1
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Jafar A, Pasqua MR. Postprandial glucose-management strategies in type 1 diabetes: Current approaches and prospects with precision medicine and artificial intelligence. Diabetes Obes Metab 2024; 26:1555-1566. [PMID: 38263540 DOI: 10.1111/dom.15463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/01/2024] [Accepted: 01/05/2024] [Indexed: 01/25/2024]
Abstract
Postprandial glucose control can be challenging for individuals with type 1 diabetes, and this can be attributed to many factors, including suboptimal therapy parameters (carbohydrate ratios, correction factors, basal doses) because of physiological changes, meal macronutrients and engagement in postprandial physical activity. This narrative review aims to examine the current postprandial glucose-management strategies tested in clinical trials, including adjusting therapy settings, bolusing for meal macronutrients, adjusting pre-exercise and postexercise meal boluses for postprandial physical activity, and other therapeutic options, for individuals on open-loop and closed-loop therapies. Then we discuss their challenges and future avenues. Despite advancements in insulin delivery devices such as closed-loop systems and decision-support systems, many individuals with type 1 diabetes still struggle to manage their glucose levels. The main challenge is the lack of personalized recommendations, causing suboptimal postprandial glucose control. We suggest that postprandial glucose control can be improved by (i) providing personalized recommendations for meal macronutrients and postprandial activity; (ii) including behavioural recommendations; (iii) using other personalized therapeutic approaches (e.g. glucagon-like peptide-1 receptor agonists, sodium-glucose co-transporter inhibitors, amylin analogues, inhaled insulin) in addition to insulin therapy; and (iv) integrating an interpretability report to explain to individuals about changes in treatment therapy and behavioural recommendations. In addition, we suggest a future avenue to implement precision recommendations for individuals with type 1 diabetes utilizing the potential of deep reinforcement learning and foundation models (such as GPT and BERT), employing different modalities of data including diabetes-related and external background factors (i.e. behavioural, environmental, biological and abnormal events).
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Affiliation(s)
- Adnan Jafar
- Department of Biomedical Engineering, McGill University, Montreal, Quebec, Canada
| | - Melissa-Rosina Pasqua
- Division of Endocrinology, Department of Medicine, McGill University, Montreal, Quebec, Canada
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2
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Helleputte S, Yardley JE, Scott SN, Stautemas J, Jansseune L, Marlier J, De Backer T, Lapauw B, Calders P. Effects of postprandial exercise on blood glucose levels in adults with type 1 diabetes: a review. Diabetologia 2023; 66:1179-1191. [PMID: 37014379 DOI: 10.1007/s00125-023-05910-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 03/03/2023] [Indexed: 04/05/2023]
Abstract
People with type 1 diabetes experience challenges in managing blood glucose around exercise. Previous studies have examined glycaemic responses to different exercise modalities but paid little attention to participants' prandial state, although this is an important consideration and will enhance our understanding of the effects of exercise in order to improve blood glucose management around activity. This review summarises available data on the glycaemic effects of postprandial exercise (i.e. exercise within 2 h after a meal) in people with type 1 diabetes. Using a search strategy on electronic databases, literature was screened until November 2022 to identify clinical trials evaluating acute (during exercise), subacute (≤2 h after exercise) and late (>2 h to ≤24 h after exercise) effects of postprandial exercise in adults with type 1 diabetes. Studies were systematically organised and assessed by exercise modality: (1) walking exercise (WALK); (2) continuous exercise of moderate intensity (CONT MOD); (3) continuous exercise of high intensity (CONT HIGH); and (4) interval training (intermittent high-intensity exercise [IHE] or high-intensity interval training [HIIT]). Primary outcomes were blood glucose change and hypoglycaemia occurrence during and after exercise. All study details and results per outcome were listed in an evidence table. Twenty eligible articles were included: two included WALK sessions, eight included CONT MOD, seven included CONT HIGH, three included IHE and two included HIIT. All exercise modalities caused consistent acute glycaemic declines, with the largest effect size for CONT HIGH and the smallest for HIIT, depending on the duration and intensity of the exercise bout. Pre-exercise mealtime insulin reductions created higher starting blood glucose levels, thereby protecting against hypoglycaemia, in spite of similar declines in blood glucose during activity between the different insulin reduction strategies. Nocturnal hypoglycaemia occurred after higher intensity postprandial exercise, a risk that could be diminished by a post-exercise snack with concomitant bolus insulin reduction. Research on the optimal timing of postprandial exercise is inconclusive. In summary, individuals with type 1 diabetes exercising postprandially should substantially reduce insulin with the pre-exercise meal to avoid exercise-induced hypoglycaemia, with the magnitude of the reduction depending on the exercise duration and intensity. Importantly, pre-exercise blood glucose and timing of exercise should be considered to avoid hyperglycaemia around exercise. To protect against late-onset hypoglycaemia, a post-exercise meal with insulin adjustments might be advisable, especially for exercise in the evening or with a high-intensity component.
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Affiliation(s)
- Simon Helleputte
- Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.
- Fonds Wetenschappelijk Onderzoek (FWO) Vlaanderen, Flanders, Belgium.
| | - Jane E Yardley
- Augustana Faculty, University of Alberta, Edmonton, Alberta, Canada
- Alberta Diabetes Institute, Edmonton, Alberta, Canada
- Faculty of Kinesiology, Sport and Recreation, University of Alberta, Edmonton, Alberta, Canada
- Women and Children's Health Research Institute, Edmonton, Alberta, Canada
| | - Sam N Scott
- Team Novo Nordisk Professional Cycling Team, Atlanta, GA, USA
| | - Jan Stautemas
- Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Laura Jansseune
- Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Joke Marlier
- Department of Endocrinology, Ghent University Hospital, Ghent, Belgium
| | - Tine De Backer
- Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Cardiology, Ghent University Hospital, Ghent, Belgium
| | - Bruno Lapauw
- Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Endocrinology, Ghent University Hospital, Ghent, Belgium
| | - Patrick Calders
- Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
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3
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Armstrong M, Colberg SR, Sigal RJ. Where to Start? Physical Assessment, Readiness, and Exercise Recommendations for People With Type 1 or Type 2 Diabetes. Diabetes Spectr 2023; 36:105-113. [PMID: 37193205 PMCID: PMC10182968 DOI: 10.2337/dsi22-0016] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Exercise plays an important role in the management of diabetes and is associated with many benefits such as decreased morbidity and mortality. For people exhibiting signs and symptoms of cardiovascular disease, pre-exercise medical clearance is warranted; however, requiring broad screening requirements can lead to unnecessary barriers to initiating an exercise program. Robust evidence supports the promotion of both aerobic and resistance training, with evidence emerging on the importance of reducing sedentary time. For people with type 1 diabetes, there are special considerations, including hypoglycemia risk and prevention, exercise timing (including prandial status), and differences in glycemic responses based on biological sex.
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Affiliation(s)
- Marni Armstrong
- Medicine Strategic Clinical Network, Alberta Health Services, Alberta, Canada
- Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Sheri R. Colberg
- Human Movement Sciences Department, Old Dominion University, Norfolk, VA
| | - Ronald J. Sigal
- Departments of Medicine, Cardiac Sciences, and Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
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4
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McCarthy OM, Christensen MB, Kristensen KB, Schmidt S, Ranjan AG, Bain SC, Bracken RM, Nørgaard K. Glycemia Around Exercise in Adults with Type 1 Diabetes Using Automated and Nonautomated Insulin Delivery Pumps: A Switch Pilot Trial. Diabetes Technol Ther 2023; 25:287-292. [PMID: 36724311 DOI: 10.1089/dia.2022.0542] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In an in-patient switch study, 10 adults with type 1 diabetes (T1D) performed 45 min of moderate-intensity exercise on 2 occasions: (1) when using their usual insulin pump (UP) and (2) after transitioning to automated insulin delivery (AID) treatment (MiniMed™ 780G). Consensus glucose management guidelines for performing exercise were applied. Plasma glucose concentrations measured over a 3-h monitoring period were stratified into time below range (TBR, <3.9 mmol/L), time in range (TIR, 3.9-10.0 mmol/L), and time above range (TAR, >10.0 mmol/L). Overall, TBR (UP: 11 ± 21 vs. AID: 3% ± 10%, P = 0.413), TIR (UP: 53 ± 27 vs. AID: 66% ± 39%, P = 0.320), and TAR (UP: 37 ± 34 vs. AID: 31% ± 41%, P = 0.604) were similar between arms. A proportionately low number of people experienced exercise-induced hypoglycemia (UP: n = 2 vs. AID: n = 1, P = 1.00). In conclusion, switching to AID therapy did not alter patterns of glycemia around sustained moderate-intensity exercise in adults with T1D. Clinical Trial Registration number: NCT05133765.
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Affiliation(s)
- Olivia M McCarthy
- Applied Sport, Technology, Exercise and Medicine Research Centre, Swansea University, Swansea, United Kingdom
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, Herlev, Denmark
| | | | | | - Signe Schmidt
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, Herlev, Denmark
| | - Ajenthen G Ranjan
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, Herlev, Denmark
- Danish Diabetes Academy, Odense, Denmark
| | - Stephen C Bain
- Medical School, Swansea University, Swansea, United Kingdom
| | - Richard M Bracken
- Applied Sport, Technology, Exercise and Medicine Research Centre, Swansea University, Swansea, United Kingdom
| | - Kirsten Nørgaard
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, Herlev, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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5
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Ivandic M, Cigrovski Berkovic M, Ormanac K, Sabo D, Omanovic Kolaric T, Kuna L, Mihaljevic V, Canecki Varzic S, Smolic M, Bilic-Curcic I. Management of Glycemia during Acute Aerobic and Resistance Training in Patients with Diabetes Type 1: A Croatian Pilot Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:4966. [PMID: 36981876 PMCID: PMC10049388 DOI: 10.3390/ijerph20064966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 06/18/2023]
Abstract
(1) Background: The increased risk of developing hypoglycemia and worsening of glycemic stability during exercise is a major cause of concern for patients with type 1 diabetes mellitus (T1DM). (2) Aim: This pilot study aimed to assess glycemic stability and hypoglycemic episodes during and after aerobic versus resistance exercises using a flash glucose monitoring system in patients with T1DM. (3) Participants and Methods: We conducted a randomized crossover prospective study including 14 adult patients with T1DM. Patients were randomized according to the type of exercise (aerobic vs. resistance) with a recovery period of three days between a change of groups. Glucose stability and hypoglycemic episodes were evaluated during and 24 h after the exercise. Growth hormone (GH), cortisol, and lactate levels were determined at rest, 0, 30, and 60 min post-exercise period. (4) Results: The median age of patients was 53 years, with a median HbA1c of 7.1% and a duration of diabetes of 30 years. During both training sessions, there was a drop in glucose levels immediately after the exercise (0'), followed by an increase at 30' and 60', although the difference was not statistically significant. However, glucose levels significantly decreased from 60' to 24 h in the post-exercise period (p = 0.001) for both types of exercise. Glycemic stability was comparable prior to and after exercise for both training sessions. No differences in the number of hypoglycemic episodes, duration of hypoglycemia, and average glucose level in 24 h post-exercise period were observed between groups. Time to hypoglycemia onset was prolonged after the resistance as opposed to aerobic training (13 vs. 8 h, p = NS). There were no nocturnal hypoglycemic episodes (between 0 and 6 a.m.) after the resistance compared to aerobic exercise (4 vs. 0, p = NS). GH and cortisol responses were similar between the two sessions, while lactate levels were significantly more increased after resistance training. (5) Conclusion: Both exercise regimes induced similar blood glucose responses during and immediately following acute exercise.
