1
|
Thomas E, Ficarra S, Nakamura M, Drid P, Trivic T, Bianco A. The Effects of Stretching Exercise on Levels of Blood Glucose: A Systematic Review with Meta-Analysis. SPORTS MEDICINE - OPEN 2024; 10:15. [PMID: 38334888 PMCID: PMC10858005 DOI: 10.1186/s40798-023-00661-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 11/17/2023] [Indexed: 02/10/2024]
Abstract
BACKGROUND Physical activity plays an important role in the management of blood glucose levels. However, compelling evidence exists only for aerobic and resistance training. In this review, we aimed to identify the potential effects of stretching exercises on blood glucose levels. METHODS A systematic literature search was performed using the following databases: Scopus, NLM PubMed, and Web of Science. Studies regarding the effects of stretching exercise in humans on blood glucose or any related variable were included. Further inclusion criteria were: (1) original articles (published from database inception to October 2022), (2) applying stretching as a unique exercise modality, (3) having either longitudinal or acute interventions, (4) including healthy and pathological populations, and (5) having within each study a pre- and post-intervention measure. Quality assessment of the studies was conducted using the Downs and Black checklist. RESULTS A total of 13 articles were included. The quality assessment revealed an overall moderate quality of the included records. Ten articles included patients with type 2 diabetes (T2D), whereas the remaining three included at-risk populations. A total of 731 people with a mean age of 56.7 ± 6.1 years old were analysed. Fasting blood glucose, 2 h post-oral glucose uptake, post-stretching intervention blood glucose levels, and HbA1c were identified as variables related to blood glucose within the studies. After the stretching interventions, a significant reduction was observed in either blood glucose (ES = - 0.79; p = 0.0174) or HbA1c (ES = - 1.11; p = < 0.0001). Meta-analytic results highlighted greater effects in T2D patients (ES = - 1.15; p = 0.02) and for studies applying stretching as an exercise intervention (ES = - 1.27; p = 0.006) rather than considering stretching as a control exercise modality. CONCLUSION The results of this systematic review highlight the potential of stretching exercises to reduce blood glucose levels. In particular, if stretching is applied as a specific form of exercise intervention in patients with T2D greater effects are observed. However, further studies with more solid research designs are required, therefore, caution is needed before prescribing stretching as an exercise intervention for glycaemic management.
Collapse
Affiliation(s)
- Ewan Thomas
- Sport and Exercise Sciences Research Unit, Department of Psychology, Educational Science and Human Movement, University of Palermo, Via Giovanni Pascoli 6, 90144, Palermo, Italy.
| | - Salvatore Ficarra
- Sport and Exercise Sciences Research Unit, Department of Psychology, Educational Science and Human Movement, University of Palermo, Via Giovanni Pascoli 6, 90144, Palermo, Italy
| | - Masatoshi Nakamura
- Faculty of Rehabilitation Sciences, Nishi Kyushu University, 4490-9 Ozaki, Kanzaki, Saga, 842-8585, Japan
| | - Patrik Drid
- Faculty of Sport and Physical Education, University of Novi Sad, 21000, Novi Sad, Serbia
| | - Tatjana Trivic
- Faculty of Sport and Physical Education, University of Novi Sad, 21000, Novi Sad, Serbia
| | - Antonino Bianco
- Sport and Exercise Sciences Research Unit, Department of Psychology, Educational Science and Human Movement, University of Palermo, Via Giovanni Pascoli 6, 90144, Palermo, Italy
| |
Collapse
|
2
|
Zakharova AN, Milovanova KG, Orlova AA, Dyakova EY, Kalinnikova JG, Kollantay OV, Shuvalov IY, Chibalin AV, Kapilevich LV. Effects of Treadmill Running at Different Light Cycles in Mice with Metabolic Disorders. Int J Mol Sci 2023; 24:15132. [PMID: 37894813 PMCID: PMC10606442 DOI: 10.3390/ijms242015132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/04/2023] [Accepted: 09/06/2023] [Indexed: 10/29/2023] Open
Abstract
Type 2 diabetes mellitus accounts for about 90% of cases of diabetes and is considered one of the most important problems of our time. Despite a significant number of studies on glucose metabolism, the molecular mechanisms of its regulation in health and disease remain insufficiently studied. That is why non-drug treatment of metabolic disorders is of great relevance, including physical activity. Metabolic changes under the influence of physical activity are very complex and are still difficult to understand. This study aims to deepen the understanding of the effect of physical exercise on metabolic changes in mice with diabetes mellitus. We studied the effect of forced treadmill running on body weight and metabolic parameters in mice with metabolic disorders. We developed a high-fat-diet-induced diabetic model of metabolic disorders. We exposed mice to forced treadmill running for 4 weeks. We determined glucose and insulin levels in the blood plasma biochemically and analyzed Glut-4 and citrate synthase in M. gastrocnemius muscle tissue using Western blotting. The research results show that daily treadmill running has different effects on different age groups of mice with metabolic disorders. In young-age animals, forced running has a more pronounced effect on body weight. At week 12, young obese mice had a 17% decrease in body weight. Body weight did not change in old mice. Moreover, at weeks 14 and 16, the decrease in body weight was more significant in the young mice (by 17%) compared to the old mice (by 6%) (p < 0.05). In older animals, it influences the rate of glucose uptake. At 60 min, the blood glucose in the exercised older mice decreased to 14.46 mmol/L, while the glucose concentration in the non-exercised group remained at 17 mmol/L. By 120 min, in mice subjected to exercise, the blood glucose approached the initial value (6.92 mmol/L) and amounted to 8.35 mmol/L. In the non-exercised group, this difference was 45%. The effects of physical activity depend on the time of day. The greater effect is observed when performing shift training or exercise during the time when animals are passive (light phase). In young mice, light phase training had a significant effect on increasing the content of Glut-4 in muscle tissue (84.3 ± 11.3%, p < 0.05 with control group-59.3 ± 7.8%). In aged mice, shift training caused an increase in the level of Glut-4 in muscle tissue (71.3 ± 4.1%, p < 0.05 with control group-56.4 ± 10,9%). In the group of aged mice, a lower CS level was noticed in all groups in comparison with young mice. It should also be noted that we observed that CS increased during exercise in the group of young mice, especially during light phase training. The CS content in the light phase subgroup (135.8 ± 7.0%) was higher than in the dark phase subgroup (113.3 ± 7.7%) (p = 0.0006). The CS decreased in aged chow-fed mice and increased in the high-fat-fed group. The CS content in the chow diet group (58.2 ± 5.0%) was 38% lower than in the HFD group (94.9 ± 8.8%).
Collapse
Affiliation(s)
- Anna Nikolaevna Zakharova
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
| | - Kseniya Gennadievna Milovanova
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
| | - Anna Alekseevna Orlova
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
| | - Elena Yuryevna Dyakova
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
| | - Julia Gennadievna Kalinnikova
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
| | - Olesya Vadimovna Kollantay
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
| | - Igor Yurievich Shuvalov
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
| | - Alexander Valerievich Chibalin
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
- Department of Molecular Medicine and Surgery, Section of Integrative Physiology, Karolinska Institutet, 17177 Stockholm, Sweden
| | - Leonid Vladimirovich Kapilevich
- Department of Sport Tourism, Sport Physiology and Medicine, National Research Tomsk State University, 634050 Tomsk, Russia; (K.G.M.); (A.A.O.); (E.Y.D.); (J.G.K.); (O.V.K.); (I.Y.S.); (A.V.C.); (L.V.K.)
- Central Research Laboratory, Siberian State Medical University, 634050 Tomsk, Russia
| |
Collapse
|
3
|
Romeres D, Schiavon M, Basu A, Cobelli C, Basu R, Dalla Man C. Exercise effect on insulin-dependent and insulin-independent glucose utilization in healthy individuals and individuals with type 1 diabetes: a modeling study. Am J Physiol Endocrinol Metab 2021; 321:E122-E129. [PMID: 33998292 PMCID: PMC8321821 DOI: 10.1152/ajpendo.00084.2021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Exercise effects (EE) on whole body glucose rate of disappearance (Rd) occur through insulin-independent (IIRd) and insulin-dependent (IDRd) mechanisms. Quantifying these processes in vivo would allow a better understanding of the physiology of glucose regulation. This is of particular importance in individuals with type 1 diabetes (T1D) since such a knowledge may help to improve glucose management. However, such a model is still lacking. Here, we analyzed data from six T1D and six nondiabetic (ND) subjects undergoing a labeled glucose clamp study during, before, and after a 60-min exercise session at 65% V̇o2max on three randomized visits: euglycemia-low insulin, euglycemia-high insulin, and hyperglycemia-low insulin. We tested a set of models, all sharing a single-compartment description of glucose kinetics, but differing in how exercise is assumed to modulate glucose disposal. Model selection was based on parsimony criteria. The best model assumed an exercise-induced immediate effect on IIRd and a delayed effect on IDRd. It predicted that exercise increases IIRd, compared with rest, by 66%-82% and 67%-97% in T1D and ND, respectively, not significantly different between the two groups. Conversely, the exercise effect on IDRd ranged between 81% and 155% in T1D and it was significantly higher than ND, which ranged between 10% and 40%. The exaggerated effect observed in IDRd can explain the higher hypoglycemia risk related to individuals with T1D. This novel exercise model could help in informing safe and effective glucose management during and after exercise in individuals with T1D.NEW & NOTEWORTHY Here, we present a new mathematical model describing the effect of moderate physical activity on insulin-mediated and noninsulin-mediated glucose disposal in subjects with and without diabetes. We believe that this represents a step-forward in the knowledge of type 1 diabetes pathophysiology, and an useful tool to design safe and effective insulin-therapies.
Collapse
Affiliation(s)
- Davide Romeres
- Department of Information Engineering, University of Padova, Padova, Italy
| | - Michele Schiavon
- Department of Information Engineering, University of Padova, Padova, Italy
| | - Ananda Basu
- Division of Endocrinology, University of Virginia School of Medicine, Charlottesville, Virginia
| | - Claudio Cobelli
- Department of Woman and Child's Health, University of Padova, Padova, Italy
| | - Rita Basu
- Division of Endocrinology, University of Virginia School of Medicine, Charlottesville, Virginia
| | - Chiara Dalla Man
- Department of Information Engineering, University of Padova, Padova, Italy
| |
Collapse
|
4
|
Park SH, Kim CG. Effects of aerobic exercise on waist circumference, VO 2 max, blood glucose, insulin and lipid index in middle-aged women: A meta-analysis of randomized controlled trials. Health Care Women Int 2021; 43:1158-1180. [PMID: 33825676 DOI: 10.1080/07399332.2021.1900190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
This study confirms the effectiveness of aerobic exercise on waist circumference, Vo2 max, blood glucose, insulin, serum lipid in middle-aged women. The Ovid-Medline, Embase, the Cochrane Library, and CINAHL were searched. The risk of bias 2 revised in 2019 was used to assess the risk of bias in randomized controlled trials (RCTs). Selected studies were meta-analyzed with Review Manager 5.3. Data were compiled from 15 RCTs comprising 1,110 participants. Overall, aerobic exercise reduced waist circumference and blood glucose, and increased VO2 max significantly. We recommend the application of aerobic exercise to prevent metabolic disease in middle-aged women.
