 2/endurance group had lower weight (63.1 +/- 2.4 vs. 71.3 +/- 2.9 kg; P = 0.004) and IAF (75.0 +/- 7.9 vs. 112.7 +/- 10.4 cm(2); P = 0.03) and SCF (196.5 +/- 18.0 vs. 227.7 +/- 19.9 cm(2); P < 0.001) areas, greater S(i) (4.7 +/- 0.5 vs. 3.3 +/- 0.3 x 10(-5) min . pmol(-1) . l(-1); P = 0.01), and a trend toward lower AIRg (294.9 +/- 50.0 vs. 305.4 +/- 30.0 pmol/l; P = 0.06) and incAUCg (8,217.3 +/- 350.7 vs. 8,902.0 +/- 367.2 mg . dl(-1) . 2 h(-1); P = 0.08) compared with the Step 1/stretching group after adjusting for baseline values. There was no difference in the DI (P = 0.7) between the groups. S(i) was associated with changes in weight (r = -0.426, P = 0.001) and IAF (r = -0.395, P = 0.003) and SCF (r = -0.341, P = 0.01) areas. Thus, the lifestyle modifications decreased weight and central adiposity and improved insulin sensitivity in Japanese Americans with IGT. However, such changes did not improve beta-cell function, suggesting that this degree of lifestyle modifications may be limited in preventing type 2 diabetes over the long term.
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Affiliation(s)
- Darcy B Carr
- Department of ObstetricsGynecology, University of Washington, Seattle, WA 98195-6460, USA.
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Phillips SM, Stewart BG, Mahoney DJ, Hicks AL, McCartney N, Tang JE, Wilkinson SB, Armstrong D, Tarnopolsky MA. Body-weight-support treadmill training improves blood glucose regulation in persons with incomplete spinal cord injury. J Appl Physiol (1985) 2004; 97:716-24. [PMID: 15107410 DOI: 10.1152/japplphysiol.00167.2004] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The impact of a 6-mo body-weight-supported treadmill training program on glucose homeostasis and muscle metabolic characteristics was investigated. Nine individuals (31 ± 3 yr, 8.1 ± 2.5 yr postinjury; means ± SE) with incomplete spinal cord injury trained three times weekly for a total of 6 mo. Training session duration and intensity (velocity) increased by 54 ± 10% ( P < 0.01) and 135 ± 20%, respectively. Muscle biopsies and a modified glucose tolerance test (100 g glucose with [U-13C]glucose) were performed before (Pre) and after training (Post). Training resulted in a reduction in area under the curve of glucose × time (−15 ± 4%) and insulin × time (−33 ± 8%; both P < 0.05). Oxidation of exogenous (ingested) glucose increased as a result of training (Pre = 4.4 ± 0.7 g/h, Post = 7.4 ± 0.6 g/h; P < 0.05), as did oxidation of endogenous (liver) glucose (Pre = 3.8 ± 0.3 g/h, Post = 5.2 ± 0.3 g/h; P < 0.05). Training resulted in increased muscle glycogen (80 ± 23%; P < 0.05) and GLUT-4 content and hexokinase II enzyme activity (126 ± 34 and 49 ± 4%, respectively, both P < 0.01). Resting muscle phosphocreatine content also increased after training (Pre = 62.1 ± 4.3, Post = 78.7 ± 3.8, both mmol/kg dry wt and P < 0.05). Six months of thrice-weekly body-weight-supported treadmill training in persons with an incomplete spinal cord injury improved blood glucose regulation by increasing oxidation and storage of an oral glucose load. Increases in the capacity for transport and phosphorylation glucose in skeletal muscle likely play a role in these adaptations.
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Affiliation(s)
- Stuart M Phillips
- Department of Kinesiology, Exercise and Metabolism Research Group, Centre for Health Promotion and Rehabilitation, McMaster University, 1280 Main St. West, Hamilton, ON, Canada L8S 4K1.