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Affiliation(s)
- Marul Ivandic
- Department of Internal Medicine, University Hospital Osijek, 31000 Osijek, Croatia
| | | | - Klara Ormanac
- Department of Pharmacology, Faculty of Medicine Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Dea Sabo
- Department of Pharmacology, Faculty of Medicine Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Tea Omanovic Kolaric
- Department of Pharmacology, Faculty of Medicine Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
- Department of Pharmacology and Biochemistry, Faculty of Dental Medicine and Health Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Lucija Kuna
- Department of Pharmacology and Biochemistry, Faculty of Dental Medicine and Health Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Vjera Mihaljevic
- Department of Pharmacology and Biochemistry, Faculty of Dental Medicine and Health Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
| | | | - Martina Smolic
- Department of Pharmacology, Faculty of Medicine Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
- Department of Pharmacology and Biochemistry, Faculty of Dental Medicine and Health Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Ines Bilic-Curcic
- Department of Internal Medicine, University Hospital Osijek, 31000 Osijek, Croatia
- Department of Pharmacology, Faculty of Medicine Osijek, J. J. Strossmayer University of Osijek, 31000 Osijek, Croatia
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6
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Eckstein ML, Aziz F, Aberer F, Böckel S, Zimmer RT, Erlmann MP, Sourij H, Moser O. Blood glucose response to running or cycling in individuals with type 1 diabetes: A systematic review and meta-analysis. Diabet Med 2023; 40:e14981. [PMID: 36259159 DOI: 10.1111/dme.14981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 10/03/2022] [Accepted: 10/17/2022] [Indexed: 01/17/2023]
Abstract
AIMS The aim of this systematic review and meta-analysis was to assess how running and cycling influence the magnitude of blood glucose (BG) excursions in individuals with type 1 diabetes. METHODS A systematic literature search was conducted in EMBASE, PubMed, Cochrane Central Register of Controlled Trials, and ISI Web of Knowledge for publications from January 1950 until February 2021. Parameters included for analysis were population (adults and adolescents), exercise type, intensity, duration and insulin preparation. The meta-analysis was performed to estimate the pooled mean with a 95% confidence interval (CI) of delta BG levels. In addition, sub-group and meta-regression analyses were performed to assess the influence of these parameters on delta BG. RESULTS The database search identified 3192 articles of which 69 articles were included in the meta-analysis. Due to crossover designs within articles, 151 different results were included for analysis. Data from 1901 exercise tests of individuals with type 1 diabetes with a mean age of 29 ± 4 years were included. Overall, exercise tests BG decreased by -3.1 mmol/L [-3.4; -2.8] within a mean duration of 46 ± 21 min. The pooled mean decrease in BG for running was -4.1 mmol/L [-4.7; -2.4], whilst the pooled mean decrease in BG for cycling was -2.7 mmol/L [-3.0; -2.4] (p < 0.0001). Overall results can be found in Table S2. CONCLUSIONS Running led to a larger decrease in BG in comparison to cycling. Active individuals with type 1 diabetes should be aware that current recommendations for glycaemic management need to be more specific to the mode of exercise.
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Affiliation(s)
- Max L Eckstein
- BaySpo - Bayreuth Center of Sport Science, Research Group Exercise Physiology and Metabolism, University Bayreuth, Bayreuth, Germany
| | - Faisal Aziz
- Interdisciplinary Metabolic Medicine Trials Unit, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria
| | - Felix Aberer
- BaySpo - Bayreuth Center of Sport Science, Research Group Exercise Physiology and Metabolism, University Bayreuth, Bayreuth, Germany
- Interdisciplinary Metabolic Medicine Trials Unit, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria
| | - Sina Böckel
- BaySpo - Bayreuth Center of Sport Science, Research Group Exercise Physiology and Metabolism, University Bayreuth, Bayreuth, Germany
| | - Rebecca T Zimmer
- BaySpo - Bayreuth Center of Sport Science, Research Group Exercise Physiology and Metabolism, University Bayreuth, Bayreuth, Germany
| | - Maximilian P Erlmann
- BaySpo - Bayreuth Center of Sport Science, Research Group Exercise Physiology and Metabolism, University Bayreuth, Bayreuth, Germany
| | - Harald Sourij
- Interdisciplinary Metabolic Medicine Trials Unit, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria
| | - Othmar Moser
- BaySpo - Bayreuth Center of Sport Science, Research Group Exercise Physiology and Metabolism, University Bayreuth, Bayreuth, Germany
- Interdisciplinary Metabolic Medicine Trials Unit, Division of Endocrinology and Diabetology, Medical University of Graz, Graz, Austria
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7
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Adolfsson P, Taplin CE, Zaharieva DP, Pemberton J, Davis EA, Riddell MC, McGavock J, Moser O, Szadkowska A, Lopez P, Santiprabhob J, Frattolin E, Griffiths G, DiMeglio LA. ISPAD Clinical Practice Consensus Guidelines 2022: Exercise in children and adolescents with diabetes. Pediatr Diabetes 2022; 23:1341-1372. [PMID: 36537529 PMCID: PMC10107219 DOI: 10.1111/pedi.13452] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/07/2022] [Indexed: 12/24/2022] Open
Affiliation(s)
- Peter Adolfsson
- Department of Pediatrics, Kungsbacka Hospital, Kungsbacka, Sweden.,Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Craig E Taplin
- Department of Endocrinology and Diabetes, Perth Children's Hospital, Nedlands, Western Australia, Australia.,Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia.,Centre for Child Health Research, University of Western Australia, Perth, Western Australia, Australia
| | - Dessi P Zaharieva
- Division of Endocrinology, Department of Pediatrics, School of Medicine, Stanford University, Stanford, California, USA
| | - John Pemberton
- Department of Endocrinology and Diabetes, Birmingham Women's and Children's Hospital, Birmingham, UK
| | - Elizabeth A Davis
- Department of Endocrinology and Diabetes, Perth Children's Hospital, Nedlands, Western Australia, Australia.,Telethon Kids Institute, University of Western Australia, Perth, Western Australia, Australia.,Centre for Child Health Research, University of Western Australia, Perth, Western Australia, Australia
| | - Michael C Riddell
- Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Jonathan McGavock
- Faculty of Kinesiology and Recreation Management, University of Manitoba, Winnipeg, Manitoba, Canada.,Diabetes Research Envisioned and Accomplished in Manitoba (DREAM) Theme, Children's Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada.,Department of Pediatrics and Child Health, University of Manitoba, Winnipeg, Manitoba, Canada.,Diabetes Action Canada SPOR Network, Toronto, Ontario, Canada
| | - Othmar Moser
- Division Exercise Physiology and Metabolism, Department of Sport Science, University of Bayreuth, Bayreuth, Germany.,Interdisciplinary Metabolic Medicine Trials Unit, Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Agnieszka Szadkowska
- Department of Pediatrics, Diabetology, Endocrinology & Nephrology, Medical University of Lodz, Lodz, Poland
| | - Prudence Lopez
- Department of Paediatrics, John Hunter Children's Hospital, Newcastle, New South Wales, Australia.,University of Newcastle, Newcastle, New South Wales, Australia
| | - Jeerunda Santiprabhob
- Siriraj Diabetes Center, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.,Division of Endocrinology and Metabolism, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | | | - Linda A DiMeglio
- Department of Pediatrics, Division of Pediatric Endocrinology and Diabetology, Indiana University School of Medicine, Riley Hospital for Children, Indianapolis, Indiana, USA
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8
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McCarthy O, Deere R, Churm R, Dunseath GJ, Jones C, Eckstein ML, Williams DM, Hayes J, Pitt J, Bain SC, Moser O, Bracken RM. Extent and prevalence of post-exercise and nocturnal hypoglycemia following peri-exercise bolus insulin adjustments in individuals with type 1 diabetes. Nutr Metab Cardiovasc Dis 2021; 31:227-236. [PMID: 33012641 DOI: 10.1016/j.numecd.2020.07.043] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 07/28/2020] [Accepted: 07/29/2020] [Indexed: 10/23/2022]
Abstract
AIM To detail the extent and prevalence of post-exercise and nocturnal hypoglycemia following peri-exercise bolus insulin dose adjustments in individuals with type 1 diabetes (T1D) using multiple daily injections of insulins aspart (IAsp) and degludec (IDeg). METHODS AND RESULTS Sixteen individuals with T1D, completed a single-centred, randomised, four-period crossover trial consisting of 23-h inpatient phases. Participants administered either a regular (100%) or reduced (50%) dose (100%; 5.1 ± 2.4, 50%; 2.6 ± 1.2 IU, p < 0.001) of individualised IAsp 1 h before and after 45-min of evening exercise at 60 ± 6% V̇O2max. An unaltered dose of IDeg was administered in the morning. Metabolic, physiological and hormonal responses during exercise, recovery and nocturnal periods were characterised. The primary outcome was the number of trial day occurrences of hypoglycemia (venous blood glucose ≤ 3.9 mmol L -1). Inclusion of a 50% IAsp dose reduction strategy prior to evening exercise reduced the occurrence of in-exercise hypoglycemia (p = 0.023). Mimicking this reductive strategy in the post-exercise period decreased risk of nocturnal hypoglycemia (p = 0.045). Combining this strategy to reflect reductions either side of exercise resulted in higher glucose concentrations in the acute post-exercise (p = 0.034), nocturnal (p = 0.001), and overall (p < 0.001) periods. Depth of hypoglycemia (p = 0.302), as well as ketonic and counter-regulatory hormonal profiles were similar. CONCLUSIONS These findings demonstrate the glycemic safety of peri-exercise bolus dose reduction strategies in minimising the prevalence of acute and nocturnal hypoglycemia following evening exercise in people with T1D on MDI. Use of newer background insulins with current bolus insulins demonstrates efficacy and advances current recommendations for safe performance of exercise. CLINICAL TRIALS REGISTER DRKS00013509.