Collapse
Affiliation(s)
- Seong-Hi Park
- School of Nursing, Soonchunhyang University, Shinchang-myeon, Asan, Republic of Korea
| | - Chul-Gyu Kim
- Department of Nursing, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea
| |
Collapse
|
5
|
Adams JA, Uryash A, Lopez JR, Sackner MA. The Endothelium as a Therapeutic Target in Diabetes: A Narrative Review and Perspective. Front Physiol 2021; 12:638491. [PMID: 33708143 PMCID: PMC7940370 DOI: 10.3389/fphys.2021.638491] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 01/29/2021] [Indexed: 12/18/2022] Open
Abstract
Diabetes has reached worldwide epidemic proportions, and threatens to be a significant economic burden to both patients and healthcare systems, and an important driver of cardiovascular mortality and morbidity. Improvement in lifestyle interventions (which includes increase in physical activity via exercise) can reduce diabetes and cardiovascular disease mortality and morbidity. Encouraging a population to increase physical activity and exercise is not a simple feat particularly in individuals with co-morbidities (obesity, heart disease, stroke, peripheral vascular disease, and those with cognitive and physical limitations). Translation of the physiological benefits of exercise within that vulnerable population would be an important step for improving physical activity goals and a stopgap measure to exercise. In large part many of the beneficial effects of exercise are due to the introduction of pulsatile shear stress (PSS) to the vascular endothelium. PSS is a well-known stimulus for endothelial homeostasis, and induction of a myriad of pathways which include vasoreactivity, paracrine/endocrine function, fibrinolysis, inflammation, barrier function, and vessel growth and formation. The endothelial cell mediates the balance between vasoconstriction and relaxation via the major vasodilator endothelial derived nitric oxide (eNO). eNO is critical for vasorelaxation, increasing blood flow, and an important signaling molecule that downregulates the inflammatory cascade. A salient feature of diabetes, is endothelial dysfunction which is characterized by a reduction of the bioavailability of vasodilators, particularly nitric oxide (NO). Cellular derangements in diabetes are also related to dysregulation in Ca2+ handling with increased intracellular Ca2+overload, and oxidative stress. PSS increases eNO bioavailability, reduces inflammatory phenotype, decreases intracellular Ca2+ overload, and increases antioxidant capacity. This narrative review and perspective will outline four methods to non-invasively increase PSS; Exercise (the prototype for increasing PSS), Enhanced External Counterpulsation (EECP), Whole Body Vibration (WBV), Passive Simulated Jogging and its predicate device Whole Body Periodic Acceleration, and will discuss current knowledge on their use in diabetes.
Collapse
Affiliation(s)
- Jose A Adams
- Division of Neonatology, Mount Sinai Medical Center, Miami Beach, FL, United States
| | - Arkady Uryash
- Division of Neonatology, Mount Sinai Medical Center, Miami Beach, FL, United States
| | - Jose R Lopez
- Department of Research, Mount Sinai Medical Center, Miami Beach, FL, United States
| | - Marvin A Sackner
- Department of Medicine, Mount Sinai Medical Center, Miami Beach, FL, United States
| |
Collapse
|
6
|
Alme KN, Knapskog AB, Næss H, Naik M, Beyer M, Ellekjaer H, English C, Hansen HI, Kummeneje CS, Munthe-Kaas R, Saltvedt I, Seljeseth Y, Tan X, Thingstad P, Askim T. Is long-bout sedentary behaviour associated with long-term glucose levels 3 months after acute ischaemic stroke? A prospective observational cohort study. BMJ Open 2020; 10:e037475. [PMID: 33243789 PMCID: PMC7692836 DOI: 10.1136/bmjopen-2020-037475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND AND PURPOSE Sedentary behaviour is a risk factor for vascular disease and stroke patients are more sedentary than their age-matched peers. The association with glucose levels, as a potential mediator, is unclear, and we have investigated the association between long-bout sedentary behaviour and long-term glucose levels in stroke survivors. METHODS This study uses data from the Norwegian Cognitive Impairment After Stroke study, a multicentre cohort study. The patients were recruited at hospital admission for acute stroke, and the follow-up was done at the outpatient clinic. Sedentary behaviour-being in a sitting or reclining position-was registered 3 months after stroke using position transition data from the body-worn sensor activPAL attached to the unaffected thigh. A MATLAB script was developed to extract activity data from 08:00 to 10:00 for 4 days and to categorise the data into four bout-length categories. The primary outcome was glycated haemoglobin (HbA1c), analysed at 3 months. Regression models were used to analyse the association between HbA1c and sedentary behaviour in the whole population and stratified based on a diagnosis of diabetes mellitus (DM). Age, body mass index and the use of antidiabetic drugs were added as covariates into the models. RESULTS From a total of 815 included patients, 379 patients fulfilled the inclusion criteria for this study. We found no association between time in sedentary behaviour and HbA1c in the whole stroke population. We found time in sedentary behaviour in bouts of ≥90 min to be associated with a higher HbA1c in patients with DM. CONCLUSION Long-bout sedentary time is associated with a higher HbA1c in patients with DM 3 months after ischaemic stroke. Future research should investigate the benefit of breaking up sedentary time as a secondary preventive measure. TRIAL REGISTRATION NUMBER NCT02650531, https://clinicaltrials.gov/ct2/show/NCT02650531.
Collapse
Affiliation(s)
- Katinka Nordheim Alme
- Department of Clinical Medicine (K1), University of Bergen, Bergen, Norway
- Department of Internal Medicine, Haraldsplass Deaconess Hospital, Bergen, Norway
- Kavli Research Centre for Geriatrics and Dementia, Haraldsplass Deaconess Hospital, Bergen, Norway
| | - Anne-Brita Knapskog
- Department of Geriatric Medicine, Oslo University Hospital Ullevaal, Oslo, Norway
| | - Halvor Næss
- Department of Clinical Medicine (K1), University of Bergen, Bergen, Norway
- Department of Neurology, Haukeland University Hospital, Bergen, Norway
- Centre for Age-Related Medicine (SESAM), Stavanger University Hospital, Stavanger, Norway
| | - Mala Naik
- Department of Internal Medicine, Haraldsplass Deaconess Hospital, Bergen, Norway
- Department of Clinical Science (K2), University of Bergen, Bergen, Norway
| | - Mona Beyer
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Division of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway
| | - Hanne Ellekjaer
- Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
- Stroke Unit, Clinic of Internal Medicine, Saint Olavs Hospital University Hospital, Trondheim, Norway
| | - Coralie English
- Division of Health Sciences, International Centre for Allied health Evidence, University of South Australia Division of Health Sciences, Adelaide, South Australia, Australia
- Stroke Division, The Florey Institute of Neuroscience and Mental Health, Parkville, Victoria, Australia
| | - Hege Ihle Hansen
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Neurology, Oslo University Hospital, Oslo, Norway
| | - Camilla Sollesnes Kummeneje
- Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
| | - Ragnhild Munthe-Kaas
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Medicine, Vestre Viken Hospital Trust, Drammen, Norway
| | - Ingvild Saltvedt
- Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
- Department of Geriatrics, Clinic of Internal Medicine, Saint Olavs Hospital University Hospital, Trondheim, Norway
| | - Yngve Seljeseth
- Department of Internal Medicine, Aalesund Hospital, Alesund, Norway
| | - Xiangchung Tan
- Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
| | - Pernille Thingstad
- Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
| | - Torunn Askim
- Department of Neuromedicine and Movement Science, Norwegian University of Science and Technology, Trondheim, Norway
| |
Collapse
|
7
|
Duft RG, Castro A, Bonfante ILP, Lopes WA, da Silva LR, Chacon-Mikahil MPT, Leite N, Cavaglieri CR. Altered metabolomic profiling of overweight and obese adolescents after combined training is associated with reduced insulin resistance. Sci Rep 2020; 10:16880. [PMID: 33037261 PMCID: PMC7547065 DOI: 10.1038/s41598-020-73943-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 09/24/2020] [Indexed: 12/12/2022] Open
Abstract
Exercise training and a healthy diet are the main non-pharmacological strategies for treating chronic conditions, such as obesity and insulin resistance (IR), in adolescents. However, the isolated metabolic changes caused by exercise training without dietary intervention have not yet been established. We investigated how combined training (CT) without dietary intervention altered the concentrations of serum metabolites, biochemical, anthropometric and functional parameters in overweight and obese adolescents. Thirty-seven adolescents (14.6 ± 1.05 years), of both sexes, were randomly assigned to the control group (CG, n = 19) or the training group (TG, n = 18). The CT was composed by resistance training and aerobic training performed in the same session (~ 60 min), three times a week, for 12 weeks. All assessments were performed pre and post-intervention. Metabolomics analyses were conducted using nuclear magnetic resonance spectroscopy (1H NMR) in a 600 MHz spectrometer. There was a decrease in body weight (BW), body mass index (BMI), waist circumference (WC), % body fat (%BF), fasting glucose, insulin levels, and insulin resistance (IR), by HOMA-IR, in the TG. An increase in fat-free mass (FFM) was also observed in the CG. The metabolic changes were given mainly by changes in the levels of metabolites 2-oxoisocaproate (↓TG), 3-hydroxyisobutyrate (↑CG and ↓TG), glucose (↓TG), glutamine (↓CG and ↑TG) and pyruvate (↓TG). These findings demonstrate the positive effects of CT program without dietary intervention on metabolomic profile, body composition, biochemical markers, and glucose metabolism in overweight and obese adolescents.
Collapse
Affiliation(s)
- Renata G Duft
- Laboratory of Exercise Physiology, Faculty of Physical Education, University of Campinas (UNICAMP), Av. ÉricoVeríssimo, 701, Campinas, São Paulo, Brazil.
| | - Alex Castro
- Laboratory of Exercise Physiology, Faculty of Physical Education, University of Campinas (UNICAMP), Av. ÉricoVeríssimo, 701, Campinas, São Paulo, Brazil
| | - Ivan L P Bonfante
- Laboratory of Exercise Physiology, Faculty of Physical Education, University of Campinas (UNICAMP), Av. ÉricoVeríssimo, 701, Campinas, São Paulo, Brazil
| | - Wendell A Lopes
- Department of Physical Education, State University of Maringa, Maringa, Brazil
| | - Larissa R da Silva
- Department of Physical Education, University of Parana, Curitiba, Brazil
| | - Mara P T Chacon-Mikahil
- Laboratory of Exercise Physiology, Faculty of Physical Education, University of Campinas (UNICAMP), Av. ÉricoVeríssimo, 701, Campinas, São Paulo, Brazil
| | - Neiva Leite
- Department of Physical Education, University of Parana, Curitiba, Brazil
| | - Cláudia R Cavaglieri
- Laboratory of Exercise Physiology, Faculty of Physical Education, University of Campinas (UNICAMP), Av. ÉricoVeríssimo, 701, Campinas, São Paulo, Brazil.
| |
Collapse
|
8
|
Reddy R, Resalat N, Wilson LM, Castle JR, El Youssef J, Jacobs PG. Prediction of Hypoglycemia During Aerobic Exercise in Adults With Type 1 Diabetes. J Diabetes Sci Technol 2019; 13:919-927. [PMID: 30650997 PMCID: PMC6955453 DOI: 10.1177/1932296818823792] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Fear of exercise related hypoglycemia is a major reason why people with type 1 diabetes (T1D) do not exercise. There is no validated prediction algorithm that can predict hypoglycemia at the start of aerobic exercise. METHODS We have developed and evaluated two separate algorithms to predict hypoglycemia at the start of exercise. Model 1 is a decision tree and model 2 is a random forest model. Both models were trained using a meta-data set based on 154 observations of in-clinic aerobic exercise in 43 adults with T1D from 3 different studies that included participants using sensor augmented pump therapy, automated insulin delivery therapy, and automated insulin and glucagon therapy. Both models were validated using an entirely new validation data set with 90 exercise observations collected from 12 new adults with T1D. RESULTS Model 1 identified two critical features predictive of hypoglycemia during exercise: heart rate and glucose at the start of exercise. If heart rate was greater than 121 bpm during the first 5 min of exercise and glucose at the start of exercise was less than 182 mg/dL, it predicted hypoglycemia with 79.55% accuracy. Model 2 achieved a higher accuracy of 86.7% using additional features and higher complexity. CONCLUSIONS Models presented here can assist people with T1D to avoid exercise related hypoglycemia. The simple model 1 heuristic can be easily remembered (the 180/120 rule) and model 2 is more complex requiring computational resources, making it suitable for automated artificial pancreas or decision support systems.