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Nishida Y, Tokuyama K, Nagasaka S, Higaki Y, Shirai Y, Kiyonaga A, Shindo M, Kusaka I, Nakamura T, Ishibashi S, Tanaka H. Effect of moderate exercise training on peripheral glucose effectiveness, insulin sensitivity, and endogenous glucose production in healthy humans estimated by a two-compartment-labeled minimal model. Diabetes 2004; 53:315-20. [PMID: 14747280 DOI: 10.2337/diabetes.53.2.315] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
For examining the effects of moderate exercise training on peripheral glucose effectiveness (S(g)(2)*), insulin sensitivity (S(i)(2)*), and endogenous glucose production (EGP), seven men and one woman (24.8 +/- 1.8 years) participated in cycle ergometer training at lactate threshold intensity for 60 min/day, 5 days/week for 12 weeks. Stable-labeled frequently sampled intravenous glucose tolerance tests were performed before and 16 h and 1 week after the last training session. S(g)(2)* (pre 0.71 +/- 0.03 x 10(-2), 16 h 0.85 +/- 0.02 x 10(-2) dl. kg(-1). min(-1)) and S(i)(2)* (pre 12.6 +/- 2.6 x 10(-4), 16 h 19.7 +/- 3.3 x 10(-4) dl. kg(-1). min(-1). [ micro U/ml](-1)), analyzed using the two-compartment minimal model, were significantly elevated 16 h after the last training session. The elevated S(g)(2)* remained higher despite the cessation of exercise training for 1 week (1.00 +/- 0.03 x 10(-2) dl. kg(-1). min(-1)). EGP was suppressed within 20 min after glucose bolus, and the suppression of EGP was followed by their overshoot. The time course of EGP during the intravenous glucose tolerance test remained similar after the training period. In conclusion, moderate exercise training at lactate threshold improves not only peripheral insulin sensitivity but also peripheral glucose effectiveness with no change in the effect of glucose and/or insulin to suppress EGP in healthy humans.
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Affiliation(s)
- Yuichiro Nishida
- Laboratory of Exercise Physiology, Faculty of Health and Sports Science, Fukuoka University, Fukuoka, Japan
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Yatagai T, Nishida Y, Nagasaka S, Nakamura T, Tokuyama K, Shindo M, Tanaka H, Ishibashi S. Relationship between exercise training-induced increase in insulin sensitivity and adiponectinemia in healthy men. Endocr J 2003; 50:233-8. [PMID: 12803245 DOI: 10.1507/endocrj.50.233] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Circulating concentrations of adiponectin, an adipocyte-derived protein, are increased by thiazolidinediones and by weight reduction, accompanied with improvement in insulin sensitivity. The effect of exercise training, another therapy to increase insulin sensitivity (SI), on adiponectinemia is currently unclear. The present study was undertaken to clarify whether exercise training-induced increase in SI is related to changes in adiponectinemia in healthy men. Twelve healthy non-obese men underwent ergometer training at lactate threshold (LT) intensity for 60 min/day for 5 days/week for 6 weeks. An insulin-modified intravenous glucose tolerance test was performed before and at 16 h and 1 week after the last training session to determine SI using a minimal-model approach. Serum levels of adiponectin were determined at the same time. After the exercise training, VO2max and LT were significantly increased by 7.2% and 22.3% (P<0.01), while BMI and body fat mass remained unchanged. SI was significantly increased at 16 h after the last training session (from 7.0 +/- 3.1 to 9.6 +/- 3.6 [x 10(-4) x (microU/ml)(-1) x min(-1)], P<0.01), but returned toward the basal levels at 1 week after the cessation of the training. Serum adiponectin concentrations before the training (20.9 +/- 7.4 microg/ml) were positively correlated with SI. The concentrations were slightly but significantly decreased at 16 h (17.2 +/- 6.6 microg/ml, P<0.05), and returned to the basal values at 1 week after the training. From these results, it can be concluded that exercise training-induced increase in SI is not dependent on the increase in adiponectinemia in healthy men.