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Affiliation(s)
- Olivia McCarthy
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, SA1 8EN, UK.
| | - Rachel Deere
- Department for Health, University of Bath, Bath, BA2 7AY, UK
| | - Rachel Churm
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, SA1 8EN, UK
| | - Gareth J Dunseath
- Diabetes Research Group, Medical School, Swansea University, Swansea, SA2 8QA, UK
| | - Charlotte Jones
- Diabetes Research Group, Medical School, Swansea University, Swansea, SA2 8QA, UK
| | - Max L Eckstein
- Cardiovascular Diabetology Research Group, Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, 8036, Graz, Austria
| | - David M Williams
- Diabetes Research Group, Medical School, Swansea University, Swansea, SA2 8QA, UK
| | - Jennifer Hayes
- Diabetes Research Group, Medical School, Swansea University, Swansea, SA2 8QA, UK
| | - Jason Pitt
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, SA1 8EN, UK
| | - Stephen C Bain
- Diabetes Research Group, Medical School, Swansea University, Swansea, SA2 8QA, UK
| | - Othmar Moser
- Cardiovascular Diabetology Research Group, Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, 8036, Graz, Austria
| | - Richard M Bracken
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, SA1 8EN, UK
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9
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Glucose Control During Physical Activity and Exercise Using Closed Loop Technology in Adults and Adolescents with Type 1 Diabetes. Can J Diabetes 2020; 44:740-749. [DOI: 10.1016/j.jcjd.2020.06.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 05/28/2020] [Accepted: 06/01/2020] [Indexed: 12/13/2022]
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10
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Francescato MP, Ajčević M, Accardo A. Carbohydrate Requirement for Exercise in Type 1 Diabetes: Effects of Insulin Concentration. J Diabetes Sci Technol 2020; 14:1116-1121. [PMID: 30767503 PMCID: PMC7645145 DOI: 10.1177/1932296819826962] [Citation(s) in RCA: 5] [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: 12/16/2022]
Abstract
Physical activity is a keystone of a healthy lifestyle as well as of management of patients with type 1 diabetes. The risk of exercise-induced hypoglycemia, however, is a great challenge for these patients. The glycemic response to exercise depends upon several factors concerning the patient him/herself (eg, therapy, glycemic control, training level) and the characteristics of the exercise performed. Only in-depth knowledge of these factors will allow to develop individualized strategies minimizing the risk of hypoglycemia. The main factors affecting the exercise-induced hypoglycemia in patients with T1D have been analyzed, including the effects of insulin concentration. A model is discussed, which has the potential to become the basis for providing patients with individualized suggestions to keep constant glucose levels on each exercise occasion.
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Affiliation(s)
- Maria Pia Francescato
- Department of Medicine, University of Udine, Udine, Italy
- Maria Pia Francescato, MD, Department of Medicine, University of Udine, p. le M. Kolbe 4, 33100 Udine, Italy.
| | - Miloš Ajčević
- Department of Engineering and Architecture, University of Trieste, Trieste, Italy
| | - Agostino Accardo
- Department of Engineering and Architecture, University of Trieste, Trieste, Italy
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11
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McCarthy O, Eckstein ML, Scott SN, Fontana FY, Christiansen MP, Stettler C, Fisher M, Bode B, Riddell MC, Hayes C, Lagrou PL, Southerland P, Moser O, Bracken RM. Glycemic responses to strenuous training in male professional cyclists with type 1 diabetes: a prospective observational study. BMJ Open Diabetes Res Care 2020; 8:8/1/e001245. [PMID: 32303532 PMCID: PMC7199179 DOI: 10.1136/bmjdrc-2020-001245] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 03/12/2020] [Accepted: 03/24/2020] [Indexed: 01/25/2023] Open
Abstract
INTRODUCTION This prospective observational study sought to establish the glycemic, physiological and dietary demands of strenuous exercise training as part of a 9-day performance camp in a professional cycling team with type 1 diabetes (T1D). RESEARCH DESIGN AND METHODS Sixteen male professional cyclists with T1D on multiple daily injections (age: 27±4 years; duration of T1D: 11±5 years; body mass index: 22±2 kg/m2; glycated hemoglobin: 7%±1% (50±6 mmol/mol); maximum rate of oxygen consumption: 73±4 mL/kg/min) performed road cycle sessions (50%-90% of the anaerobic threshold, duration 1-6 hours) over 9 consecutive days. Glycemic (Dexcom G6), nutrition and physiological data were collected throughout. Glycemic data were stratified into predefined glycemic ranges and mapped alongside exercise physiology and nutritional parameters, as well as split into daytime and night-time phases for comparative analysis. Data were assessed by means of analysis of variance and paired t-tests. A p value of ≤0.05 (two-tailed) was statistically significant. RESULTS Higher levels of antecedent hypoglycemia in the nocturnal hours were associated with greater time spent in next-day hypoglycemia overall (p=0.003) and during exercise (p=0.019). Occurrence of nocturnal hypoglycemia was associated with over three times the risk of next-day hypoglycemia (p<0.001) and a twofold risk of low glucose during cycling (p<0.001). Moreover, there was trend for a greater amount of time spent in mild hypoglycemia during the night compared with daytime hours (p=0.080). CONCLUSION The higher prevalence of nocturnal hypoglycemia was associated with an increased risk of next-day hypoglycemia, which extended to cycle training sessions. These data highlight the potential need for additional prebed carbohydrates and/or insulin dose reduction strategies around exercise training in professional cyclists with T1D. TRIAL REGISTRATION NUMBER DRKS00019923.
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Affiliation(s)
- Olivia McCarthy
- Applied Sports, Technology, Exercise and Medicine, Swansea University, Swansea, West Glamorgan, UK
- Diabetes Research Group, Swansea University, Swansea, West Glamorgan, UK
| | - Max L Eckstein
- Cardiovascular Diabetology Research Group, Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Steiermark, Austria
| | - Sam N Scott
- Research Institute for Sport and Exercise Science, Liverpool John Moores University, Liverpool, UK
| | - Federico Y Fontana
- Department of Neurological and Movement Sciences, University of Verona, Verona, Veneto, Italy
- Team Novo Nordisk Professional Cycling Team, Atlanta, Georgia, USA
| | | | - Christoph Stettler
- Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | | | - Bruce Bode
- Department of Medicine, Emory University, Atlanta, Georgia, USA
| | - Michael C Riddell
- Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - Charlotte Hayes
- Team Novo Nordisk Professional Cycling Team, Atlanta, Georgia, USA
| | - Peter L Lagrou
- Team Novo Nordisk Academic and Clinical Advisors, Team Novo Nordisk Professional Cycling Team, Atlanta, Georgia, USA
| | - Phil Southerland
- Team Novo Nordisk Professional Cycling Team, Atlanta, Georgia, USA
| | - Othmar Moser
- Cardiovascular Diabetology Research Group, Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Steiermark, Austria
| | - Richard M Bracken
- Applied Sports, Technology, Exercise and Medicine, Swansea University, Swansea, West Glamorgan, UK
- Diabetes Research Group, Swansea University, Swansea, West Glamorgan, UK
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12
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Cockcroft EJ, Narendran P, Andrews RC. Exercise‐induced hypoglycaemia in type 1 diabetes. Exp Physiol 2020; 105:590-599. [DOI: 10.1113/ep088219] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 11/26/2019] [Indexed: 12/30/2022]
Affiliation(s)
| | - P. Narendran
- Department of DiabetesUniversity Hospitals Birmingham NHS Foundation Trust Birmingham UK
- Institute of Immunology and ImmunotherapyUniversity of Birmingham Birmingham UK
| | - R. C. Andrews
- University of Exeter Medical School Exeter UK
- Department of DiabetesTaunton and Somerset NHS Foundation Trust Taunton UK
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13
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Yardley JE. The Athlete with Type 1 Diabetes: Transition from Case Reports to General Therapy Recommendations. Open Access J Sports Med 2019; 10:199-207. [PMID: 31827338 PMCID: PMC6902845 DOI: 10.2147/oajsm.s149257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 11/27/2019] [Indexed: 12/03/2022] Open
Abstract
Fear of hypoglycemia is a common barrier to exercise and physical activity for individuals with type 1 diabetes. While some of the earliest studies in this area involved only one or two participants, the link between exercise, exogenous insulin, and hypoglycemia was already clear, with the only suggested management strategies being to decrease insulin dosage and/or consume carbohydrates before and after exercise. Over the past 50 years, a great deal of knowledge has been developed around the impact of different types and intensities of exercise on blood glucose levels in this population. Recent decades have also seen the development of technologies such as continuous glucose monitors, faster-acting insulins and commercially available insulin pumps to allow for the real-time observation of interstitial glucose levels, and more precise adjustments to insulin dosage before, during and after activity. As such, there are now evidence-based exercise and physical activity guidelines for individuals with type 1 diabetes. While the risk of hypoglycemia has not been completely eliminated, therapy recommendations have evolved considerably. This review discusses the evolution of the knowledge and the technology related to type 1 diabetes and exercise that have allowed this evolution to take place.
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Affiliation(s)
- Jane E Yardley
- Faculty of Kinesiology, Sport, and Recreation, University of Alberta, Edmonton, Canada.,Alberta Diabetes Institute, Edmonton, Canada.,Augustana Faculty, University of Alberta, Camrose, Canada.,Women's and Children's Research Institute, Edmonton, Canada
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14
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Carbohydrate Intake in the Context of Exercise in People with Type 1 Diabetes. Nutrients 2019; 11:nu11123017. [PMID: 31835538 PMCID: PMC6950062 DOI: 10.3390/nu11123017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 12/02/2019] [Accepted: 12/06/2019] [Indexed: 02/06/2023] Open
Abstract
Although the benefits of regular exercise on cardiovascular risk factors are well established for people with type 1 diabetes (T1D), glycemic control remains a challenge during exercise. Carbohydrate consumption to fuel the exercise bout and/or for hypoglycemia prevention is an important cornerstone to maintain performance and avoid hypoglycemia. The main strategies pertinent to carbohydrate supplementation in the context of exercise cover three aspects: the amount of carbohydrates ingested (i.e., quantity in relation to demands to fuel exercise and avoid hypoglycemia), the timing of the intake (before, during and after the exercise, as well as circadian factors), and the quality of the carbohydrates (encompassing differing carbohydrate types, as well as the context within a meal and the associated macronutrients). The aim of this review is to comprehensively summarize the literature on carbohydrate intake in the context of exercise in people with T1D.
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15
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Pre-Exercise Blood Glucose Levels Determine the Amount of Orally Administered Carbohydrates during Physical Exercise in Individuals with Type 1 Diabetes-A Randomized Cross-Over Trial. Nutrients 2019; 11:nu11061287. [PMID: 31174360 PMCID: PMC6627914 DOI: 10.3390/nu11061287] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 02/27/2019] [Accepted: 03/04/2019] [Indexed: 12/21/2022] Open
Abstract
The aim of the study was to assess the amount of orally administered carbohydrates needed to maintain euglycemia during moderate-intensity exercise in individuals with type 1 diabetes. Nine participants with type 1 diabetes (four women, age 32.1 ± 9.0 years, BMI 25.5 ± 3.9 kg/m2, HbA1c 55 ± 7 mmol/mol (7.2 ± 0.6%)) on insulin Degludec were randomized to cycle for 55 min at moderate intensity (63 ± 7% VO2peak) for five consecutive days on either 75% or 100% of their regular basal insulin dose. The impact of pre-exercise blood glucose concentration on the carbohydrate requirement was analyzed by one-way ANOVA stratified for pre-exercise blood glucose quartiles. The effect of the basal insulin dose on the amount of orally administered carbohydrates was evaluated by Wilcoxon matched-pairs signed-rank test. The amount of orally administered carbohydrates during the continuous exercise sessions was similar for both trial arms (75% or 100% basal insulin) with median [IQR] of 36 g (9–62 g) and 36 g (9–66 g) (p = 0.78). The amount of orally administered carbohydrates was determined by pre-exercise blood glucose concentration for both trial arms (p = 0.03). Our study elucidated the importance of pre-exercise glucose concentration related orally administered carbohydrates to maintain euglycemia during exercise in individuals with type 1 diabetes.