Collapse
Affiliation(s)
- Ravi Reddy
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, USA
| | - Navid Resalat
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, USA
| | - Leah M. Wilson
- Department of Medicine, Division of Endocrinology, Harold Schnitzer Diabetes Health Center Oregon, Health & Science University, Portland, OR, USA
| | - Jessica R. Castle
- Department of Medicine, Division of Endocrinology, Harold Schnitzer Diabetes Health Center Oregon, Health & Science University, Portland, OR, USA
| | - Joseph El Youssef
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, USA
- Department of Medicine, Division of Endocrinology, Harold Schnitzer Diabetes Health Center Oregon, Health & Science University, Portland, OR, USA
| | - Peter G. Jacobs
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, USA
- Peter G. Jacobs, PhD, Department of Biomedical Engineering, Oregon Health & Science University, 3303 SW Bond Ave, Mailstop: 13B, Portland, OR 97239, USA.
| |
Collapse
|
9
|
Taheri N, Mohammadi HK, Ardakani GJ, Heshmatipour M. The effects of passive stretching on the blood glucose levels of patients with type 2 diabetes. J Bodyw Mov Ther 2019; 23:394-398. [PMID: 31103126 DOI: 10.1016/j.jbmt.2018.02.009] [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] [Received: 09/14/2017] [Revised: 01/28/2018] [Accepted: 02/04/2018] [Indexed: 10/18/2022]
Abstract
BACKGROUND Type 2 diabetes is characterized by poor glycemic control due to decreased insulin sensitivity. Physical activity plays an important role in the management of diabetes and reduces blood glucose level. The aim of this study was to evaluate the effectiveness of passive stretching (PS) on the blood glucose level (BGL) of diabetic patients. MATERIALS AND METHODS In this randomized clinical trial, fifty patients with type 2 diabetes and mean age of 50.7 ± 4.8 years were randomly and equally allocated into control and intervention groups. Patients in the intervention and control groups underwent 20 min of passive stretching (PS) and passive movement (PM), respectively. BGL was measured before and immediately after, 20 min after and 1 h after PS/PM in the two study groups. BGL at the mentioned times was compared between and within the groups. RESULTS The findings showed that when compared with before the PS (195.7 ± 30.1), BGL significantly reduced (p < 0.001) immediately after (178.9 ± 29.7), 20 min after (183.2 ± 29.1), and 1 h after (187.8 ± 29.6) the PS. However, BGL after PM (immediately, 20 min and 1 h after PM) did not significantly change (p > 0.05). CONCLUSION The findings of this study indicated that PS has a significant effect on the reduction of the immediate BGL in type 2 diabetic patients. The trend reduced even though the effect remained for 1 h after PS. It is therefore suggested that the effectiveness of these types of activities should be evaluated over a longer duration of study.
Collapse
Affiliation(s)
- Navid Taheri
- Department of Physical Therapy, Faculty of Rehabilitation Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hosein Kouhzad Mohammadi
- Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Gholamreza Jafarian Ardakani
- Department of Physical Therapy, Faculty of Rehabilitation Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mojtaba Heshmatipour
- Department of Physical Therapy, Faculty of Rehabilitation Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| |
Collapse
|
10
|
Li J, Polston KFL, Eraslan M, Bickel CS, Windham ST, McLain AB, Oster RA, Bamman MM, Yarar‐Fisher C. A high-protein diet or combination exercise training to improve metabolic health in individuals with long-standing spinal cord injury: a pilot randomized study. Physiol Rep 2018; 6:e13813. [PMID: 30156033 PMCID: PMC6113133 DOI: 10.14814/phy2.13813] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 07/02/2018] [Indexed: 11/24/2022] Open
Abstract
We compared the effects of an 8-week iso-caloric high-protein (HP) diet versus a combined exercise regimen (Comb-Ex) in individuals with long-standing spinal cord injury (SCI). Effects on metabolic profiles, markers of inflammation, and signaling proteins associated with glucose transporter 4 (GLUT-4) translocation in muscles were evaluated. Eleven participants with SCI completed the study (HP diet: n = 5; Comb-Ex: n = 6; 46 ± 8 years; C5-T12 levels; American Spinal Injury Association Impairment Scale A or B). The Comb-Ex regimen included upper body resistance training (RT) and neuromuscular electrical stimulation-induced-RT for paralytic quadriceps muscles, interspersed with high-intensity (80-90% VO2 peak) arm cranking exercises 3 days/week. The HP diet included ~30% total energy as protein (carbohydrate to protein ratio <1.5, ~30% energy from fat). Oral glucose tolerance tests and muscle biopsies of the vastus lateralis (VL) and deltoid muscles were performed before and after the trial. Fasting plasma glucose levels decreased in the Comb-Ex (P < 0.05) group compared to the HP-diet group. A decrease in areas under the curve for insulin and TNF-α concentrations was observed for all participants regardless of group assignment (time effect, P < 0.05). Although both groups exhibited a quantitative increase in insulin sensitivity as measured by the Matsuda Index, the change was clinically meaningful only in the HP diet group (HP diet: pre, 4.6; post, 11.6 vs. Comb-Ex: pre, 3.3; post, 4.6). No changes were observed in proteins associated with GLUT-4 translocation in VL or deltoid muscles. Our results suggest that the HP-diet and Comb-Ex regimen may improve insulin sensitivity and decrease TNF-α concentrations in individuals with SCI.
Collapse
Affiliation(s)
- Jia Li
- Physical Medicine and RehabilitationUniversity of Alabama at BirminghamBirminghamAlabama
| | - Keith F. L. Polston
- University of Tennessee Health Science Center College of MedicineMemphisTennessee
| | - Mualla Eraslan
- Physical Medicine and RehabilitationUniversity of Alabama at BirminghamBirminghamAlabama
| | - C. Scott Bickel
- Physical Therapy and RehabilitationSamford UniversityBirminghamAlabama
| | - Samuel T. Windham
- Department of SurgeryUniversity of Alabama at BirminghamBirminghamAlabama
- UAB Center for Exercise MedicineUniversity of Alabama at BirminghamBirminghamAlabama
| | - Amie B. McLain
- Physical Medicine and RehabilitationUniversity of Alabama at BirminghamBirminghamAlabama
- UAB Center for Exercise MedicineUniversity of Alabama at BirminghamBirminghamAlabama
| | - Robert A. Oster
- Division of Preventive MedicineDepartment of MedicineUniversity of Alabama at BirminghamBirminghamAlabama
| | - Marcas M. Bamman
- UAB Center for Exercise MedicineUniversity of Alabama at BirminghamBirminghamAlabama
- Department of Cell, Developmental, and Integrative BiologyUniversity of Alabama at BirminghamBirminghamAlabama
- Geriatric Research, Education, and Clinical CenterBirmingham VA Medical CenterBirminghamAlabama
| | - Ceren Yarar‐Fisher
- Physical Medicine and RehabilitationUniversity of Alabama at BirminghamBirminghamAlabama
- UAB Center for Exercise MedicineUniversity of Alabama at BirminghamBirminghamAlabama
| |
Collapse
|
11
|
DeBoer MD, Cherñavvsky DR, Topchyan K, Kovatchev BP, Francis GL, Breton MD. Heart rate informed artificial pancreas system enhances glycemic control during exercise in adolescents with T1D. Pediatr Diabetes 2017; 18:540-546. [PMID: 27734563 DOI: 10.1111/pedi.12454] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 09/02/2016] [Accepted: 09/02/2016] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE To evaluate the safety and performance of using a heart rate (HR) monitor to inform an artificial pancreas (AP) system during exercise among adolescents with type 1 diabetes (T1D). MATERIALS AND METHODS In a randomized, cross-over trial, adolescents with T1D age 13 - 18 years were enrolled to receive on separate days either the unmodified UVa AP (stdAP) or an AP system connected to a portable HR monitor (AP-HR) that triggered an exercise algorithm for blood glucose (BG) control. During admissions participants underwent a structured exercise regimen. Hypoglycemic events and CGM tracings were compared between the two admissions, during exercise and for the full 24-hour period. RESULTS Eighteen participants completed the trial. While number of hypoglycemic events during exercise and rest was not different between visits (0.39 AP-HR vs 0.50 stdAP), time below 70 mg dL -1 was lower on AP-HR compared to stdAP, 0.5±2.1% vs 7.4±12.5% (P = 0.028). Time with BG within 70-180 mg dL -1 was higher for the AP-HR admission vs stdAP during the exercise portion and overall (96% vs 87%, and 77% vs 74%), but these did not reach statistical significance (P = 0.075 and P = 0.366). CONCLUSIONS Heart rate signals can safely and efficaciously be integrated in a wireless AP system to inform of physical activity. While exercise contributes to hypoglycemia among adolescents, even when using an AP system, informing the system of exercise via a HR monitor improved time <70 mg dL -1 . Nonetheless, it did not significantly reduce the total number of hypoglycemic events, which were low in both groups.
Collapse
Affiliation(s)
- Mark D DeBoer
- Center for Diabetes Technology, University of Virginia, Charlottesville, Virginia.,Division of Pediatric Endocrinology, Department of Pediatrics, University of Virginia, Charlottesville, Virginia
| | - Daniel R Cherñavvsky
- Center for Diabetes Technology, University of Virginia, Charlottesville, Virginia
| | - Katarina Topchyan
- Division of Endocrinology, Department of Medicine, University of Virginia, Charlottesville, Virginia
| | - Boris P Kovatchev
- Center for Diabetes Technology, University of Virginia, Charlottesville, Virginia
| | - Gary L Francis
- Division of Endocrinology, Department of Medicine, University of Virginia, Charlottesville, Virginia
| | - Marc D Breton
- Center for Diabetes Technology, University of Virginia, Charlottesville, Virginia.,Division of Pediatric Endocrinology, Department of Pediatrics, Virginia Commonwealth University, Richmond, Virginia
| |
Collapse
|
12
|
Sah SP, Singh B, Choudhary S, Kumar A. Animal models of insulin resistance: A review. Pharmacol Rep 2016; 68:1165-1177. [PMID: 27639595 DOI: 10.1016/j.pharep.2016.07.010] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 07/26/2016] [Accepted: 07/28/2016] [Indexed: 12/22/2022]
Abstract
Insulin resistance can be seen as a molecular and genetic mystery, with a role in the pathophysiology of type 2 diabetes mellitus. It is a basis for a number of chronic diseases like hypertension, dyslipidemia, glucose intolerance, coronary heart disease, cerebral vascular disease along with T2DM, thus the key is to cure and prevent insulin resistance. Critical perspicacity into the etiology of insulin resistance have been gained by the use of animal models where insulin action has been modulated by various transgenic and non-transgenic models which is not possible in human studies. The following review comprises the pathophysiology involved in insulin resistance, various factors causing insulin resistance, their screening and various genetic and non-genetic animal models highlighting the pathological and metabolic characteristics of each.
Collapse
Affiliation(s)
- Sangeeta Pilkhwal Sah
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, 160014, India.
| | - Barinder Singh
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, 160014, India
| | - Supriti Choudhary
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, 160014, India
| | - Anil Kumar
- Pharmacology Division, University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, 160014, India
| |
Collapse
|
13
|
Choi SI, Lee HA, Han JS. Gynura procumbens extract improves insulin sensitivity and suppresses hepatic gluconeogenesis in C57BL/KsJ- db/db mice. Nutr Res Pract 2016; 10:507-515. [PMID: 27698958 PMCID: PMC5037068 DOI: 10.4162/nrp.2016.10.5.507] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 03/29/2016] [Accepted: 05/10/2016] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND/OBJECTIVES This study was designed to investigate whether Gynura procumbens extract (GPE) can improve insulin sensitivity and suppress hepatic glucose production in an animal model of type 2 diabetes. MATERIALS/METHODS C57BL/Ksj-db/db mice were divided into 3 groups, a regular diet (control), GPE, and rosiglitazone groups (0.005 g/100 g diet) and fed for 6 weeks. RESULTS Mice supplemented with GPE showed significantly lower blood levels of glucose and glycosylated hemoglobin than diabetic control mice. Glucose and insulin tolerance test also showed the positive effect of GPE on increasing insulin sensitivity. The homeostatic index of insulin resistance was significantly lower in mice supplemented with GPE than in the diabetic control mice. In the skeletal muscle, the expression of phosphorylated AMP-activated protein kinase, pAkt substrate of 160 kDa, and PM-glucose transporter type 4 increased in mice supplemented with GPE when compared to that of the diabetic control mice. GPE also decreased the expression of glucose-6-phosphatase and phosphoenolpyruvate carboxykinase in the liver. CONCLUSIONS These findings demonstrate that GPE might improve insulin sensitivity and inhibit gluconeogenesis in the liver.