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Affiliation(s)
- Toshimitsu Yatagai
- Division of Endocrinology and Metabolism, Jichi Medical School, Minamikawachi, Tochigi 329-0498, Japan
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Iglesias MA, Ye JM, Frangioudakis G, Saha AK, Tomas E, Ruderman NB, Cooney GJ, Kraegen EW. AICAR administration causes an apparent enhancement of muscle and liver insulin action in insulin-resistant high-fat-fed rats. Diabetes 2002; 51:2886-94. [PMID: 12351423 DOI: 10.2337/diabetes.51.10.2886] [Citation(s) in RCA: 232] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Exercise improves insulin sensitivity. As AMP-activated protein kinase (AMPK) plays an important role in muscle metabolism during exercise, we investigated the effects of the AMPK activator 5-aminoimidazole-4-carboxamide-1-beta-D-ribofuranoside (AICAR) on insulin action in insulin-resistant high-fat-fed (HF) rats. Rats received a subcutaneous injection of 250 mg/kg AICAR (HF-AIC) or saline (HF-Con). The next day, euglycemic-hyperinsulinemic clamp studies were performed. Glucose infusion rate during the clamp was enhanced (50%) in HF-AIC compared with HF-Con rats. Insulin-stimulated glucose uptake was improved in white but not in red quadriceps, whereas glycogen synthesis was improved in both red and white quadriceps of HF-AIC rats. HF-AIC rats also showed increased insulin suppressibility of hepatic glucose output (HGO). AICAR-induced responses in both liver and muscle were accompanied by reduced malonyl-CoA content. Clamp HGO correlated closely with hepatic triglyceride content (r = 0.67, P < 0.01). Thus, a single dose of AICAR leads to an apparent enhancement in whole-body, muscle, and liver insulin action in HF rats that extends beyond the expected time of AMPK activation. Whether altered tissue lipid metabolism mediates AICAR effects on insulin action remains to be determined. Follow-up studies suggest that at least some of the post-AICAR insulin-enhancing effects also occur in normal rats. Independent of this, the results suggest that pharmacological activation of AMPK may have potential in treating insulin-resistant states and type 2 diabetes.
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Affiliation(s)
- Miguel A Iglesias
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia
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Booth FW, Chakravarthy MV, Gordon SE, Spangenburg EE. Waging war on physical inactivity: using modern molecular ammunition against an ancient enemy. J Appl Physiol (1985) 2002; 93:3-30. [PMID: 12070181 DOI: 10.1152/japplphysiol.00073.2002] [Citation(s) in RCA: 262] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
A hypothesis is presented based on a coalescence of anthropological estimations of Homo sapiens' phenotypes in the Late Paleolithic era 10,000 years ago, with Darwinian natural selection synergized with Neel's idea of the so-called thrifty gene. It is proposed that humans inherited genes that were evolved to support a physically active lifestyle. It is further postulated that physical inactivity in sedentary societies directly contributes to multiple chronic health disorders. Therefore, it is imperative to identify the underlying genetic and cellular/biochemical bases of why sedentary living produces chronic health conditions. This will allow society to improve its ability to effect beneficial lifestyle changes and hence improve the overall quality of living. To win the war against physical inactivity and the myriad of chronic health conditions produced because of physical inactivity, a multifactorial approach is needed, which includes successful preventive medicine, drug development, optimal target selection, and efficacious clinical therapy. All of these approaches require a thorough understanding of fundamental biology and how the dysregulated molecular circuitry caused by physical inactivity produces clinically overt disease. The purpose of this review is to summarize the vast armamentarium at our disposal in the form of the extensive scientific basis underlying how physical inactivity affects at least 20 of the most deadly chronic disorders. We hope that this information will provide readers with a starting point for developing additional strategies of their own in the ongoing war against inactivity-induced chronic health conditions.
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Affiliation(s)
- Frank W Booth
- Department of Veterinary Biomedical Sciences, University of Missouri, Columbia 65211, USA.
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Nazliel B, Yetkin I, Irkeç C, Koçer B. Current literature in diabetes. Diabetes Metab Res Rev 2001; 17:402-9. [PMID: 11747147 DOI: 10.1002/dmrr.173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of diabetes/metabolism. Each bibliography is divided into 17 sections: 1 Books, Reviews & Symposia; 2 General; 3 Genetics; 4 Epidemiology; 5 Immunology; 6 Prediction; 7 Prevention; 8 INTERVENTION: a&rpar General; b&rpar Pharmacology; 9 Pathology: a&rpar General; b&rpar Cardiovascular; c&rpar Neurological; d&rpar Renal; 10 Endocrinology & Metabolism; 11 Nutrition; 12 Animal Studies; 13 Techniques. Within each section, articles are listed in alphabetical order with respect to author (9 Weeks journals - Search completed at 1st Aug 2001)
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Affiliation(s)
- B Nazliel
- Department of Neurology, Gazi University Faculty of Medicine, Ankara, Turkey
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