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16
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Scott SN, Anderson L, Morton JP, Wagenmakers AJM, Riddell MC. Carbohydrate Restriction in Type 1 Diabetes: A Realistic Therapy for Improved Glycaemic Control and Athletic Performance? Nutrients 2019; 11:E1022. [PMID: 31067747 PMCID: PMC6566372 DOI: 10.3390/nu11051022] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 04/30/2019] [Accepted: 05/03/2019] [Indexed: 12/13/2022] Open
Abstract
Around 80% of individuals with Type 1 diabetes (T1D) in the United States do not achieve glycaemic targets and the prevalence of comorbidities suggests that novel therapeutic strategies, including lifestyle modification, are needed. Current nutrition guidelines suggest a flexible approach to carbohydrate intake matched with intensive insulin therapy. These guidelines are designed to facilitate greater freedom around nutritional choices but they may lead to higher caloric intakes and potentially unhealthy eating patterns that are contributing to the high prevalence of obesity and metabolic syndrome in people with T1D. Low carbohydrate diets (LCD; <130 g/day) may represent a means to improve glycaemic control and metabolic health in people with T1D. Regular recreational exercise or achieving a high level of athletic performance is important for many living with T1D. Research conducted on people without T1D suggests that training with reduced carbohydrate availability (often termed "train low") enhances metabolic adaptation compared to training with normal or high carbohydrate availability. However, these "train low" practices have not been tested in athletes with T1D. This review aims to investigate the known pros and cons of LCDs as a potentially effective, achievable, and safe therapy to improve glycaemic control and metabolic health in people with T1D. Secondly, we discuss the potential for low, restricted, or periodised carbohydrate diets in athletes with T1D.
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Affiliation(s)
- Sam N Scott
- School of Kinesiology and Health Science, York University, Toronto, ON M3J 1P3, Canada.
| | | | - James P Morton
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK.
| | - Anton J M Wagenmakers
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, L3 3AF, UK.
| | - Michael C Riddell
- School of Kinesiology and Health Science, York University, Toronto, ON M3J 1P3, Canada.
- LMC Diabetes & Endocrinology, 1929 Bayview Avenue, Toronto, ON M4G 3E8, Canada.
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17
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McCarthy O, Bain SC, Deere R. Basal insulin reductions in anticipation of multiple exercise sessions in people with type 1 diabetes-a clinical perspective. ANNALS OF TRANSLATIONAL MEDICINE 2019; 6:S111. [PMID: 30740432 DOI: 10.21037/atm.2018.11.63] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Olivia McCarthy
- Diabetes Research Group Cymru, Medical School, Swansea University, Swansea, UK.,Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, UK
| | - Steve C Bain
- Diabetes Research Group Cymru, Medical School, Swansea University, Swansea, UK
| | - Rachel Deere
- Diabetes Research Group Cymru, Medical School, Swansea University, Swansea, UK.,Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, UK
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18
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McCarthy O, Moser O, Eckstein ML, Deere R, Bain SC, Pitt J, Bracken RM. Resistance Isn't Futile: The Physiological Basis of the Health Effects of Resistance Exercise in Individuals With Type 1 Diabetes. Front Endocrinol (Lausanne) 2019; 10:507. [PMID: 31428047 PMCID: PMC6688119 DOI: 10.3389/fendo.2019.00507] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 07/11/2019] [Indexed: 12/12/2022] Open
Abstract
The importance of regular exercise for glucose management in individuals with type 1 diabetes is magnified by its acknowledgment as a key adjunct to insulin therapy by several governmental, charitable, and healthcare organisations. However, although actively encouraged, exercise participation rates remain low, with glycaemic disturbances and poor cardiorespiratory fitness cited as barriers to long-term involvement. These fears are perhaps exacerbated by uncertainty in how different forms of exercise can considerably alter several acute and chronic physiological outcomes in those with type 1 diabetes. Thus, understanding the bodily responses to specific forms of exercise is important for the provision of practical guidelines that aim to overcome these exercise barriers. Currently, the majority of existing exercise research in type 1 diabetes has focused on moderate intensity continuous protocols with less work exploring predominately non-oxidative exercise modalities like resistance exercise. This is surprising, considering the known neuro-muscular, osteopathic, metabolic, and vascular benefits associated with resistance exercise in the wider population. Considering that individuals with type 1 diabetes have an elevated susceptibility for complications within these physiological systems, the wider health benefits associated with resistance exercise may help alleviate the prevalence and/or magnitude of pathological manifestation in this population group. This review outlines the health benefits of resistance exercise with reference to evidence in aiding some of the common complications associated with individuals with type 1 diabetes.
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Affiliation(s)
- Olivia McCarthy
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, United Kingdom
- Diabetes Research Group, Medical School, Swansea University, Swansea, United Kingdom
- *Correspondence: Olivia McCarthy
| | - Othmar Moser
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, United Kingdom
- Cardiovascular Diabetology Research Group, Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Max L. Eckstein
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, United Kingdom
- Cardiovascular Diabetology Research Group, Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Rachel Deere
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, United Kingdom
- Diabetes Research Group, Medical School, Swansea University, Swansea, United Kingdom
| | - Steve C. Bain
- Diabetes Research Group, Medical School, Swansea University, Swansea, United Kingdom
| | - Jason Pitt
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, United Kingdom
| | - Richard M. Bracken
- Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, United Kingdom
- Diabetes Research Group, Medical School, Swansea University, Swansea, United Kingdom
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19
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20
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Faria VCD, Lima LM, Pereira DAG. GLYCEMIC INDEX OF PRE-EXERCISE MEAL IN DIABETES MELLITUS: A SYSTEMATIC REVIEW. REV BRAS MED ESPORTE 2018. [DOI: 10.1590/1517-869220182405170370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ABSTRACT Physical exercise and diet quality are essential for glycemic control of diabetic patients, but consideration must be given to the risk of hypoglycemia in response to exercise. Therefore this study aims at 1) conducting a systematic review of the glycemic index (GI) of the pre-exercise meal and of glycemic behavior during and after aerobic exercise in diabetic subjects, and 2) discussing the safest and most appropriate pre-exercise nutritional guidance for this population. In accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA), two researchers independently undertook a systematic search. A third researcher participated in the selection of articles due to the presence of discrepancies. We selected two studies which both suggest that a low glycemic index (GI) meal is the best pre-exercise option, one of which suggests that the optimal time for food intake is 30 minutes before exercise. However, these results are not sufficient to define a clinical conduct, and other studies are needed to elucidate whether GI is a relevant parameter for pre- and post-exercise clinical monitoring of patients with diabetes mellitus (DM), particularly as regards to the different guidelines for type 1 and type 2 DM. Level of Evidence II; Prognostic Study.
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21
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Exercise Prescription in Patients with Different Combinations of Cardiovascular Disease Risk Factors: A Consensus Statement from the EXPERT Working Group. Sports Med 2018; 48:1781-1797. [DOI: 10.1007/s40279-018-0930-4] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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22
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Moser O, Tschakert G, Mueller A, Groeschl W, Pieber TR, Koehler G, Eckstein ML, Bracken RM, Hofmann P. Atypical blood glucose response to continuous and interval exercise in a person with type 1 diabetes: a case report. J Med Case Rep 2017; 11:176. [PMID: 28662684 PMCID: PMC5492928 DOI: 10.1186/s13256-017-1355-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/12/2017] [Indexed: 01/06/2023] Open
Abstract
Background Therapy must be adapted for people with type 1 diabetes to avoid exercise-induced hypoglycemia caused by increased exercise-related glucose uptake into muscles. Therefore, to avoid hypoglycemia, the preexercise short-acting insulin dose must be reduced for safety reasons. We report a case of a man with long-lasting type 1 diabetes in whom no blood glucose decrease during different types of exercise with varying exercise intensities and modes was found, despite physiological hormone responses. Case presentation A Caucasian man diagnosed with type 1 diabetes for 24 years performed three different continuous high-intensity interval cycle ergometer exercises as part of a clinical trial (ClinicalTrials.gov identifier NCT02075567). Intensities for both modes of exercises were set at 5% below and 5% above the first lactate turn point and 5% below the second lactate turn point. Short-acting insulin doses were reduced by 25%, 50%, and 75%, respectively. Measurements taken included blood glucose, blood lactate, gas exchange, heart rate, adrenaline, noradrenaline, cortisol, glucagon, and insulin-like growth factor-1. Unexpectedly, no significant blood glucose decreases were observed during all exercise sessions (start versus end, 12.97 ± 2.12 versus 12.61 ± 2.66 mmol L−1, p = 0.259). All hormones showed the expected response, dependent on the different intensities and modes of exercises. Conclusions People with type 1 diabetes typically experience a decrease in blood glucose levels, particularly during low- and moderate-intensity exercises. In our patient, we clearly found no decline in blood glucose, despite a normal hormone response and no history of any insulin insensitivity. This report indicates that there might be patients for whom the recommended preexercise therapy adaptation to avoid exercise-induced hypoglycemia needs to be questioned because this could increase the risk of severe hyperglycemia and ketosis.