Collapse
Affiliation(s)
- Sung-In Choi
- Department of Food Science and Nutrition, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, Busan 46241, Korea
| | - Hyun-Ah Lee
- Department of Food Science and Nutrition, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, Busan 46241, Korea
| | - Ji-Sook Han
- Department of Food Science and Nutrition, Pusan National University, Jangjeon 2-dong, Geumjeong-gu, Busan 46241, Korea.; Research Institute of Ecology for the Elderly, Pusan National University, Busan 46241, Korea
| |
Collapse
|
14
|
[Prevention of cardiovascular diseases through sport and physical activity: A question of intensity?]. Herz 2016; 40:361-8. [PMID: 25804555 DOI: 10.1007/s00059-015-4216-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Coronary artery disease is the leading cause of death worldwide. A sedentary lifestyle accounts for 9% of premature mortality and creates a substantial health economic burden. Measurement of physical activity in daily practice refers to metabolic equivalent tasks and assessment of cardiopulmonary fitness to measurements of peak oxygen uptake during ergometry, which can be used to classify an individual's physical activity and maximum exercise capacity. Physical activity is a multifunctional intervention tool in prevention, which exerts its effects on multiple biochemical pathways, in contrast to conventional drug therapy. These changes reduce cardiovascular morbidity and mortality. Moderate physical exercise reduces blood pressure, improves insulin sensitivity and dyslipidemia, improves body composition and enhances weight reduction. Exercise of higher intensity seems to have superior effects compared to moderate intensity training; however, the training volume also seems to be important, as negative effects of long-term intensive training have been reported, e.g. atrial fibrillation or coronary sclerosis. Overall, exercise training has a major role in primary prevention of cardiovascular disease but seems to have a maximum threshold for benefit, which may be exceeded by some individuals.
Collapse
|
15
|
Park SH. Effects of passive static stretching on blood glucose levels in patients with type 2 diabetes mellitus. J Phys Ther Sci 2015; 27:1463-5. [PMID: 26157241 PMCID: PMC4483419 DOI: 10.1589/jpts.27.1463] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 01/17/2015] [Indexed: 11/24/2022] Open
Abstract
[Purpose] This study determined the effects of passive static stretching on blood glucose
levels in patients with type 2 diabetes. [Subjects] Fifteen patients (8 males and 7
females) with type 2 diabetes were recruited and randomly assigned to the control group or
passive static stretching group. [Methods] Glycated hemoglobin was measured before and
after the 8-week training period. [Results] Glycated hemoglobin levels decreased
significantly in the passive static stretching group, and there were significant
differences in blood glucose levels between the 2 groups. [Conclusion] Passive static
stretching of the skeletal muscles may be an alternative to exercise to help regulate
blood glucose levels in diabetes patients.
Collapse
Affiliation(s)
- Seong Hoon Park
- Department of Physical Therapy, College of Rehabilitation Science, Daegu University, Republic of Korea
| |
Collapse
|
16
|
Breton MD, Brown SA, Karvetski CH, Kollar L, Topchyan KA, Anderson SM, Kovatchev BP. Adding heart rate signal to a control-to-range artificial pancreas system improves the protection against hypoglycemia during exercise in type 1 diabetes. Diabetes Technol Ther 2014; 16:506-11. [PMID: 24702135 PMCID: PMC4116126 DOI: 10.1089/dia.2013.0333] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND We present a clinical trial establishing the feasibility of a control-to-range (CTR) closed-loop system informed by heart rate (HR) and assess the effect of HR information added to CTR on the risk for hypoglycemia during and after exercise. SUBJECTS AND METHODS Twelve subjects with type 1 diabetes (five men, seven women; weight, 68.9 ± 3.1 kg; age, 38 ± 3.3 years; glycated hemoglobin, 6.9 ± 0.2%) participated in a randomized crossover clinical trial comparing CTR versus CTR+HR in two 26-h admissions, each including 30 min of mild exercise. The CTR algorithm was implemented in the DiAs portable artificial pancreas platform based on an Android(®) (Google, Mountainview, CA) smartphone. We assessed blood glucose (BG) decline during exercise, the Low BG Index (LBGI) (a measure of hypoglycemic risk), number of hypoglycemic episodes (BG <70 mg/dL) and overall glucose control (percentage time within the target range 70 mg/dL ≤ BG ≤ 180 mg/dL). RESULTS Using HR to inform the CTR algorithm reduced significantly the BG decline during exercise (P=0.022), indicated marginally lower LBGI (P=0.3) and fewer hypoglycemic events during exercise (none vs. two events; P=0.16), and resulted in overall higher percentage time within the target range (81% vs. 75%; P=0.2). LBGI and average BG remained unchanged overall, during recovery, and overnight. CONCLUSIONS HR-informed closed-loop control can be implemented in a portable artificial pancreas. Although closed loop has been shown to reduce hypoglycemia, adding HR signal may further limit the risk for hypoglycemia during and immediately after exercise. The most prominent effect of adding HR information is reduced BG decline during exercise, without deterioration of overall glycemic control.
Collapse
Affiliation(s)
- Marc D Breton
- Center for Diabetes Technology, University of Virginia , Charlottesville, Virginia
| | | | | | | | | | | | | |
Collapse
|
17
|
Yada K, Matoba H. Vitamin C supplementation does not alter high-intensity endurance training-induced mitochondrial biogenesis in rat epitrochlearis muscle. J Physiol Sci 2014; 64:113-8. [PMID: 24371033 PMCID: PMC10717740 DOI: 10.1007/s12576-013-0300-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 12/05/2013] [Indexed: 02/02/2023]
Abstract
The purpose of this study was to investigate whether vitamin C supplementation prevents high-intensity intermittent endurance training-induced mitochondrial biogenesis in the skeletal muscle. Male Wistar-strain rats were assigned to one of five groups: a control group, training group, small dose vitamin C supplemented training group, middle dose vitamin C supplemented training group, and large dose vitamin C supplemented training group. The rats of the trained groups were subjected to intense intermittent swimming training. The vitamin C supplemented groups were administrated vitamin C for the pretraining and training periods. High-intensity intermittent swimming training without vitamin C supplementation significantly increased peroxisome proliferator-activated receptor-γ coactivator-1α protein content and citrate synthase activity in the epitrochlearis muscle. The vitamin C supplementation did not alter the training-induced increase of these regardless of the dose of vitamin C supplementation. The results demonstrate that vitamin C supplementation does not prevent high-intensity intermittent training-induced mitochondrial biogenesis in the skeletal muscle.
Collapse
Affiliation(s)
- Koichi Yada
- Laboratory of Exercise Physiology, Integrated Arts and Sciences, The University of Tokushima Graduate School, 1-1 Minamijosanjima-cho, Tokushima, 770-8502, Japan,
| | | |
Collapse
|
18
|
Zecchin C, Facchinetti A, Sparacino G, Dalla Man C, Manohar C, Levine JA, Basu A, Kudva YC, Cobelli C. Physical activity measured by physical activity monitoring system correlates with glucose trends reconstructed from continuous glucose monitoring. Diabetes Technol Ther 2013; 15:836-44. [PMID: 23944973 PMCID: PMC3781118 DOI: 10.1089/dia.2013.0105] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND In type 1 diabetes mellitus (T1DM), physical activity (PA) lowers the risk of cardiovascular complications but hinders the achievement of optimal glycemic control, transiently boosting insulin action and increasing hypoglycemia risk. Quantitative investigation of relationships between PA-related signals and glucose dynamics, tracked using, for example, continuous glucose monitoring (CGM) sensors, have been barely explored. SUBJECTS AND METHODS In the clinic, 20 control and 19 T1DM subjects were studied for 4 consecutive days. They underwent low-intensity PA sessions daily. PA was tracked by the PA monitoring system (PAMS), a system comprising accelerometers and inclinometers. Variations on glucose dynamics were tracked estimating first- and second-order time derivatives of glucose concentration from CGM via Bayesian smoothing. Short-time effects of PA on glucose dynamics were quantified through the partial correlation function in the interval (0, 60 min) after starting PA. RESULTS Correlation of PA with glucose time derivatives is evident. In T1DM, the negative correlation with the first-order glucose time derivative is maximal (absolute value) after 15 min of PA, whereas the positive correlation is maximal after 40-45 min. The negative correlation between the second-order time derivative and PA is maximal after 5 min, whereas the positive correlation is maximal after 35-40 min. Control subjects provided similar results but with positive and negative correlation peaks anticipated of 5 min. CONCLUSIONS Quantitative information on correlation between mild PA and short-term glucose dynamics was obtained. This represents a preliminary important step toward incorporation of PA information in more realistic physiological models of the glucose-insulin system usable in T1DM simulators, in development of closed-loop artificial pancreas control algorithms, and in CGM-based prediction algorithms for generation of hypoglycemic alerts.
Collapse
Affiliation(s)
- Chiara Zecchin
- Department of Information Engineering, University of Padova, Padova, Italy
| | - Andrea Facchinetti
- Department of Information Engineering, University of Padova, Padova, Italy
| | - Giovanni Sparacino
- Department of Information Engineering, University of Padova, Padova, Italy
| | - Chiara Dalla Man
- Department of Information Engineering, University of Padova, Padova, Italy
| | - Chinmay Manohar
- Department of Internal Medicine, Division of Endocrinology and Metabolism, Mayo Clinic, Rochester, Minnesota
| | - James A. Levine
- Department of Internal Medicine, Division of Endocrinology and Metabolism, Mayo Clinic, Rochester, Minnesota
| | - Ananda Basu
- Department of Internal Medicine, Division of Endocrinology and Metabolism, Mayo Clinic, Rochester, Minnesota
| | - Yogish C. Kudva
- Department of Internal Medicine, Division of Endocrinology and Metabolism, Mayo Clinic, Rochester, Minnesota
| | - Claudio Cobelli
- Department of Information Engineering, University of Padova, Padova, Italy
| |
Collapse
|
19
|
Hocking S, Samocha-Bonet D, Milner KL, Greenfield JR, Chisholm DJ. Adiposity and insulin resistance in humans: the role of the different tissue and cellular lipid depots. Endocr Rev 2013; 34:463-500. [PMID: 23550081 DOI: 10.1210/er.2012-1041] [Citation(s) in RCA: 179] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Human adiposity has long been associated with insulin resistance and increased cardiovascular risk, and abdominal adiposity is considered particularly adverse. Intra-abdominal fat is associated with insulin resistance, possibly mediated by greater lipolytic activity, lower adiponectin levels, resistance to leptin, and increased inflammatory cytokines, although the latter contribution is less clear. Liver lipid is also closely associated with, and likely to be an important contributor to, insulin resistance, but it may also be in part the consequence of the lipogenic pathway of insulin action being up-regulated by hyperinsulinemia and unimpaired signaling. Again, intramyocellular triglyceride is associated with muscle insulin resistance, but anomalies include higher intramyocellular triglyceride in insulin-sensitive athletes and women (vs men). Such issues could be explained if the "culprits" were active lipid moieties such as diacylglycerol and ceramide species, dependent more on lipid metabolism and partitioning than triglyceride amount. Subcutaneous fat, especially gluteofemoral, appears metabolically protective, illustrated by insulin resistance and dyslipidemia in patients with lipodystrophy. However, some studies suggest that deep sc abdominal fat may have adverse properties. Pericardial and perivascular fat relate to atheromatous disease, but not clearly to insulin resistance. There has been recent interest in recognizable brown adipose tissue in adult humans and its possible augmentation by a hormone, irisin, from exercising muscle. Brown adipose tissue is metabolically active, oxidizes fatty acids, and generates heat but, because of its small and variable quantities, its metabolic importance in humans under usual living conditions is still unclear. Further understanding of specific roles of different lipid depots may help new approaches to control obesity and its metabolic sequelae.