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Affiliation(s)
- Othmar Moser
- Exercise Physiology, Training and Training Therapy Research Group, Institute of Sports Sciences, University of Graz, Graz, Austria. .,Division of Endocrinology and Metabolism, Department of Internal Medicine, Medical University of Graz, Graz, Austria. .,Diabetes Research Group, Medical School, Swansea University, Swansea, UK. .,Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, UK.
| | - Gerhard Tschakert
- Exercise Physiology, Training and Training Therapy Research Group, Institute of Sports Sciences, University of Graz, Graz, Austria
| | - Alexander Mueller
- Exercise Physiology, Training and Training Therapy Research Group, Institute of Sports Sciences, University of Graz, Graz, Austria.,Sports Science Laboratory, Institute of Health and Tourism Management, University of Applied Sciences-FH JOANNEUM, Bad Gleichenberg, Austria
| | - Werner Groeschl
- Exercise Physiology, Training and Training Therapy Research Group, Institute of Sports Sciences, University of Graz, Graz, Austria
| | - Thomas R Pieber
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Gerd Koehler
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Max L Eckstein
- Diabetes Research Group, Medical School, Swansea University, Swansea, UK.,Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, UK
| | - Richard M Bracken
- Diabetes Research Group, Medical School, Swansea University, Swansea, UK.,Applied Sport, Technology, Exercise and Medicine Research Centre (A-STEM), College of Engineering, Swansea University, Swansea, UK
| | - Peter Hofmann
- Exercise Physiology, Training and Training Therapy Research Group, Institute of Sports Sciences, University of Graz, Graz, Austria
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Riddell MC, Gallen IW, Smart CE, Taplin CE, Adolfsson P, Lumb AN, Kowalski A, Rabasa-Lhoret R, McCrimmon RJ, Hume C, Annan F, Fournier PA, Graham C, Bode B, Galassetti P, Jones TW, Millán IS, Heise T, Peters AL, Petz A, Laffel LM. Exercise management in type 1 diabetes: a consensus statement. Lancet Diabetes Endocrinol 2017; 5:377-390. [PMID: 28126459 DOI: 10.1016/s2213-8587(17)30014-1] [Citation(s) in RCA: 482] [Impact Index Per Article: 68.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 11/20/2016] [Accepted: 11/21/2016] [Indexed: 12/28/2022]
Abstract
Type 1 diabetes is a challenging condition to manage for various physiological and behavioural reasons. Regular exercise is important, but management of different forms of physical activity is particularly difficult for both the individual with type 1 diabetes and the health-care provider. People with type 1 diabetes tend to be at least as inactive as the general population, with a large percentage of individuals not maintaining a healthy body mass nor achieving the minimum amount of moderate to vigorous aerobic activity per week. Regular exercise can improve health and wellbeing, and can help individuals to achieve their target lipid profile, body composition, and fitness and glycaemic goals. However, several additional barriers to exercise can exist for a person with diabetes, including fear of hypoglycaemia, loss of glycaemic control, and inadequate knowledge around exercise management. This Review provides an up-to-date consensus on exercise management for individuals with type 1 diabetes who exercise regularly, including glucose targets for safe and effective exercise, and nutritional and insulin dose adjustments to protect against exercise-related glucose excursions.
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Affiliation(s)
- Michael C Riddell
- Muscle Health Research Centre, York University, Toronto, ON, Canada.
| | - Ian W Gallen
- Royal Berkshire NHS Foundation Trust Centre for Diabetes and Endocrinology, Royal Berkshire Hospital, Reading, UK
| | - Carmel E Smart
- Hunter Medical Research Institute, School of Health Sciences, University of Newcastle, Rankin Park, NSW, Australia
| | - Craig E Taplin
- Division of Endocrinology and Diabetes, Department of Pediatrics, University of Washington, Seattle Children's Hospital, Seattle, WA, USA
| | - Peter Adolfsson
- Department of Pediatrics, The Hospital of Halland, Kungsbacka, Sweden; Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Alistair N Lumb
- Oxford Centre for Diabetes, Endocrinology and Metabolism, Churchill Hospital, Oxford, UK
| | - Aaron Kowalski
- Juvenile Diabetes Research Foundation, New York, NY, USA
| | - Remi Rabasa-Lhoret
- Department of Nutrition and Institut de Recherches Cliniques de Montréal, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Rory J McCrimmon
- Division of Molecular and Clinical Medicine, School of Medicine, University of Dundee, Dundee, UK
| | | | - Francesca Annan
- Children and Young People's Diabetes Service, University College London Hospitals NHS Foundation Trust, London, UK
| | - Paul A Fournier
- School of Sport Science, Exercise, and Health, Perth, WA, Australia
| | | | - Bruce Bode
- Atlanta Diabetes Associates, Atlanta, GA, USA
| | - Pietro Galassetti
- Department of Pediatrics, University of California Irvine, Irvine, CA, USA; AstraZeneca, Gaithersburg, MD, USA
| | - Timothy W Jones
- The University of Western Australia, Perth, WA, Australia; Department of Endocrinology and Diabetes, Princess Margaret Hospital for Children, Perth, WA, Australia; Telethon Kids Institute, Perth, WA, Australia
| | - Iñigo San Millán
- Department of Physical Medicine and Rehabilitation, University of Colorado, School of Medicine, Aurora, CO, USA
| | | | - Anne L Peters
- Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | | | - Lori M Laffel
- Division of Endocrinology, Boston Children's Hospital, Boston, MA, USA; Pediatric, Adolescent and Young Adult Section, Joslin Diabetes Center, Boston, MA, USA
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24
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Low Glycemic Index Prototype Isomaltulose-Update of Clinical Trials. Nutrients 2017; 9:nu9040381. [PMID: 28406437 PMCID: PMC5409720 DOI: 10.3390/nu9040381] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 04/05/2017] [Accepted: 04/12/2017] [Indexed: 12/17/2022] Open
Abstract
Low glycemic index diets are supposed to achieve a more beneficial effect on blood glucose control in people with diabetes mellitus and may also provide metabolic benefits for the general population. A prototype of a low-glycemic index carbohydrate is the natural occurring disaccharide isomaltulose that can be commercially produced from sucrose (beet sugar) to industrial scale. It is currently used in various food and drink applications as well as special and clinical nutrition feeds and formula diet as a food ingredient and alternative sugar. Here we provide an overview on clinical trials with isomaltulose including an analysis of its effects on glycemia and fat oxidation as compared to high glycemic index sugars and carbohydrates. In addition, we discuss recent reports on beneficial effects in weight-loss maintenance and pregnancy.
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25
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Yardley JE, Colberg SR. Update on Management of Type 1 Diabetes and Type 2 Diabetes in Athletes. Curr Sports Med Rep 2017; 16:38-44. [PMID: 28067740 DOI: 10.1249/jsr.0000000000000327] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Optimal blood glucose management still remains the biggest challenge in active individuals with diabetes, particularly in insulin users, but some newer strategies have been introduced to maintain blood glucose control. Recent studies emphasize the importance of exercise intensity on glycemic balance. In individuals with type 1 and type 2 diabetes, both resistance and high-intensity intermittent exercise have been shown to confer beneficial physiological adaptations in training studies, while also showing acute glycemic benefits from single sessions. At the same time, anyone training at higher intensities also should take into consideration potential impairments in thermoregulation in individuals with diabetes, which can increase the risk of heat stress during exercise in hot and/or humid conditions. Recent studies of medication effects on electrolyte balance and hydration give a more complete picture of potential exercise risks for athletes with diabetes. Use of the latest diabetes-related technologies also may benefit the athlete with diabetes.
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Affiliation(s)
- Jane E Yardley
- 1Department of Social Sciences, University of Alberta, Augustana Faculty, Camrose, AB, CANADA; and 2Human Movement Sciences Department, Old Dominion University, Norfolk, VA
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Metabolic Effects of Glucose-Fructose Co-Ingestion Compared to Glucose Alone during Exercise in Type 1 Diabetes. Nutrients 2017; 9:nu9020164. [PMID: 28230765 PMCID: PMC5331595 DOI: 10.3390/nu9020164] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 02/09/2017] [Accepted: 02/15/2017] [Indexed: 12/15/2022] Open
Abstract
This paper aims to compare the metabolic effects of glucose-fructose co-ingestion (GLUFRU) with glucose alone (GLU) in exercising individuals with type 1 diabetes mellitus. Fifteen male individuals with type 1 diabetes (HbA1c 7.0% ± 0.6% (53 ± 7 mmol/mol)) underwent a 90 min iso-energetic continuous cycling session at 50% VO2max while ingesting combined glucose-fructose (GLUFRU) or glucose alone (GLU) to maintain stable glycaemia without insulin adjustment. GLUFRU and GLU were labelled with 13C-fructose and 13C-glucose, respectively. Metabolic assessments included measurements of hormones and metabolites, substrate oxidation, and stable isotopes. Exogenous carbohydrate requirements to maintain stable glycaemia were comparable between GLUFRU and GLU (p = 0.46). Fat oxidation was significantly higher (5.2 ± 0.2 vs. 2.6 ± 1.2 mg·kg−1·min−1, p < 0.001) and carbohydrate oxidation lower (18.1 ± 0.8 vs. 24.5 ± 0.8 mg·kg−1·min−1p < 0.001) in GLUFRU compared to GLU, with decreased muscle glycogen oxidation in GLUFRU (10.2 ± 0.9 vs. 17.5 ± 1.0 mg·kg−1·min−1, p < 0.001). Lactate levels were higher (2.2 ± 0.2 vs. 1.8 ± 0.1 mmol/L, p = 0.012) in GLUFRU, with comparable counter-regulatory hormones between GLUFRU and GLU (p > 0.05 for all). Glucose and insulin levels, and total glucose appearance and disappearance were comparable between interventions. Glucose-fructose co-ingestion may have a beneficial impact on fuel metabolism in exercising individuals with type 1 diabetes without insulin adjustment, by increasing fat oxidation whilst sparing glycogen.
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Short-Acting Insulin Reduction Strategies for Continuous Cycle Ergometer Exercises in Patients with Type 1 Diabetes Mellitus. Asian J Sports Med 2017. [DOI: 10.5812/asjsm.42160] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Strategies used by Patients with Type 1 Diabetes to Avoid Hypoglycemia in a 24×1-Hour Marathon: Comparison with the Amounts of Carbohydrates Estimated by a Customizable Algorithm. Can J Diabetes 2016; 41:184-189. [PMID: 27939876 DOI: 10.1016/j.jcjd.2016.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 09/05/2016] [Accepted: 09/21/2016] [Indexed: 12/28/2022]
Abstract
OBJECTIVES The preferred countermeasure to avoid exercise-related hypoglycemia was investigated in a group of patients with type 1 diabetes participating in a stressful event, a 24×1-hour relay marathon. The carbohydrates actually consumed were compared to those estimated for each patient by applying a customizable algorithm, Exercise Carbohydrates Requirement Estimating Software (ECRES), based on patient's usual therapy and diet and on the exercise characteristics. METHODS Glycemia was tested at the start, middle and end of the races. Usual therapies and diets and the adopted countermeasures were recorded in detail. RESULTS We studied 19 patients who walked/ran 10.4±2.8 km with a heart rate of 167±11 beats per minute. Of the 19 patients, 7 patients reduced the administered insulin (premeal bolus or basal infusion rate). Glycemia fell by the end of the races (p=0.006; median -1.8 mmol⋅L-1; interquartile range -0.4 mmol⋅L-1 to -5.3 mmol⋅L-1), despite 9 patients being hyperglycemic at the start. Of the patients, 14 concluded the race with glycemia on target, and 4 patients were hyperglycemic. Amounts of carbohydrates actually consumed (median 30 g; interquartile range 0 g to 71 g) were not significantly different from those estimated by ECRES (median 38 g; interquartile range 24 g to 68 g), the 2 quantities being significantly related (R=0.64; p=0.003). ECRES estimated lower carbohydrate levels (-13 g) than the amounts actually consumed by the 4 patients who concluded their exercises with hyperglycemia. CONCLUSIONS Patients preferred to consume extra carbohydrates to avoid the possible exercise-induced hypoglycemia. ECRES would provide satisfactory estimates of the carbohydrate requirements, even for a stressful condition, and almost equal to the quantities consumed following medical advice.
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Heise T, Bain SC, Bracken RM, Zijlstra E, Nosek L, Stender-Petersen K, Rabøl R, Rowe E, Haahr HL. Similar risk of exercise-related hypoglycaemia for insulin degludec to that for insulin glargine in patients with type 1 diabetes: a randomized cross-over trial. Diabetes Obes Metab 2016; 18:196-9. [PMID: 26450456 PMCID: PMC5063138 DOI: 10.1111/dom.12588] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 09/25/2015] [Accepted: 10/05/2015] [Indexed: 12/03/2022]
Abstract
We compared changes in blood glucose (BG) and risk of hypoglycaemia during and after exercise in 40 patients with type 1 diabetes (T1D) treated with insulin degludec (IDeg) or insulin glargine (IGlar) in a randomized, open-label, two-period, crossover trial. After individual titration and a steady-state period, patients performed 30 min of moderate-intensity cycle ergometer exercise (65% peak rate of oxygen uptake). BG, counter-regulatory hormones and hypoglycaemic episodes were measured frequently during and for 24 h after exercise. BG changes during exercise were similar with IDeg and IGlar [estimated treatment difference (ETD) for maximum BG decrease: 0.14 mmol/l; 95% confidence interval (CI) -0.15, 0.42; p = 0.34], as was mean BG (ETD -0.16 mmol/l; 95% CI -0.36, 0.05; p = 0.13). No hypoglycaemic episodes occurred during exercise. Post-exercise mean BG, counter-regulatory hormone response and number of hypoglycaemic episodes in 24 h after starting exercise were similar with IDeg (18 events in 13 patients) and IGlar (23 events in 15 patients). This clinical trial showed that, in patients with T1D treated with a basal-bolus regimen, the risk of hypoglycaemia induced by moderate-intensity exercise was low with IDeg and similar to that with IGlar.
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Affiliation(s)
| | - S C Bain
- Diabetes and Endocrinology Department, Swansea University, Swansea, UK
| | - R M Bracken
- Diabetes and Endocrinology Department, Swansea University, Swansea, UK
| | | | | | | | - R Rabøl
- Novo Nordisk A/S, Søborg, Denmark
| | - E Rowe
- Novo Nordisk Inc., Plainsboro, NJ, USA
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Campbell MD, Walker M, Bracken RM, Turner D, Stevenson EJ, Gonzalez JT, Shaw JA, West DJ. Insulin therapy and dietary adjustments to normalize glycemia and prevent nocturnal hypoglycemia after evening exercise in type 1 diabetes: a randomized controlled trial. BMJ Open Diabetes Res Care 2015; 3:e000085. [PMID: 26019878 PMCID: PMC4442134 DOI: 10.1136/bmjdrc-2015-000085] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Revised: 03/10/2015] [Accepted: 03/17/2015] [Indexed: 12/22/2022] Open
Abstract
INTRODUCTION Evening-time exercise is a frequent cause of severe hypoglycemia in type 1 diabetes, fear of which deters participation in regular exercise. Recommendations for normalizing glycemia around exercise consist of prandial adjustments to bolus insulin therapy and food composition, but this carries only short-lasting protection from hypoglycemia. Therefore, this study aimed to examine the impact of a combined basal-bolus insulin dose reduction and carbohydrate feeding strategy on glycemia and metabolic parameters following evening exercise in type 1 diabetes. METHODS Ten male participants (glycated hemoglobin: 52.4±2.2 mmol/mol), treated with multiple daily injections, completed two randomized study-days, whereby administration of total daily basal insulin dose was unchanged (100%), or reduced by 20% (80%). Participants attended the laboratory at ∼08:00 h for a fasted blood sample, before returning in the evening. On arrival (∼17:00 h), participants consumed a carbohydrate meal and administered a 75% reduced rapid-acting insulin dose and 60 min later performed 45 min of treadmill running. At 60 min postexercise, participants consumed a low glycemic index (LGI) meal and administered a 50% reduced rapid-acting insulin dose, before returning home. At ∼23:00 h, participants consumed a LGI bedtime snack and returned to the laboratory the following morning (∼08:00 h) for a fasted blood sample. Venous blood samples were analyzed for glucose, glucoregulatory hormones, non-esterified fatty acids, β-hydroxybutyrate, interleukin 6, and tumor necrosis factor α. Interstitial glucose was monitored for 24 h pre-exercise and postexercise. RESULTS Glycemia was similar until 6 h postexercise, with no hypoglycemic episodes. Beyond 6 h glucose levels fell during 100%, and nine participants experienced nocturnal hypoglycemia. Conversely, all participants during 80% were protected from nocturnal hypoglycemia, and remained protected for 24 h postexercise. All metabolic parameters were similar. CONCLUSIONS Reducing basal insulin dose with reduced prandial bolus insulin and LGI carbohydrate feeding provides protection from hypoglycemia during and for 24 h following evening exercise. This strategy is not associated with hyperglycemia, or adverse metabolic disturbances. CLINICAL TRIALS NUMBER NCT02204839, ClinicalTrials.gov.
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Affiliation(s)
- Matthew D Campbell
- Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, UK
| | - Mark Walker
- Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, UK
| | - Richard M Bracken
- Diabetes Research Group, College of Medicine, Swansea University, Swansea, UK
| | - Daniel Turner
- Diabetes Research Group, College of Medicine, Swansea University, Swansea, UK
| | - Emma J Stevenson
- Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, UK
| | - Javier T Gonzalez
- Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, UK
| | - James A Shaw
- Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, UK
| | - Daniel J West
- Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, UK
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Abstract
While being physically active bestows many health benefits on individuals with type 1 diabetes, their overall blood glucose control is not enhanced without an effective balance of insulin dosing and food intake to maintain euglycemia before, during, and after exercise of all types. At present, a number of technological advances are already available to insulin users who desire to be physically active with optimal blood glucose control, although a number of limitations to those devices remain. In addition to continued improvements to existing technologies and introduction of new ones, finding ways to integrate all of the available data to optimize blood glucose control and performance during and following exercise will likely involve development of "smart" calculators, enhanced closed-loop systems that are able to use additional inputs and learn, and social aspects that allow devices to meet the needs of the users.
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Affiliation(s)
- Sheri R Colberg
- Human Movement Sciences Department, Old Dominion University, Norfolk, VA, USA
| | - Remmert Laan
- William Sansum Diabetes Center, Santa Barbara, CA, USA
| | - Eyal Dassau
- Department of Chemical Engineering, University of California, Santa Barbara, CA, USA
| | - David Kerr
- William Sansum Diabetes Center, Santa Barbara, CA, USA
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Prolonged exercise in type 1 diabetes: performance of a customizable algorithm to estimate the carbohydrate supplements to minimize glycemic imbalances. PLoS One 2015; 10:e0125220. [PMID: 25918842 PMCID: PMC4412669 DOI: 10.1371/journal.pone.0125220] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 03/22/2015] [Indexed: 01/11/2023] Open
Abstract
Physical activity in patients with type 1 diabetes (T1DM) is hindered because of the high risk of glycemic imbalances. A recently proposed algorithm (named Ecres) estimates well enough the supplemental carbohydrates for exercises lasting one hour, but its performance for prolonged exercise requires validation. Nine T1DM patients (5M/4F; 35–65 years; HbA1c 54±13 mmol·mol-1) performed, under free-life conditions, a 3-h walk at 30% heart rate reserve while insulin concentrations, whole-body carbohydrate oxidation rates (determined by indirect calorimetry) and supplemental carbohydrates (93% sucrose), together with glycemia, were measured every 30 min. Data were subsequently compared with the corresponding values estimated by the algorithm. No significant difference was found between the estimated insulin concentrations and the laboratory-measured values (p = NS). Carbohydrates oxidation rate decreased significantly with time (from 0.84±0.31 to 0.53±0.24 g·min-1, respectively; p<0.001), being estimated well enough by the algorithm (p = NS). Estimated carbohydrates requirements were practically equal to the corresponding measured values (p = NS), the difference between the two quantities amounting to –1.0±6.1 g, independent of the elapsed exercise time (time effect, p = NS). Results confirm that Ecres provides a satisfactory estimate of the carbohydrates required to avoid glycemic imbalances during moderate intensity aerobic physical activity, opening the prospect of an intriguing method that could liberate patients from the fear of exercise-induced hypoglycemia.
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Charlton J, Kilbride L, MacLean R, Darlison MG, McKnight J. Delayed hypoglycaemia in people with type 1 diabetes after performing moderate intensity exercise before the evening meal. PRACTICAL DIABETES 2015. [DOI: 10.1002/pdi.1933] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jacqui Charlton
- Metabolic Unit; Western General Hospital, Edinburgh; Edinburgh Napier University; UK
| | | | - Rory MacLean
- Sighthill Campus; Edinburgh Napier University; Edinburgh UK
| | | | - John McKnight
- Metabolic Unit; Western General Hospital; Edinburgh UK
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Charlton J, Kilbride L, MacLean R, Darlison MG, McKnight J. The design and evaluation of a self-management algorithm for people with type 1 diabetes performing moderate intensity exercise. PRACTICAL DIABETES 2015. [DOI: 10.1002/pdi.1926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jacqui Charlton
- Metabolic Unit, Western General Hospital, Edinburgh; Edinburgh Napier University; UK
| | | | - Rory MacLean
- Sighthill Campus; Edinburgh Napier University; Edinburgh UK
| | - Mark G Darlison
- Life and Social Sciences; Sighthill Campus, Edinburgh Napier University; Edinburgh UK
| | - John McKnight
- Metabolic Unit; Western General Hospital; Edinburgh UK
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Campbell MD, Gonzalez JT, Rumbold PLS, Walker M, Shaw JA, Stevenson EJ, West DJ. Comparison of appetite responses to high- and low-glycemic index postexercise meals under matched insulinemia and fiber in type 1 diabetes. Am J Clin Nutr 2015; 101:478-86. [PMID: 25733632 DOI: 10.3945/ajcn.114.097162] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Patients with type 1 diabetes face heightened risk of hypoglycemia after exercise. Subsequent overfeeding, as a preventative measure against hypoglycemia, negates the energy deficit after exercise. Patients are also required to reduce the insulin dose administered with postexercise foods to further combat hypoglycemia. However, the insulin dose is dictated solely by the carbohydrate content, even though postprandial glycemia is vastly influenced by glycemic index (GI). With a need to control the postexercise energy balance, appetite responses after meals differing in GI are of particular interest. OBJECTIVES We assessed the appetite response to low-glycemic index (LGI) and high-glycemic index (HGI) postexercise meals in type 1 diabetes patients. This assessment also offered us the opportunity to evaluate the influence of GI on appetite responses independently of insulinemia, which confounds findings in individuals without diabetes. DESIGN Ten physically active men with type 1 diabetes completed 2 trials in a randomized crossover design. After 45 min of treadmill exercise at 70% of the peak oxygen uptake, participants consumed an LGI (GI ∼37) or HGI (GI ∼92) meal with a matched macronutrient composition, negligible fiber content, and standardized insulin-dose administration. The postprandial appetite response was determined for 180 min postmeal. During this time, circulating glucose, insulin, glucagon, and glucagon-like peptide-1 (GLP-1) concentrations and subjective appetite ratings were determined. RESULTS The HGI meal produced an ∼60% greater postprandial glucose area under the curve (AUC) than did the LGI meal (P = 0.008). Insulin, glucagon, and GLP-1 did not significantly differ between trials (P > 0.05). The fullness AUC was ∼25% greater after the HGI meal than after the LGI meal (P < 0.001), whereas hunger sensations were ∼9% lower after the HGI meal than after the LGI meal (P = 0.001). CONCLUSION Under conditions of matched insulinemia and fiber, an HGI postexercise meal suppresses feelings of hunger and augments postprandial fullness sensations more so than an otherwise equivalent LGI meal in type 1 diabetes patients.