Collapse
Affiliation(s)
- Samantha Hocking
- Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst NSW 2010, Sydney, Australia.
| | | | | | | | | |
Collapse
|
20
|
Allen RE, Hughes TD, Ng JL, Ortiz RD, Ghantous MA, Bouhali O, Froguel P, Arredouani A. Mechanisms behind the immediate effects of Roux-en-Y gastric bypass surgery on type 2 diabetes. Theor Biol Med Model 2013; 10:45. [PMID: 23849268 PMCID: PMC3726422 DOI: 10.1186/1742-4682-10-45] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 07/10/2013] [Indexed: 02/08/2023] Open
Abstract
Background The most common bariatric surgery, Roux-en-Y gastric bypass, leads to glycemia normalization in most patients long before there is any appreciable weight loss. This effect is too large to be attributed purely to caloric restriction, so a number of other mechanisms have been proposed. The most popular hypothesis is enhanced production of an incretin, active glucagon-like peptide-1 (GLP-1), in the lower intestine. We therefore set out to test this hypothesis with a model which is simple enough to be robust and credible. Method Our method involves (1) setting up a set of time-dependent equations for the concentrations of the most relevant species, (2) considering an “adiabatic” (or quasi-equilibrium) state in which the concentrations are slowly varying compared to reaction rates (and which in the present case is a postprandial state), and (3) solving for the dependent concentrations (of e.g. insulin and glucose) as an independent concentration (of e.g. GLP-1) is varied. Results Even in the most favorable scenario, with maximal values for (i) the increase in active GLP-1 concentration and (ii) the effect of GLP-1 on insulin production, enhancement of GLP-1 alone cannot account for the observations. I.e., the largest possible decrease in glucose predicted by the model is smaller than reported decreases, and the model predicts no decrease whatsoever in glucose ×insulin, in contrast to large observed decreases in homeostatic model assessment insulin resistance (HOMA-IR). On the other hand, both effects can be accounted for if the surgery leads to a substantial increase in some substance that opens an alternative insulin-independent pathway for glucose transport into muscle cells, which perhaps uses the same intracellular pool of GLUT-4 that is employed in an established insulin-independent pathway stimulated by muscle contraction during exercise. Conclusions Glycemia normalization following Roux-en-Y gastric bypass is undoubtedly caused by a variety of mechanisms, which may include caloric restriction, enhanced GLP-1, and perhaps others proposed in earlier papers on this subject. However, the present results suggest that another possible mechanism should be added to the list of candidates: enhanced production in the lower intestine of a substance which opens an alternative insulin-independent pathway for glucose transport.
Collapse
Affiliation(s)
- Roland E Allen
- Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA.
| | | | | | | | | | | | | | | |
Collapse
|
21
|
Ji ES, Ko IG, Cho JW, Davis RW, Hwang GY, Jee YS, Lim BV. Treadmill exercise inhibits apoptotic neuronal cell death with suppressed vascular endothelial growth factor expression in the retinas of the diabetic rats. J Exerc Rehabil 2013; 9:348-53. [PMID: 24278883 PMCID: PMC3836530 DOI: 10.12965/jer.130043] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 06/14/2013] [Accepted: 06/23/2013] [Indexed: 11/22/2022] Open
Abstract
Diabetic retinopathy is one of the most important microvascular complications in diabetes, and it is the major cause of visual loss. Physical exercise is known to ameliorate the symptoms of metabolic syndromes such as diabetic mellitus. In the present study, we investigated the effects of treadmill exercise on vascular endothelial growth factor (VEGF) expression and apoptotic cell death in the retinas of streptozotocin (STZ)-induced diabetic rats. The male Sprague-Dawley rats were randomly divided into three groups (n = 10 in each group): control group, STZ-induce diabetes group, STZ-induced diabetes and treadmill exercise group. To induce diabetes in the experimental animals, a single intraperitioneal injection of STZ (50 mg/kg) was given to each animal. The rats in the exercise group were forced to run on a motorized treadmill for 30 min once a day during 1 week starting 6 weeks after STZ injection. In the present results, VEGF expression in the retinas was increased by induction of diabetes. The numbers of caspase-3-positive and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL)-positive cells in the retinas were also enhanced by induction of diabetes. Treadmill exercise significantly decreased VEGF expression and suppressed the number of TUNEL-positive and caspase-3-positive cells in the retinas of diabetic rats. In the present study, we have shown that treadmill exercise might alleviate the progression of diabetic retinopathy through suppressing VEGF expression and apoptotic cell death in the retinas of the diabetic rats.
Collapse
Affiliation(s)
- Eun-Sang Ji
- Department of Sport & Health Science, College of Natural Science, Sangmyung University, Seoul, Korea
| | | | | | | | | | | | | |
Collapse
|
22
|
Nelson AG, Kokkonen J, Arnall DA. Twenty minutes of passive stretching lowers glucose levels in an at-risk population: an experimental study. J Physiother 2013; 57:173-8. [PMID: 21843832 DOI: 10.1016/s1836-9553(11)70038-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
QUESTION Can passive static stretching lower blood glucose in an at-risk population? DESIGN Randomised, within-participant experimental study. PARTICIPANTS 22 adults (17 males) either at increased risk of Type 2 diabetes or with Type 2 diabetes. INTERVENTION The participants reported to the laboratory 2hr after eating a meal, and drank 355ml of fruit juice (∼43g carbohydrate). Thirty minutes later, they underwent either a 40min passive static stretching regimen or a mock passive stretching regimen. Stretching consisted of six lower body and four upper body static passive stretches. For the mock stretches, the same positions were adopted, but no tension was applied to the musculature. OUTCOME MEASURES Blood glucose levels for both the stretching and mock stretching were analysed from a finger prick sample using a hand-held glucometer. Values were obtained at baseline (0min), during the regimen (20min), and after the regimen (40min) on both study days. RESULTS Compared to mock stretch, stretching resulted in a significantly greater drop in blood glucose at 20min (mean difference 28mg/dL, 95% CI 13 to 43; or 1.57mmol/L, 95% CI 0.72 to 2.39). This effect was also statistically significant at 40min (mean difference 24mg/dL, 95% CI 9 to 39; or 1.35mmol/L, 95% CI 0.50 to 2.17). CONCLUSION These results suggest that passive static stretching of the skeletal muscles may be an alternative to exercise to help lower blood glucose levels.
Collapse
|
23
|
Gould DW, Lahart I, Carmichael AR, Koutedakis Y, Metsios GS. Cancer cachexia prevention via physical exercise: molecular mechanisms. J Cachexia Sarcopenia Muscle 2013; 4:111-24. [PMID: 23239116 PMCID: PMC3684702 DOI: 10.1007/s13539-012-0096-0] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 11/14/2012] [Indexed: 01/09/2023] Open
Abstract
Cancer cachexia is a debilitating consequence of disease progression, characterised by the significant weight loss through the catabolism of both skeletal muscle and adipose tissue, leading to a reduced mobility and muscle function, fatigue, impaired quality of life and ultimately death occurring with 25-30 % total body weight loss. Degradation of proteins and decreased protein synthesis contributes to catabolism of skeletal muscle, while the loss of adipose tissue results mainly from enhanced lipolysis. These mechanisms appear to be at least, in part, mediated by systemic inflammation. Exercise, by virtue of its anti-inflammatory effect, is shown to be effective at counteracting the muscle catabolism by increasing protein synthesis and reducing protein degradation, thus successfully improving muscle strength, physical function and quality of life in patients with non-cancer-related cachexia. Therefore, by implementing appropriate exercise interventions upon diagnosis and at various stages of treatment, it may be possible to reverse protein degradation, while increasing protein synthesis and lean body mass, thus counteracting the wasting seen in cachexia.
Collapse
Affiliation(s)
- Douglas W Gould
- School of Sport, Performing Arts and Leisure, Department of Physical Activity, Exercise and Health, University of Wolverhampton, Walsall, West Midlands, UK,
| | | | | | | | | |
Collapse
|
24
|
Russell RD, Kraemer RR, Nelson AG. Metabolic dysfunction in diabetic offspring: deviations in metabolic flexibility. Med Sci Sports Exerc 2013; 45:8-15. [PMID: 22811035 DOI: 10.1249/mss.0b013e31826909d3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UNLABELLED In type 2 diabetes (T2D), insulin resistance is related to comorbidities, including high lipotoxicity, poor glucoregulation, and loss of metabolic flexibility. Controversy exists regarding whether reduced metabolic flexibility precedes insulin resistance or vice versa. PURPOSE The purpose of this study was to determine whether a family history of T2D leads to metabolic inflexibility. METHODS To examine potential loss of metabolic flexibility at early stages, we used a hooded metabolic cart to compare metabolic characteristics in people with T2D, family history of T2D (FH+), and controls (FH-) 1) at rest, 2) with passive stretching (PS) and recovery, and 3) with oral glucose load. Testing of 9 T2D, 11 FH+, and 9 FH- occurred after a 12-h fast under resting conditions. Expired gas and blood glucose (BG) were measured before and after each condition. RESULTS PS lowered BG (P < 0.05) in FH- and FH+ (mean ± SD, -2.7 ± 5.9 and -5.8 ± 7.5 mg·mL(-1)) compared with T2D (-0.9 ± 7.7). CHO use (kcal·min(-1)) increased with PS in all groups (0.04 ± 0.18, 0.03 ± 0.26, and 0.22 ± 1.6 mg·mL(-1) in FH-, FH+, and T2D, respectively). For oral glucose load, different metabolic flexibility existed between FH- as well as FH+ (0.16 ± 0.07) as well as T2D (0.16 ± 0.07), with no difference between FH- and T2D. CONCLUSION PS increases glycolytic activity without affecting BG in T2D, and reductions in metabolic flexibility exist in T2D and FH+ without glucoregulatory impairment in FH+, indicating early stage of mitochondrial dysfunction in FH+. Findings indicate PS is an important tool for assessing metabolic flexibility.
Collapse
Affiliation(s)
- Ryan D Russell
- Department of Kinesiology, Louisiana State University, Baton Rouge, LA, USA.
| | | | | |
Collapse
|
25
|
Golbidi S, Laher I. Potential mechanisms of exercise in gestational diabetes. J Nutr Metab 2013; 2013:285948. [PMID: 23691290 PMCID: PMC3649306 DOI: 10.1155/2013/285948] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 01/31/2013] [Accepted: 02/10/2013] [Indexed: 02/07/2023] Open
Abstract
Gestational diabetes mellitus (GDM) is defined as glucose intolerance first diagnosed during pregnancy. This condition shares same array of underlying abnormalities as occurs in diabetes outside of pregnancy, for example, genetic and environmental causes. However, the role of a sedentary lifestyle and/or excess energy intake is more prominent in GDM. Physically active women are less likely to develop GDM and other pregnancy-related diseases. Weight gain in pregnancy causes increased release of adipokines from adipose tissue; many adipokines increase oxidative stress and insulin resistance. Increased intramyocellular lipids also increase cellular oxidative stress with subsequent generation of reactive oxygen species. A well-planned program of exercise is an important component of a healthy lifestyle and, in spite of old myths, is also recommended during pregnancy. This paper briefly reviews the role of adipokines in gestational diabetes and attempts to shed some light on the mechanisms by which exercise can be beneficial as an adjuvant therapy in GDM. In this regard, we discuss the mechanisms by which exercise increases insulin sensitivity, changes adipokine profile levels, and boosts antioxidant mechanisms.
Collapse
Affiliation(s)
- Saeid Golbidi
- Department of Pharmacology and Therapeutics, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada V6T 1Z3
| | | |
Collapse
|
26
|
Regional differences in blood flow, glucose uptake and fatty acid uptake within quadriceps femoris muscle during dynamic knee-extension exercise. Eur J Appl Physiol 2013; 113:1775-82. [DOI: 10.1007/s00421-013-2609-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Accepted: 02/06/2013] [Indexed: 11/27/2022]
|
27
|
Morato PN, Lollo PCB, Moura CS, Batista TM, Carneiro EM, Amaya-Farfan J. A dipeptide and an amino acid present in whey protein hydrolysate increase translocation of GLUT-4 to the plasma membrane in Wistar rats. Food Chem 2013; 139:853-9. [PMID: 23561181 DOI: 10.1016/j.foodchem.2012.12.062] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/10/2012] [Accepted: 12/20/2012] [Indexed: 11/15/2022]
Abstract
Whey protein hydrolysate (WPH) is capable of increasing muscle glycogen reserves and of concentrating the glucose transporter in the plasma membrane (PM). The objective of this study was to determine which WPH components could modulate translocation of the glucose transporter GLUT-4 to the PM of animal skeletal muscle. Forty-nine animals were divided into 7 groups (n=7) and received by oral gavage 30% glucose plus 0.55 g/kg body mass of the following WPH components: (a) control; (b) WPH; (c) L-isoleucine; (d) L-leucine; (e) L-leucine plus L-isoleucine; (f) L-isoleucyl-L-leucine dipeptide; (g) L-leucyl-L-isoleucine dipeptide. After receiving these solutions, the animals were sacrificed and the GLUT-4 analysed by western blot. Additionally, glycogen, glycaemia, insulin and free amino acids were also determined by standard methods. Of the WPH components tested, the amino acid L-isoleucine and the peptide L-leucyl-L-isoleucine showed greater efficiency in translocating GLUT-4 to the PM and of increasing glucose capture by skeletal muscle.