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Affiliation(s)
- Matthew D Campbell
- From the Department of Sport, Exercise and Rehabilitation (MDC, JTG, PLSR, DJW, and EJS) and the Brain, Performance and Nutrition Research Centre (JTG and EJS), Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom, and the Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom (MW and JAS)
| | - Javier T Gonzalez
- From the Department of Sport, Exercise and Rehabilitation (MDC, JTG, PLSR, DJW, and EJS) and the Brain, Performance and Nutrition Research Centre (JTG and EJS), Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom, and the Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom (MW and JAS)
| | - Penny L S Rumbold
- From the Department of Sport, Exercise and Rehabilitation (MDC, JTG, PLSR, DJW, and EJS) and the Brain, Performance and Nutrition Research Centre (JTG and EJS), Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom, and the Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom (MW and JAS)
| | - Mark Walker
- From the Department of Sport, Exercise and Rehabilitation (MDC, JTG, PLSR, DJW, and EJS) and the Brain, Performance and Nutrition Research Centre (JTG and EJS), Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom, and the Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom (MW and JAS)
| | - James A Shaw
- From the Department of Sport, Exercise and Rehabilitation (MDC, JTG, PLSR, DJW, and EJS) and the Brain, Performance and Nutrition Research Centre (JTG and EJS), Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom, and the Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom (MW and JAS)
| | - Emma J Stevenson
- From the Department of Sport, Exercise and Rehabilitation (MDC, JTG, PLSR, DJW, and EJS) and the Brain, Performance and Nutrition Research Centre (JTG and EJS), Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom, and the Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom (MW and JAS)
| | - Daniel J West
- From the Department of Sport, Exercise and Rehabilitation (MDC, JTG, PLSR, DJW, and EJS) and the Brain, Performance and Nutrition Research Centre (JTG and EJS), Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom, and the Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom (MW and JAS)
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Quantifying the Acute Changes in Glucose with Exercise in Type 1 Diabetes: A Systematic Review and Meta-Analysis. Sports Med 2015; 45:587-99. [DOI: 10.1007/s40279-015-0302-2] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Campbell MD, Walker M, Trenell MI, Stevenson EJ, Turner D, Bracken RM, Shaw JA, West DJ. A low-glycemic index meal and bedtime snack prevents postprandial hyperglycemia and associated rises in inflammatory markers, providing protection from early but not late nocturnal hypoglycemia following evening exercise in type 1 diabetes. Diabetes Care 2014; 37:1845-53. [PMID: 24784832 DOI: 10.2337/dc14-0186] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To examine the influence of the glycemic index (GI) of foods consumed after evening exercise on postprandial glycemia, metabolic and inflammatory markers, and nocturnal glycemic control in type 1 diabetes. RESEARCH DESIGN AND METHODS On two evenings (∼1700 h), 10 male patients (27 ± 5 years of age, HbA1c 6.7 ± 0.7% [49.9 ± 8.1 mmol/mol]) were administered a 25% rapid-acting insulin dose with a carbohydrate bolus 60 min before 45 min of treadmill running. At 60 min postexercise, patients were administered a 50% rapid-acting insulin dose with one of two isoenergetic meals (1.0 g carbohdyrate/kg body mass [BM]) matched for macronutrient content but of either low GI (LGI) or high GI (HGI). At 180 min postmeal, the LGI group ingested an LGI snack and the HGI group an HGI snack (0.4 g carbohdyrate/kg BM) before returning home (∼2300 h). Interval samples were analyzed for blood glucose and lactate; plasma glucagon, epinephrine, interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α); and serum insulin, cortisol, nonesterified fatty acid, and β-hydroxybutyrate concentrations. Interstitial glucose was recorded for 20 h postlaboratory attendance through continuous glucose monitoring. RESULTS Following the postexercise meal, an HGI snack induced hyperglycemia in all patients (mean ± SD glucose 13.5 ± 3.3 mmol/L) and marked increases in TNF-α and IL-6, whereas relative euglycemia was maintained with an LGI snack (7.7 ± 2.5 mmol/L, P < 0.001) without inflammatory cytokine elevation. Both meal types protected all patients from early hypoglycemia. Overnight glycemia was comparable, with a similar incidence of nocturnal hypoglycemia (n = 5 for both HGI and LGI). CONCLUSIONS Consuming LGI food with a reduced rapid-acting insulin dose following evening exercise prevents postprandial hyperglycemia and inflammation and provides hypoglycemia protection for ∼8 h postexercise; however, the risk of late nocturnal hypoglycemia remains.
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Affiliation(s)
- Matthew D Campbell
- Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, U.K
| | - Mark Walker
- Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, U.K
| | - Michael I Trenell
- Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, U.K
| | - Emma J Stevenson
- Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, U.K
| | - Daniel Turner
- Applied Sports, Technology, Exercise and Medicine Research Centre, College of Engineering, Swansea University, Swansea, U.K
| | - Richard M Bracken
- Applied Sports, Technology, Exercise and Medicine Research Centre, College of Engineering, Swansea University, Swansea, U.K
| | - James A Shaw
- Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, U.K
| | - Daniel J West
- Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, U.K.
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Campbell MD, Walker M, Trenell MI, Luzio S, Dunseath G, Tuner D, Bracken RM, Bain SC, Russell M, Stevenson EJ, West DJ. Metabolic implications when employing heavy pre- and post-exercise rapid-acting insulin reductions to prevent hypoglycaemia in type 1 diabetes patients: a randomised clinical trial. PLoS One 2014; 9:e97143. [PMID: 24858952 PMCID: PMC4032262 DOI: 10.1371/journal.pone.0097143] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Accepted: 04/14/2014] [Indexed: 12/13/2022] Open
Abstract
Aim To examine the metabolic, gluco-regulatory-hormonal and inflammatory cytokine responses to large reductions in rapid-acting insulin dose administered prandially before and after intensive running exercise in male type 1 diabetes patients. Methods This was a single centre, randomised, controlled open label study. Following preliminary testing, 8 male patients (24±2 years, HbA1c 7.7±0.4%/61±4 mmol.l−1) treated with insulin's glargine and aspart, or lispro attended the laboratory on two mornings at ∼08:00 h and consumed a standardised breakfast carbohydrate bolus (1 g carbohydrate.kg−1BM; 380±10 kcal) and self-administered a 75% reduced rapid-acting insulin dose 60 minutes before 45 minutes of intensive treadmill running at 73.1±0.9% VO2peak. At 60 minutes post-exercise, patients ingested a meal (1 g carbohydrate.kg−1BM; 660±21 kcal) and administered either a Full or 50% reduced rapid-acting insulin dose. Blood glucose and lactate, serum insulin, cortisol, non-esterified-fatty-acids, β-Hydroxybutyrate, and plasma glucagon, adrenaline, noradrenaline, IL-6, and TNF-α concentrations were measured for 180 minutes post-meal. Results All participants were analysed. All glycaemic, metabolic, hormonal, and cytokine responses were similar between conditions up to 60 minutes following exercise. Following the post-exercise meal, serum insulin concentrations were lower under 50% (p<0.05) resulting in 75% of patients experiencing hyperglycaemia (blood glucose ≥8.0 mmol.l−1; 50% n = 6, Full n = 3). β-Hydroxybutyrate concentrations decreased similarly, such that at 180 minutes post-meal concentrations were lower than rest under Full and 50%. IL-6 and TNF-α concentrations remained similar to fasting levels under 50% but declined under Full. Under 50% IL-6 concentrations were inversely related with serum insulin concentrations (r = −0.484, p = 0.017). Conclusions Heavily reducing rapid-acting insulin dose with a carbohydrate bolus before, and a meal after intensive running exercise may cause hyperglycaemia, but does not augment ketonaemia, raise inflammatory cytokines TNF-α and IL-6 above fasting levels, or cause other adverse metabolic or hormonal disturbances. Trial Registration ClinicalTrials.gov NCT01531855
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Affiliation(s)
- Matthew D Campbell
- Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom
| | - Mark Walker
- Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom
| | - Michael I Trenell
- Institute for Ageing and Health, Faculty of Medicine, Newcastle University, Newcastle-upon-Tyne, United Kingdom
| | - Steven Luzio
- Diabetes Research Group, College of Medicine, Swansea University Swansea, United Kingdom
| | - Gareth Dunseath
- Diabetes Research Group, College of Medicine, Swansea University Swansea, United Kingdom
| | - Daniel Tuner
- Applied Sports, Technology, Exercise and Medicine Research Centre, College of Engineering, Swansea University, Swansea, United Kingdom
| | - Richard M Bracken
- Applied Sports, Technology, Exercise and Medicine Research Centre, College of Engineering, Swansea University, Swansea, United Kingdom
| | - Stephen C Bain
- Diabetes Research Group, College of Medicine, Swansea University Swansea, United Kingdom
| | - Mark Russell
- Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom
| | - Emma J Stevenson
- Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom
| | - Daniel J West
- Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, United Kingdom
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Campbell MD, West DJ, Bain SC, Kingsley MIC, Foley P, Kilduff L, Turner D, Gray B, Stephens JW, Bracken RM. Simulated games activity vs continuous running exercise: a novel comparison of the glycemic and metabolic responses in T1DM patients. Scand J Med Sci Sports 2014; 25:216-22. [PMID: 24593125 DOI: 10.1111/sms.12192] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/14/2014] [Indexed: 11/30/2022]
Abstract
To compare the glycemic and metabolic responses to simulated intermittent games activity and continuous running exercise in type 1 diabetes. Nine patients (seven male, two female; 35 ± 4 years; HbA1c 8.1 ± 0.2%/65 ± 2 mmol/mol) treated on a basal-bolus regimen completed two main trials, a continuous treadmill run (CON) or an intermittent running protocol (INT). Patients arrived to the laboratory fasted at ∼ 08:00 h, replicating their usual pre-exercise meal and administering a 50% reduced dose of rapid-acting insulin before exercising. Blood glucose (BG), K(+) , Na(++) , pH, triglycerides, serum cortisol and NEFA were measured at baseline and for 60 min post-exercise. Interstitial glucose was measured for a further 23 h under free-living conditions. Following exercise, BG declined under both conditions but was less under INT (INT -1.1 ± 1.4 vs CON -5.3 ± 0.4 mmol/L, P = 0.037), meaning more patients experienced hypoglycemia (BG ≤ 3.5 mmol/L; CON n = 3 vs INT n = 2) but less hyperglycemia (BG ≥ 10.9 mmol/L; CON n = 0 vs INT n = 6) under CON. Blood lactate was significantly greater, and pH lower, with a temporal delay in K(+) under INT (P < 0.05). No conditional differences were observed in other measures during this time, or in interstitial glucose concentrations during the remaining 23 h after exercise. Simulated games activity carries a lower risk of early, but not late-onset hypoglycemia than continuous running exercise in type 1 diabetes.
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Affiliation(s)
- M D Campbell
- Department of Sport, Exercise and Rehabilitation, Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne, UK
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Shin YH, Jung HL, Ryu JW, Kim PS, Ha TY, An JY, Kang HY. Effects of a Pre-Exercise Meal on Plasma Growth Hormone Response and Fat Oxidation during Walking. Prev Nutr Food Sci 2014; 18:175-80. [PMID: 24471129 PMCID: PMC3892495 DOI: 10.3746/pnf.2013.18.3.175] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 08/23/2013] [Indexed: 01/20/2023] Open
Abstract
The purpose of this study was to determine the effects of a pre-exercise meal on the plasma human growth hormone (hGH) response and fat oxidation during walking. Subjects (n=8) were randomly provided with either 1 g/kg body weight of glucose in 200 mL water (CHO) or 200 mL water alone (CON) 30 min prior to exercise and subsequently walked on a treadmill at 50% of VO2max for 60 min. Plasma hGH concentrations were significantly higher in subjects who received CHO compared to those who received CON at 15 and 30 min. The fat oxidation rate in the CHO was significantly lower than the CON while walking for 5~15, 25~35 and 45~55 min. Plasma FFA levels were also significantly lower in the CHO compared to the CON at 30, 45 and 60 min. Plasma glucose levels in the CHO were significantly lower while plasma insulin levels were significantly higher than in the CON at 15 and 30 min. Therefore, the results of this study suggest that the elevation of plasma hGH levels due to the intake of a pre-exercise meal may not be strongly related to fat oxidation and plasma free fatty acid (FFA) levels during low-intensity exercise.
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Affiliation(s)
- Young-Ho Shin
- Exercise Metabolism Laboratory, Kyungpook National University, Daegu 702-701, Korea
| | - Hyun-Lyung Jung
- Exercise Metabolism Laboratory, Kyungpook National University, Daegu 702-701, Korea
| | - Jong-Woo Ryu
- Exercise Metabolism Laboratory, Kyungpook National University, Daegu 702-701, Korea
| | - Pan-Soo Kim
- Department of Judo, Yong In University, Gyeonggi 449-714, Korea
| | - Tae-Yeol Ha
- Division of Metabolism and Functionality Research, Korea Food Research Institute, Gyeonggi 463-746, Korea
| | - Ji-Yoon An
- Division of Metabolism and Functionality Research, Korea Food Research Institute, Gyeonggi 463-746, Korea
| | - Ho-Youl Kang
- Exercise Metabolism Laboratory, Kyungpook National University, Daegu 702-701, Korea
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Campbell MD, Walker M, Trenell MI, Jakovljevic DG, Stevenson EJ, Bracken RM, Bain SC, West DJ. Large pre- and postexercise rapid-acting insulin reductions preserve glycemia and prevent early- but not late-onset hypoglycemia in patients with type 1 diabetes. Diabetes Care 2013; 36:2217-24. [PMID: 23514728 PMCID: PMC3714511 DOI: 10.2337/dc12-2467] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To examine the acute and 24-h glycemic responses to reductions in postexercise rapid-acting insulin dose in type 1 diabetic patients. RESEARCH DESIGN AND METHODS After preliminary testing, 11 male patients (24 ± 2 years, HbA1c 7.7 ± 0.3%; 61 ± 3.4 mmol/mol) attended the laboratory on three mornings. Patients consumed a standardized breakfast (1 g carbohydrate · kg(-1) BM; 380 ± 10 kcal) and self-administered a 25% rapid-acting insulin dose 60 min prior to performing 45 min of treadmill running at 72.5 ± 0.9% VO2peak. At 60 min postexercise, patients ingested a meal (1 g carbohydrate · kg(-1) BM; 660 ± 21 kcal) and administered a Full, 75%, or 50% rapid-acting insulin dose. Blood glucose concentrations were measured for 3 h postmeal. Interstitial glucose was recorded for 20 h after leaving the laboratory using a continuous glucose monitoring system. RESULTS All glycemic responses were similar across conditions up to 60 min postexercise. After the postexercise meal, blood glucose was preserved under 50%, but declined under Full and 75%. Thence at 3 h, blood glucose was highest under 50% (50% [10.4 ± 1.2] vs. Full [6.2 ± 0.7] and 75% [7.6 ± 1.2 mmol · L(-1)], P = 0.029); throughout this period, all patients were protected against hypoglycemia under 50% (blood glucose ≤ 3.9; Full, n = 5; 75%, n = 2; 50%, n = 0). Fifty percent continued to protect patients against hypoglycemia for a further 4 h under free-living conditions. However, late-evening and nocturnal glycemia were similar; as a consequence, late-onset hypoglycemia was experienced under all conditions. CONCLUSIONS A 25% pre-exercise and 50% postexercise rapid-acting insulin dose preserves glycemia and protects patients against early-onset hypoglycemia (≤ 8 h). However, this strategy does not protect against late-onset postexercise hypoglycemia.
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Tonoli C, Heyman E, Roelands B, Buyse L, Cheung SS, Berthoin S, Meeusen R. Effects of different types of acute and chronic (training) exercise on glycaemic control in type 1 diabetes mellitus: a meta-analysis. SPORTS MEDICINE (AUCKLAND, N.Z.) 2013. [PMID: 23134339 DOI: 10.2165/11635380-000000000-00000] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
OBJECTIVE Exercise has been accepted and generally recommended for the management of type 1 diabetes mellitus (T1D) and for improving the overall quality of life in affected individuals. This meta-analysis was conducted to determine the overall effects of exercise (acute bouts of exercise and chronic exercise [or training]) on acute and chronic glycaemic control in patients with T1D, the effects of different types of exercise on glycaemic control and which conditions are required to obtain these positive effects. METHODS PubMed, ISI Web of Knowledge and SPORTDiscus™ were consulted to identify studies on T1D and exercise. Cohen's d statistics were used for calculating mean effect sizes (ES) as follows: small d = 0.3, medium d = 0.5 and large d = 0.8. Ninety-five percent confidence intervals (95% CIs) were used to establish the significance of our findings. RESULTS From a total of 937 studies, 33 that met the inclusion criteria were selected. Nine studies were used to calculate the ES of a single bout of aerobic exercise; 13 studies to calculate the ES of aerobic training; 2 studies to calculate the ES of strength training; 4 studies to calculate the ES of combined (aerobic and strength) training and 6 studies to calculate the ES of high-intensity exercise (HIE) and training. ES for exercise on acute glycaemic control were large, while they were small for chronic glycaemic control. Aerobic exercise, resistance exercise, mixed exercise (aerobic combined with resistance training) and HIE acutely decreased blood glucose levels. To prevent late-onset hypoglycaemic episodes, the use of single bouts of sprints into an aerobic exercise can be recommended. This meta-analysis also showed that a regular exercise training programme has a significant effect on acute and chronic glycaemic control, although not all exercise forms showed significant results. Specifically, aerobic training is a favourable tool for decreasing chronic glycaemic control, while resistance training, mixed and HIE did not significantly improve chronic glycaemic control. Although, this meta-analysis showed there was a tendency for improvement in glycaemic control due to resistance training or resistance training combined with endurance training, there were not enough studies and/or subjects to confirm this statistically. CONCLUSIONS Based on this meta-analysis, we can conclude that the addition of brief bouts of high-intensity, sprint-type exercise to aerobic exercise can minimize the risk of sustaining a hypoglycaemic episode. We can also conclude that only regular aerobic training will improve the glycated haemoglobin level of a patient with T1D.
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Affiliation(s)
- Cajsa Tonoli
- Human Physiology and Sports Medicine, Faculty of Physical Education and Physical Therapy, Vrije Universiteit Brussel, Brussels, Belgium
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Tonoli C, Heyman E, Roelands B, Buyse L, Cheung SS, Berthoin S, Meeusen R. Effects of different types of acute and chronic (training) exercise on glycaemic control in type 1 diabetes mellitus: a meta-analysis. Sports Med 2013; 42:1059-80. [PMID: 23134339 DOI: 10.1007/bf03262312] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Exercise has been accepted and generally recommended for the management of type 1 diabetes mellitus (T1D) and for improving the overall quality of life in affected individuals. This meta-analysis was conducted to determine the overall effects of exercise (acute bouts of exercise and chronic exercise [or training]) on acute and chronic glycaemic control in patients with T1D, the effects of different types of exercise on glycaemic control and which conditions are required to obtain these positive effects. METHODS PubMed, ISI Web of Knowledge and SPORTDiscus™ were consulted to identify studies on T1D and exercise. Cohen's d statistics were used for calculating mean effect sizes (ES) as follows: small d = 0.3, medium d = 0.5 and large d = 0.8. Ninety-five percent confidence intervals (95% CIs) were used to establish the significance of our findings. RESULTS From a total of 937 studies, 33 that met the inclusion criteria were selected. Nine studies were used to calculate the ES of a single bout of aerobic exercise; 13 studies to calculate the ES of aerobic training; 2 studies to calculate the ES of strength training; 4 studies to calculate the ES of combined (aerobic and strength) training and 6 studies to calculate the ES of high-intensity exercise (HIE) and training. ES for exercise on acute glycaemic control were large, while they were small for chronic glycaemic control. Aerobic exercise, resistance exercise, mixed exercise (aerobic combined with resistance training) and HIE acutely decreased blood glucose levels. To prevent late-onset hypoglycaemic episodes, the use of single bouts of sprints into an aerobic exercise can be recommended. This meta-analysis also showed that a regular exercise training programme has a significant effect on acute and chronic glycaemic control, although not all exercise forms showed significant results. Specifically, aerobic training is a favourable tool for decreasing chronic glycaemic control, while resistance training, mixed and HIE did not significantly improve chronic glycaemic control. Although, this meta-analysis showed there was a tendency for improvement in glycaemic control due to resistance training or resistance training combined with endurance training, there were not enough studies and/or subjects to confirm this statistically. CONCLUSIONS Based on this meta-analysis, we can conclude that the addition of brief bouts of high-intensity, sprint-type exercise to aerobic exercise can minimize the risk of sustaining a hypoglycaemic episode. We can also conclude that only regular aerobic training will improve the glycated haemoglobin level of a patient with T1D.
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Affiliation(s)
- Cajsa Tonoli
- Human Physiology and Sports Medicine, Faculty of Physical Education and Physical Therapy, Vrije Universiteit Brussel, Brussels, Belgium
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