Collapse
Affiliation(s)
- P N Morato
- University of Campinas (UNICAMP), Faculty of Food Engineering (FEA), 13083-862 Campinas, São Paulo, Brazil.
| | | | | | | | | | | |
Collapse
|
28
|
Fam BC, Rose LJ, Sgambellone R, Ruan Z, Proietto J, Andrikopoulos S. Normal muscle glucose uptake in mice deficient in muscle GLUT4. J Endocrinol 2012; 214:313-27. [PMID: 22736482 DOI: 10.1530/joe-12-0032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Skeletal muscle insulin resistance is a major characteristic underpinning type 2 diabetes. Impairments in the insulin responsiveness of the glucose transporter, Glut4 (Slc2a4), have been suggested to be a contributing factor to this disturbance. We have produced muscle-specific Glut4 knockout (KO) mice using Cre/LoxP technology on a C57BL6/J background and shown undetectable levels of GLUT4 in both skeletal muscle and heart. Our aim was to determine whether complete deletion of muscle GLUT4 does in fact lead to perturbations in glucose homoeostasis. Glucose tolerance, glucose turnover and 2-deoxyglucose uptake into muscle and fat under basal and insulin-stimulated conditions were assessed in 12-week-old KO and control mice using the oral glucose tolerance test (OGTT) and hyperinsulinaemic/euglycaemic clamp respectively. KO mice weighed ~17% less and had significantly heavier hearts compared with control mice. Basally, plasma glucose and plasma insulin were significantly lower in the KO compared with control mice, which conferred normal glucose tolerance. Despite the lack of GLUT4 in the KO mouse muscle, glucose uptake was not impaired in skeletal muscle but was reduced in heart under insulin-stimulated conditions. Neither GLUT1 nor GLUT12 protein levels were altered in the skeletal muscle or heart tissue of our KO mice. High-fat feeding did not alter glucose tolerance in the KO mice but led to elevated plasma insulin levels during the glucose tolerance test. Our study demonstrates that deletion of muscle GLUT4 does not adversely affect glucose disposal and glucose tolerance and that compensation from other transporters may contribute to this unaltered homoeostasis of glucose.
Collapse
Affiliation(s)
- Barbara C Fam
- Department of Medicine (Austin Health), Austin Hospital, University of Melbourne, Heidelberg, Victoria 3084, Australia.
| | | | | | | | | | | |
Collapse
|
29
|
Exercise in the metabolic syndrome. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2012; 2012:349710. [PMID: 22829955 PMCID: PMC3399489 DOI: 10.1155/2012/349710] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Accepted: 05/13/2012] [Indexed: 02/06/2023]
Abstract
The metabolic syndrome is a clustering of obesity, diabetes, hyperlipidemia, and hypertension that is occurring in increasing frequency across the global population. Although there is some controversy about its diagnostic criteria, oxidative stress, which is defined as imbalance between the production and inactivation of reactive oxygen species, has a major pathophysiological role in all the components of this disease. Oxidative stress and consequent inflammation induce insulin resistance, which likely links the various components of this disease. We briefly review the role of oxidative stress as a major component of the metabolic syndrome and then discuss the impact of exercise on these pathophysiological pathways. Included in this paper is the effect of exercise in reducing fat-induced inflammation, blood pressure, and improving muscular metabolism.
Collapse
|
30
|
Gong H, Zhang Y. GLUT4 is not essential for exercise-induced exaggerated muscle glycogen degradation in AMPKα2 knockout mice. J Exerc Sci Fit 2012. [DOI: 10.1016/j.jesf.2012.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
|
31
|
Magnoni LJ, Vraskou Y, Palstra AP, Planas JV. AMP-activated protein kinase plays an important evolutionary conserved role in the regulation of glucose metabolism in fish skeletal muscle cells. PLoS One 2012; 7:e31219. [PMID: 22359576 PMCID: PMC3281052 DOI: 10.1371/journal.pone.0031219] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Accepted: 01/04/2012] [Indexed: 12/16/2022] Open
Abstract
AMPK, a master metabolic switch, mediates the observed increase of glucose uptake in locomotory muscle of mammals during exercise. AMPK is activated by changes in the intracellular AMP:ATP ratio when ATP consumption is stimulated by contractile activity but also by AICAR and metformin, compounds that increase glucose transport in mammalian muscle cells. However, the possible role of AMPK in the regulation of glucose metabolism in skeletal muscle has not been investigated in other vertebrates, including fish. In this study, we investigated the effects of AMPK activators on glucose uptake, AMPK activity, cell surface levels of trout GLUT4 and expression of GLUT1 and GLUT4 as well as the expression of enzymes regulating glucose disposal and PGC1α in trout myotubes derived from a primary muscle cell culture. We show that AICAR and metformin significantly stimulated glucose uptake (1.6 and 1.3 fold, respectively) and that Compound C completely abrogated the stimulatory effects of the AMPK activators on glucose uptake. The combination of insulin and AMPK activators did not result in additive nor synergistic effects on glucose uptake. Moreover, exposure of trout myotubes to AICAR and metformin resulted in an increase in AMPK activity (3.8 and 3 fold, respectively). We also provide evidence suggesting that stimulation of glucose uptake by AMPK activators in trout myotubes may take place, at least in part, by increasing the cell surface and mRNA levels of trout GLUT4. Finally, AICAR increased the mRNA levels of genes involved in glucose disposal (hexokinase, 6-phosphofructokinase, pyruvate kinase and citrate synthase) and mitochondrial biogenesis (PGC-1α) and did not affect glycogen content or glycogen synthase mRNA levels in trout myotubes. Therefore, we provide evidence, for the first time in non-mammalian vertebrates, suggesting a potentially important role of AMPK in stimulating glucose uptake and utilization in the skeletal muscle of fish.
Collapse
Affiliation(s)
- Leonardo J. Magnoni
- Departament de Fisiologia i Immunologia, Facultat de Biologia, Universitat de Barcelona I Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Spain
| | - Yoryia Vraskou
- Departament de Fisiologia i Immunologia, Facultat de Biologia, Universitat de Barcelona I Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Spain
| | - Arjan P. Palstra
- Departament de Fisiologia i Immunologia, Facultat de Biologia, Universitat de Barcelona I Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Spain
| | - Josep V. Planas
- Departament de Fisiologia i Immunologia, Facultat de Biologia, Universitat de Barcelona I Institut de Biomedicina de la Universitat de Barcelona (IBUB), Barcelona, Spain
- * E-mail:
| |
Collapse
|
32
|
van Bon AC, Verbitskiy E, von Basum G, Hoekstra JBL, DeVries JH. Exercise in closed-loop control: a major hurdle. J Diabetes Sci Technol 2011; 5:1337-41. [PMID: 22226250 PMCID: PMC3262699 DOI: 10.1177/193229681100500604] [Citation(s) in RCA: 17] [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] [Indexed: 11/17/2022]
Abstract
BACKGROUND People with type 1 diabetes mellitus (T1DM) are at risk for exercise-induced hypoglycemia. Prevention of such hypoglycemia in a closed-loop setting is a major challenge. Markers for automated detection of physical activity could be heart rate (HR) and body acceleration counts (AC). Correlations between HR, AC, and glucose concentrations before and after moderate intensity exercise were examined in T1DM patients during open- loop control. METHOD Eleven T1DM subjects treated with an insulin pump performed moderate intensity exercise of 30 min. Glucose profiles, insulin concentrations, HR, and acceleration were measured. RESULTS Mean (range) glucose decrease during exercise was 1.4 (0 to 3.3) mmol/liter. The mean increase in HR was 45.2 beats per minutes (15 to 106 bpm). Mean increase in AC was 18,000 (3,000 to 25,000). No correlations were seen between the glucose drop and HR or AC. A trend was observed between the increase in HR and increase in AC. CONCLUSION Moderate intensity exercise resulted in increased HR and body AC while it decreased glucose concentrations but, in this real-time setting, no association could be demonstrated between the glucose decrease and increase in HR or AC.
Collapse
|
33
|
Palstra AP, Planas JV. Fish under exercise. FISH PHYSIOLOGY AND BIOCHEMISTRY 2011; 37:259-72. [PMID: 21611721 PMCID: PMC3107430 DOI: 10.1007/s10695-011-9505-0] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Accepted: 02/14/2011] [Indexed: 05/11/2023]
Abstract
Improved knowledge on the swimming physiology of fish and its application to fisheries science and aquaculture (i.e., farming a fitter fish) is currently needed in the face of global environmental changes, high fishing pressures, increased aquaculture production as well as increased concern on fish well-being. Here, we review existing data on teleost fish that indicate that sustained exercise at optimal speeds enhances muscle growth and has consequences for flesh quality. Potential added benefits of sustained exercise may be delay of ovarian development and stimulation of immune status. Exercise could represent a natural, noninvasive, and economical approach to improve growth, flesh quality as well as welfare of aquacultured fish: a FitFish for a healthy consumer. All these issues are important for setting directions for policy decisions and future studies in this area. For this purpose, the FitFish workshop on the Swimming Physiology of Fish ( http://www.ub.edu/fitfish2010 ) was organized to bring together a multidisciplinary group of scientists using exercise models, industrial partners, and policy makers. Sixteen international experts from Europe, North America, and Japan were invited to present their work and view on migration of fishes in their natural environment, beneficial effects of exercise, and applications for sustainable aquaculture. Eighty-eight participants from 19 different countries contributed through a poster session and round table discussion. Eight papers from invited speakers at the workshop have been contributed to this special issue on The Swimming Physiology of Fish.
Collapse
Affiliation(s)
- Arjan P. Palstra
- Departament de Fisiologia, Facultat de Biologia, Universitat de Barcelona and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Av. Diagonal 645, 08028 Barcelona, Spain
- Present Address: Institute for Marine Resources and Ecosystem Studies (IMARES) of the Wageningen University, P.O. Box 77, 4400 AB Yerseke, The Netherlands
| | - Josep V. Planas
- Departament de Fisiologia, Facultat de Biologia, Universitat de Barcelona and Institut de Biomedicina de la Universitat de Barcelona (IBUB), Av. Diagonal 645, 08028 Barcelona, Spain
| |
Collapse
|
34
|
Duehlmeier R, Hacker A, Widdel-Bigdely A, Engelhardt WV, Sallmann HP. Insulin stimulates GLUT4 translocation in the semitendinosus muscle of Shetland ponies. Vet J 2010; 184:176-81. [DOI: 10.1016/j.tvjl.2009.01.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Revised: 01/23/2009] [Accepted: 01/31/2009] [Indexed: 02/07/2023]
|
35
|
Stuart CA, Howell MEA, Baker JD, Dykes RJ, Duffourc MM, Ramsey MW, Stone MH. Cycle training increased GLUT4 and activation of mammalian target of rapamycin in fast twitch muscle fibers. Med Sci Sports Exerc 2010; 42:96-106. [PMID: 20010125 DOI: 10.1249/mss.0b013e3181ad7f36] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE To determine whether cycle training of sedentary subjects would increase the expression of the principle muscle glucose transporters, six volunteers completed 6 wk of progressively increasing intensity stationary cycle cycling. METHODS In vastus lateralis muscle biopsies, changes in expression of GLUT1, GLUT4, GLUT5, and GLUT12 were compared using quantitative immunoblots with specific protein standards. Regulatory pathway components were evaluated by immunoblots of muscle homogenates and immunohistochemistry of microscopic sections. RESULTS GLUT1 was unchanged, GLUT4 increased 66%, GLUT12 increased 104%, and GLUT5 decreased 72%. A mitochondrial marker (cytochrome c) and regulators of mitochondrial biogenesis (peroxisome proliferator-activated receptor gamma coactivator 1 alpha and phospho-5'-adenosine monophosphate-activated protein kinase) were unchanged, but the muscle hypertrophy pathway component, phospho-mammalian target of rapamycin (mTOR), increased 83% after the exercise program. In baseline biopsies, GLUT4 by immunohistochemical techniques was 37% greater in Type I (slow twitch, red) muscle fibers, but the exercise training increased GLUT4 expression in Type II (fast twitch, white) fibers by 50%, achieving parity with the Type I fibers. Baseline phospho-mTOR expression was 50% higher in Type II fibers and increased more in Type II fibers (62%) with training but also increased in Type I fibers (34%). CONCLUSION Progressive intensity stationary cycle training of previously sedentary subjects increased muscle insulin-responsive glucose transporters (GLUT4 and GLUT12) and decreased the fructose transporter (GLUT5). The increase in GLUT4 occurred primarily in Type II muscle fibers, and this coincided with activation of the mTOR muscle hypertrophy pathway. There was little impact on Type I fiber GLUT4 expression and no evidence of change in mitochondrial biogenesis.
Collapse
Affiliation(s)
- Charles A Stuart
- Department of Internal Medicine, Quillen College of Medicine, East Tennessee State University, Johnson City, TN 37614, USA.
| | | | | | | | | | | | | |
Collapse
|
36
|
Cerebellar neurons possess a vesicular compartment structurally and functionally similar to Glut4-storage vesicles from peripheral insulin-sensitive tissues. J Neurosci 2009; 29:5193-201. [PMID: 19386915 DOI: 10.1523/jneurosci.0858-09.2009] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The insulin-sensitive isoform of the glucose transporting protein, Glut4, is expressed in fat as well as in skeletal and cardiac muscle and is responsible for the effect of insulin on blood glucose clearance. Recent studies have revealed that Glut4 is also expressed in the brain, although the intracellular compartmentalization and regulation of Glut4 in neurons remains unknown. Using sucrose gradient centrifugation, immunoadsorption and immunofluorescence staining, we have shown that Glut4 in the cerebellum is localized in intracellular vesicles that have the sedimentation coefficient, the buoyant density, and the protein composition similar to the insulin-responsive Glut4-storage vesicles from fat and skeletal muscle cells. In cultured cerebellar neurons, insulin stimulates glucose uptake and causes translocation of Glut4 to the cell surface. Using 18FDG (18fluoro-2-deoxyglucose) positron emission tomography, we found that physical exercise acutely increases glucose uptake in the cerebellum in vivo. Prolonged physical exercise increases expression of the Glut4 protein in the cerebellum. Our results suggest that neurons have a novel type of translocation-competent vesicular compartment which is regulated by insulin and physical exercise similar to Glut4-storage vesicles in peripheral insulin target tissues.
Collapse
|
37
|
Man CD, Breton MD, Cobelli C. Physical activity into the meal glucose-insulin model of type 1 diabetes: in silico studies. J Diabetes Sci Technol 2009; 3:56-67. [PMID: 20046650 PMCID: PMC2769836 DOI: 10.1177/193229680900300107] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
INTRODUCTION A simulation model of a glucose-insulin system accounting for physical activity is needed to reliably simulate normal life conditions, thus accelerating the development of an artificial pancreas. In fact, exercise causes a transient increase of insulin action and may lead to hypoglycemia. However, physical activity is difficult to model. In the past, it was described indirectly as a rise in insulin. Recently, a new parsimonious model of exercise effect on glucose homeostasis has been proposed that links the change in insulin action and glucose effectiveness to heart rate (HR). The aim of this study was to plug this exercise model into our recently proposed large-scale simulation model of glucose metabolism in type 1 diabetes to better describe normal life conditions. METHODS The exercise model describes changes in glucose-insulin dynamics in two phases: a rapid on-and-off change in insulin-independent glucose clearance and a rapid-on/slow-off change in insulin sensitivity. Three candidate models of glucose effectiveness and insulin sensitivity as a function of HR have been considered, both during exercise and recovery after exercise. By incorporating these three models into the type 1 diabetes model, we simulated different levels (from mild to moderate) and duration of exercise (15 and 30 minutes), both in steady-state (e.g., during euglycemic-hyperinsulinemic clamp) and in nonsteady state (e.g., after a meal) conditions. RESULTS One candidate exercise model was selected as the most reliable. CONCLUSIONS A type 1 diabetes model also describing physical activity is proposed. The model represents a step forward to accurately describe glucose homeostasis in normal life conditions; however, further studies are needed to validate it against data.
Collapse
Affiliation(s)
- Chiara Dalla Man
- Department of Information Engineering, University of Padova, Padova, Italy
| | - Marc D. Breton
- Diabetes Technology Center, University of Virginia, Charlottesville, Virginia
| | - Claudio Cobelli
- Department of Information Engineering, University of Padova, Padova, Italy
| |
Collapse
|
38
|
Gaster M. Fibre Type Dependent Expression of Glucose Transporters in Human Skeletal Muscles. APMIS 2008. [DOI: 10.1111/j.1600-0463.2007.apmv115s121.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
39
|
Abstract
This article presents a mathematical model of glucose homeostasis that is valid during physical activity. Known changes in glucose dynamics during exercise were accounted for in the model, and exercise itself was detected and quantified through heart rate (beats per minute). The model was successfully fit to 21 type 1 diabetic subjects during a hyperinsulemic clamp protocol, and performance of the new model was compared with the standard minimal model of glucose kinetics that it was derived from.
Collapse
Affiliation(s)
- Marc D Breton
- Psychiatric and Neurobehavioral Sciences Department, University of Virginia, Charlottesville, Virginia 22908-0223, USA.
| |
Collapse
|
40
|
Affiliation(s)
- Michael Gaster
- Institute of Pathology and Department of Endocrinology, Odense University Hospital, 5000 Odense C
| |
Collapse
|
41
|
Armoni M, Harel C, Karnieli E. Transcriptional regulation of the GLUT4 gene: from PPAR-gamma and FOXO1 to FFA and inflammation. Trends Endocrinol Metab 2007; 18:100-7. [PMID: 17317207 DOI: 10.1016/j.tem.2007.02.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2006] [Revised: 01/17/2007] [Accepted: 02/09/2007] [Indexed: 01/22/2023]
Abstract
The insulin-responsive glucose transporter 4 (GLUT4) has a major role in glucose uptake and metabolism in insulin target tissues (i.e. adipose and muscle cells). In these tissues, the peroxisome proliferator-activated receptor (PPAR) family of nuclear receptors and the winged-helix-forkhead box class O (FOXO) family of factors are two key families of transcription factors that regulate glucose homeostasis and insulin responsiveness. Type 2 diabetes mellitus and obesity are associated with impaired regulation of GLUT4 gene expression and elevated levels of free fatty acids and proinflammatory factors. Based on our studies of the interplay between PPAR-gamma, FOXO1 and free fatty acids, and inflammation in regulating GLUT4 transcription in sickness and in health, we suggest a novel paradigm to increase insulin sensitivity in bona fide insulin target cells.
Collapse
Affiliation(s)
- Michal Armoni
- Institute of Endocrinology, Diabetes and Metabolism, Rambam Medical Center, Technion-Israel Institute of Technology, Haifa, 31096, Israel
| | | | | |
Collapse
|
42
|
Tsatsoulis A, Fountoulakis S. The protective role of exercise on stress system dysregulation and comorbidities. Ann N Y Acad Sci 2007; 1083:196-213. [PMID: 17148741 DOI: 10.1196/annals.1367.020] [Citation(s) in RCA: 158] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The human body, when under threat, elicits a set of neuroendocrine responses, including an increased secretion of glucocorticoids (GCs) and catecholamines from the adrenal gland and the activation of the sympathetic nervous system. These hormonal secretions allow a "fight or flight" response by mobilizing endogenous substrate and inducing a state of insulin resistance in the liver and skeletal muscles. Although the stress response was essential in ancient times to survive physical aggression, this threat has disappeared in our industrialized societies. However, in today's environment, the same stress responses can be elicited by emotional stimuli or professional and social stress. Such psychological stress may be protracted and unrelated to an increased metabolic demand. Thus, the energy mobilized is not used but is stored in visceral fat depots by the combined action of hypercortisolism and hyperinsulinemia. In addition, chronic activation of the stress system causes suppression of the gonadal, growth hormone (GH), and thyroid axes. These metabolic disturbances, in concert, lead to the clinical expression of a number of comorbidities including central obesity, hypertension, dyslipidemia, and endothelial dysfunction, all components of the metabolic syndrome and cardiometabolic risk factors. Moreover, chronic stress has deleterious effects on the brain and, in particular, affects hippocampal structure and function leading to cognitive and mood disturbances. Importantly, this stress-induced clinical phenotype is likely to be exaggerated in the presence of physical inactivity, resulting in a "stress-induced/exercise deficient" phenotype. Assuming that the stress response is a neuroendocrine mechanism that occurs in anticipation of physical action, then physical activity should be the natural means to prevent the consequences of stress. Indeed, accumulating evidence documents the beneficial effects of regular exercise in preventing or ameliorating the metabolic and psychological comorbidities induced by chronic stress. These benefits are thought to derive from a central effect of exercise to reduce the sensitivity to stress and also peripheral actions influencing metabolic functions and, in particular, insulin sensitivity and the partitioning of fuels toward oxidation rather than storage. It is concluded that chronic psychosocial stress, in the presence of physical inactivity, is likely to contribute to the epidemic of cardiometabolic and emotional disease of our current society. The way to prevent and combat this burden is by regular exercise.
Collapse
|
43
|
Abstract
Competitive soccer engages many of the body's systems to a major extent. The musculoskeletal, nervous, immune and metabolic systems are stressed to a point where recovery strategies post-exercise become influential in preparing for the next match. Intense activity at a 7-day training camp causes participants to experience lowered concentrations of non-killer cells and T-helper cells. Two consecutive games in 24 h produce disturbances in the testosterone-cortisol ratio. When competitive schedules are congested, the recovery process should be optimized for performance capabilities to be restored to normal as soon as possible. There is evidence that glycogen stores are reduced near to depletion at the end of a soccer game and that a diet high in carbohydrates can aid recovery. Water alone is not the best means of restoring body fluids, since carbohydrate-electrolyte drinks display better intestinal absorption and reduce urine output. Some relief from muscle soreness may be achieved by means of a warm-down. Deep-water running regimens can replace conventional physical training in the days after competition. Massage, cryotherapy and alternative therapies have not been shown to be consistently effective. It is concluded that optimizing recovery post-exercise depends on a combination of factors that incorporate a consideration of individual differences and lifestyle factors. The procedures to facilitate recovery processes should start immediately the game or training finishes. Match administrators and tournament planners should consider the stressful consequences for players in periods of congested fixtures and alleviate the physiological strain as far as possible by allowing 72 h between competitive games. This frequency of competition is unlikely to be sustainable in the long term.
Collapse
Affiliation(s)
- Thomas Reilly
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK.
| | | |
Collapse
|
44
|
Zoll J, Ponsot E, Dufour S, Doutreleau S, Ventura-Clapier R, Vogt M, Hoppeler H, Richard R, Flück M. Exercise training in normobaric hypoxia in endurance runners. III. Muscular adjustments of selected gene transcripts. J Appl Physiol (1985) 2007; 100:1258-66. [PMID: 16540710 DOI: 10.1152/japplphysiol.00359.2005] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We hypothesized that specific muscular transcript level adaptations participate in the improvement of endurance performances following intermittent hypoxia training in endurance-trained subjects. Fifteen male high-level, long-distance runners integrated a modified living low-training high program comprising two weekly controlled training sessions performed at the second ventilatory threshold for 6 wk into their normal training schedule. The athletes were randomly assigned to either a normoxic (Nor) (inspired O2 fraction = 20.9%, n = 6) or a hypoxic group exercising under normobaric hypoxia (Hyp) (inspired O2 fraction = 14.5%, n = 9). Oxygen uptake and speed at second ventilatory threshold, maximal oxygen uptake (VO2 max), and time to exhaustion (Tlim) at constant load at VO2 max velocity in normoxia and muscular levels of selected mRNAs in biopsies were determined before and after training. VO2 max (+5%) and Tlim (+35%) increased specifically in the Hyp group. At the molecular level, mRNA concentrations of the hypoxia-inducible factor 1alpha (+104%), glucose transporter-4 (+32%), phosphofructokinase (+32%), peroxisome proliferator-activated receptor gamma coactivator 1alpha (+60%), citrate synthase (+28%), cytochrome oxidase 1 (+74%) and 4 (+36%), carbonic anhydrase-3 (+74%), and manganese superoxide dismutase (+44%) were significantly augmented in muscle after exercise training in Hyp only. Significant correlations were noted between muscular mRNA levels of monocarboxylate transporter-1, carbonic anhydrase-3, glucose transporter-4, and Tlim only in the group of athletes who trained in hypoxia (P < 0.05). Accordingly, the addition of short hypoxic stress to the regular endurance training protocol induces transcriptional adaptations in skeletal muscle of athletic subjects. Expressional adaptations involving redox regulation and glucose uptake are being recognized as a potential molecular pathway, resulting in improved endurance performance in hypoxia-trained subjects.
Collapse
Affiliation(s)
- Joffrey Zoll
- Department of Anatomy, University of Bern, Bühlstrasse 26, 3000 Bern 9, Switzerland
| | | | | | | | | | | | | | | | | |
Collapse
|
45
|
De Filippis E, Cusi K, Ocampo G, Berria R, Buck S, Consoli A, Mandarino LJ. Exercise-induced improvement in vasodilatory function accompanies increased insulin sensitivity in obesity and type 2 diabetes mellitus. J Clin Endocrinol Metab 2006; 91:4903-10. [PMID: 17018657 DOI: 10.1210/jc.2006-1142] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE The present study was undertaken to determine whether improved vasodilatory function accompanies increased insulin sensitivity in overweight, insulin-resistant subjects (OW) and type 2 diabetic patients (T2DM) who participated in an 8-wk exercise training regimen. DESIGN Before and after training, subjects had euglycemic clamps to determine insulin sensitivity. Brachial artery catheterization was done on another occasion for measurement of vasodilatory function. A lean, healthy, untrained group was studied as nonexercised controls. RESULTS Training increased oxygen consumption (VO2) peak [OW, 29 +/- 1 to 37 +/- 4 ml/kg fat-free mass (FFM).min; T2DM, 33 +/- 2 to 43 +/- 3 ml/kg FFM.min; P < 0.05] and improved insulin-stimulated glucose disposal (OW, 6.5 +/- 0.5 to 7.2 +/- 0.4 mg/kg FFM.min; T2DM, 3.8 +/- 0.3 to 4.2 +/- 0.3 mg/kg FFM.min; P < 0.05) in insulin resistance. OW and T2DM, before training, had decreased acetylcholine chloride (ACh)- and sodium nitroprusside-mediated vasodilation and decreased reactive hyperemia compared with lean controls. Training increased the vasodilatory response to ACh [OW (30 microg ACh/min), 12.2 +/- 3.4 to 19 +/- 4.2 ml/100 g.min; T2DM (30 microg ACh/min), 10.1 +/- 1.5 to 14.2 +/- 2.1 ml/100 g.min; P < 0.05] in both groups without affecting nitroprusside response. CONCLUSION Because vasodilatory dysfunction has been postulated to contribute to insulin resistance, the exercise-induced improvement in vasodilatory function may signify changes in the endothelium that could contribute to the improvement in insulin sensitivity observed after aerobic exercise training.
Collapse
Affiliation(s)
- Elena De Filippis
- Center for Metabolic Biology, Arizona State University, 350 East Orange Street, P.O. Box 873704, Tempe, Arizona 85287-3704, USA
| | | | | | | | | | | | | |
Collapse
|
46
|
Kraniou GN, Cameron-Smith D, Hargreaves M. Acute exercise and GLUT4 expression in human skeletal muscle: influence of exercise intensity. J Appl Physiol (1985) 2006; 101:934-7. [PMID: 16763099 DOI: 10.1152/japplphysiol.01489.2005] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
To examine the influence of exercise intensity on the increases in vastus lateralis GLUT4 mRNA and protein after exercise, six untrained men exercised for 60 min at 39 ± 3% peak oxygen consumption (V̇o2 peak) (Lo) or 27 ± 2 min at 83 ± 2% V̇o2 peak(Hi) in counterbalanced order. Preexercise muscle glycogen levels were not different between trials (Lo: 408 ± 35 mmol/kg dry mass; Hi: 420 ± 43 mmol/kg dry mass); however, postexercise levels were lower ( P < 0.05) in Hi (169 ± 18 mmol/kg dry mass) compared with Lo (262 ± 35 mmol/kg dry mass). Thus calculated muscle glycogen utilization was greater ( P < 0.05) in Hi (251 ± 24 mmol/kg) than in Lo (146 ± 34). Exercise resulted in similar increases in GLUT4 gene expression in both trials. GLUT4 mRNA was increased immediately at the end of exercise (∼2-fold; P < 0.05) and remained elevated after 3 h of postexercise recovery. When measured 3 h after exercise, total crude membrane GLUT4 protein levels were 106% higher in Lo (3.3 ± 0.7 vs. 1.6 ± 0.3 arbitrary units) and 61% higher in Hi (2.9 ± 0.5 vs. 1.8 ± 0.5 arbitrary units) relative to preexercise levels. A main effect for exercise was observed, with no significant differences between trials. In conclusion, exercise at ∼40 and ∼80% V̇o2 peak, with total work equal, increased GLUT4 mRNA and GLUT4 protein in human skeletal muscle to a similar extent, despite differences in exercise intensity and duration.
Collapse
Affiliation(s)
- Giorgos N Kraniou
- School of Exercise and Nutrition Sciences, Deakin University, Burwood, Victoria, Australia
| | | | | |
Collapse
|
47
|
Chen SY, Chen SM, Chang WH, Lai CH, Chen MC, Chou CH, Kuo CH. Effect of 2-month detraining on body composition and insulin sensitivity in young female dancers. Int J Obes (Lond) 2006; 30:40-4. [PMID: 16158083 DOI: 10.1038/sj.ijo.0803073] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To investigate the effect of 2-month detraining on body composition and glucose tolerance for female collegiate dancers. DESIGN Longitudinal study of dancers who stopped their regular training for 2 months. SUBJECTS 16 female collegiate dancers (age: 19.7 +/-0.11 year, body mass index (BMI): 20.7 +/- 0.56 kg/m(2)). MEASUREMENTS BMI, waist-to-hip ratio (WHR), oral glucose tolerance test (OGTT), insulin response during OGTT, and blood lipids at baseline and after a 2-month detraining. RESULTS Glucose tolerance was not significantly affected by the detraining, but the fasted insulin and insulin levels during OGTT were significantly elevated. Fasted free fatty acid (FFA) and triglyceride levels were significantly elevated without change in cholesterol level. BMI was not significantly altered during this detraining period, but the waist circumference and WHR ratio were significantly elevated. CONCLUSION Only a 2-month cessation of regular training in female dancers significantly elevated basal and postprandial insulin levels and triglycerides, and were associated with increased basal FFA. This result appears to be partly related to the increased central fatness but not body mass, indicating that the early development of obesity due to reduced physical activity may not necessarily reflect on weight status. A warning is thus warranted for those young women who depend on weight measurement for body fat status monitoring.
Collapse
Affiliation(s)
- S-Y Chen
- Department of Dance and Laboratory of Exercise Biochemistry, Taipei Physical Education College, Taiwan, ROC
| | | | | | | | | | | | | |
Collapse
|
48
|
Tsai YL, Hou CW, Liao YH, Chen CY, Lin FC, Lee WC, Chou SW, Kuo CH. Exercise training exacerbates tourniquet ischemia-induced decreases in GLUT4 expression and muscle atrophy in rats. Life Sci 2006; 78:2953-9. [PMID: 16436283 DOI: 10.1016/j.lfs.2005.11.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2005] [Revised: 11/04/2005] [Accepted: 11/17/2005] [Indexed: 11/25/2022]
Abstract
The current study determined the interactive effects of ischemia and exercise training on glycogen storage and GLUT4 expression in skeletal muscle. For the first experiment, an acute 1-h tourniquet ischemia was applied to one hindlimb of both the 1-week exercise-trained and untrained rats. The contralateral hindlimb served as control. For the second experiment, 1-h ischemia was applied daily for 1 week to both trained (5 h post-exercise) and untrained rats. GLUT4 mRNA was not affected by acute ischemia, but exercise training lowered GLUT4 mRNA in the acute ischemic muscle. GLUT4 protein levels were elevated by exercise training, but not in the acute ischemic muscle. Exercise training elevated muscle glycogen above untrained levels, but this increase was reversed by chronic ischemia. GLUT4 mRNA and protein levels were dramatically reduced by chronic ischemia, regardless of whether the animals were exercise-trained or not. Chronic ischemia significantly reduced plantaris muscle mass, with a greater decrease found in the exercise-trained rats. In conclusion, the exercise training effect on muscle GLUT4 protein expression was prevented by acute ischemia. Furthermore, chronic ischemia-induced muscle atrophy was exacerbated by exercise training. This result implicates that exercise training could be detrimental to skeletal muscle with severely impaired microcirculation.
Collapse
Affiliation(s)
- Ying-Lan Tsai
- Department of Athletic Training and Health, National College of Physical Education and Sports, Taoyuan 333, Taiwan, ROC
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Silva JLT, Giannocco G, Furuya DT, Lima GA, Moraes PAC, Nachef S, Bordin S, Britto LRG, Nunes MT, Machado UF. NF-kappaB, MEF2A, MEF2D and HIF1-a involvement on insulin- and contraction-induced regulation of GLUT4 gene expression in soleus muscle. Mol Cell Endocrinol 2005; 240:82-93. [PMID: 16024167 DOI: 10.1016/j.mce.2005.05.006] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2004] [Revised: 05/13/2005] [Accepted: 05/20/2005] [Indexed: 02/07/2023]
Abstract
The GLUT4 gene transcriptional activity has a profound impact on the insulin-mediated glucose disposal and it is, therefore, important to understand the mechanisms underlying it. Insulin and exercise modulate GLUT4 expression in vivo, but the net control and involved mechanisms of each one have not been established yet. This paper sought to discriminate, in soleus muscle, the effects of insulin and muscle contraction on GLUT4 gene expression, and the involvement of transcriptional factors: myocite enhancer factor 2 (MEF2 A/C/D), hypoxia inducible factor 1-a (HIF1-a) and nuclear factor-kappa B (NF-kappaB). The GLUT4 mRNA was reduced by fasting (40%), and increased by in vitro incubation with insulin (25%) or insulin plus glucose (40%), which was accompanied by opposite regulations of NF-kappaB mRNA. Differently, in vitro, muscle contraction led to a rapid increase (35-80%) in GLUT4, MEF2A, MEF2D and HIF1-a mRNAs. Additionally, electrophoretic mobility shift assay confirmed changes in the binding activity of nuclear proteins to consensus NF-kappaB, GLUT4-Ebox and GLUT4-AT-rich element probes, parallel to the mRNA changes of their respective transcriptional factors NF-kappaB, HIF1-a and MEF2s. Concluding, insulin- and contraction-induced regulation of GLUT4 expression involves distinct transcriptional factors.
Collapse
Affiliation(s)
- Jose L T Silva
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Brazil
| | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Kretschmer BD, Schelling P, Beier N, Liebscher C, Treutel S, Krüger N, Scholz HP, Haus A. Modulatory role of food, feeding regime and physical exercise on body weight and insulin resistance. Life Sci 2004; 76:1553-73. [PMID: 15680166 DOI: 10.1016/j.lfs.2004.08.028] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2004] [Accepted: 08/03/2004] [Indexed: 10/26/2022]
Abstract
Energy intake and expenditure is a highly conserved and well-controlled system with a bias toward energy intake. In times of abundant food supply, individuals tend to overeat and in consequence to increase body weight, sometimes to the point of clinical obesity. Obesity is a disease that is not only characterized by enormous body weight but also by rising morbidity for diabetes type II and cardiovascular complications. To better understand the critical factors contributing to obesity we performed the present study in which the effects of energy expenditure and energy intake were examined with respect to body weight, localization of fat and insulin resistance in normal Wistar rats. It was found that a diet rich in fat and carbohydrates similar to "fast food" (cafeteria diet) has pronounced implication in the development of obesity, leading to significant body weight gain, fat deposition and also insulin resistance. Furthermore, an irregularly presented cafeteria diet (yoyo diet) has similar effects on body weight and fat deposition. However, these rats were not resistant to insulin, but showed an increased insulin secretion in response to glucose. When rats were fed with a specified high fat/carbohydrate diet (10% fat, 56.7% carbohydrate) ad lib or at the beginning of their activity phase they were able to detect the energy content of the food and compensate this by a lower intake. They, however, failed to compensate when food was given in the resting phase and gained more body weight as controls. Exercise, even of short duration, was able to keep rats on lower body weight and reduced fat deposition. Thus, inappropriate food intake with different levels of energy content is able to induce obesity in normal rats with additional metabolic changes that can be also observed in humans.
Collapse
Affiliation(s)
- Beate D Kretschmer
- Merck KGaA, Preclinical Research, Frankfurter Str. 250, 64293 Darmstadt, Germany.
| | | | | | | | | | | | | | | |
Collapse
|