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Kristensen KB, Ranjan AG, McCarthy OM, Holst JJ, Bracken RM, Nørgaard K, Schmidt S. Effects of a Low-Carbohydrate-High-Protein Pre-Exercise Meal in Type 1 Diabetes-a Randomized Crossover Trial. J Clin Endocrinol Metab 2023; 109:208-216. [PMID: 37463489 DOI: 10.1210/clinem/dgad427] [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] [Received: 06/01/2023] [Revised: 07/11/2023] [Accepted: 07/14/2023] [Indexed: 07/20/2023]
Abstract
CONTEXT Current guidelines for exercise-related glucose management focus on reducing bolus and/or basal insulin doses and considering carbohydrate intake. Yet far less attention has been paid to the potential role of other macronutrients alongside carbohydrates on glucose dynamics around exercise. OBJECTIVE To investigate the effects of a low-carbohydrate-high-protein (LCHP) compared with a high-carbohydrate-low-protein (HCLP) pre-exercise meal on the metabolic, hormonal, and physiological responses to exercise in adults with insulin pump-treated type 1 diabetes. METHODS Fourteen adults (11 women, 3 men) with insulin pump-treated type 1 diabetes (median [range] HbA1c of 50 [43-59] mmol/mol (6.7% [6.1%-7.5%]), age of 49 [25-65] years, and body mass index of 24.0 [19.3-27.1] kg/m2) completed an unblinded, 2-arm, randomized, crossover study. Participants ingested isocaloric meals that were either LCHP (carbohydrate 21%, protein 52%, fat 27%) or HCLP (carbohydrate 52%, protein 21%, fat 27%) 90 minutes prior to undertaking 45 minutes of cycling at moderate intensity. Meal insulin bolus was dosed according to meal carbohydrate content but reduced by 25%. Basal insulin rates were reduced by 35% from meal ingestion to end of exercise. RESULTS Around exercise the coefficient of variability was lower during LCHP (LCHP: 14.5 ± 5.3 vs HCLP: 24.9 ± 7.7%, P = .001). Over exercise, LCHP was associated with a lesser drop (LCHP: Δ-1.49 ± 1.89 vs HCLP: Δ-3.78 ± 1.95 mmol/L, P = .001). Mean insulin concentration was 30% lower during exercise for LCHP compared with HCLP (LCHP: 25.5 ± 11.0 vs HCLP: 36.5 ± 15.9 mU/L, P < .001). CONCLUSION Ingesting a LCHP pre-exercise meal lowered plasma glucose variability around exercise and diminished the drop in plasma glucose over exercise.
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Affiliation(s)
- Kasper B Kristensen
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, 2730 Herlev, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Ajenthen G Ranjan
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, 2730 Herlev, Denmark
- Danish Diabetes Academy, 5000 Odense C, Denmark
| | - Olivia M McCarthy
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, 2730 Herlev, Denmark
- Applied Sport, Technology, Exercise and Medicine Research Centre, Swansea University, SA1 8EN Swansea, UK
| | - Jens J Holst
- Department of Biomedical Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Richard M Bracken
- Applied Sport, Technology, Exercise and Medicine Research Centre, Swansea University, SA1 8EN Swansea, UK
| | - Kirsten Nørgaard
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, 2730 Herlev, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Signe Schmidt
- Copenhagen University Hospital-Steno Diabetes Center Copenhagen, 2730 Herlev, Denmark
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2
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Schroeder AE, Rosenkranz RR, Yarrow LK, Haub MD, Rosenkranz SK. Recovery Phase Nutrition and Insulin Strategies for a Collegiate Distance Runner with Type 1 Diabetes Mellitus: A Case Study. Sports (Basel) 2023; 11:214. [PMID: 37999431 PMCID: PMC10674803 DOI: 10.3390/sports11110214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 10/12/2023] [Accepted: 10/26/2023] [Indexed: 11/25/2023] Open
Abstract
PURPOSE There is scant published research regarding nutrition and insulin strategies for athletic performance in collegiate distance runners with type 1 diabetes mellitus (CDRT1). Acute carbohydrate supplementation (CHOsup) and insulin reduction used to minimize hypoglycemia during exercise may result in deteriorated glycemic control post exercise in CDRT1. The present case study of a CDRT1 investigated outcomes associated with a moderate-carbohydrate (ModCHO) diet and 24 h insulin adjustment during recovery phases for improved glycemic control and reduced use of acute strategies. METHODS During an 8-day period, a female CDRT1 followed a ModCHO (~4 g/kg/day) nutrition program. Recovery phase adjustments to insulin doses were made using an equation developed to estimate reduced insulin needs post exercise, as a function of exercise intensity and duration. Daily training was performed in the fasted state at 6:00 a.m. and included additional exercise strategies to reduce glycemic variability when needed. Daily blood glucose time-in-range (TIR) and use of CHOsup were assessed. Athlete well-being was determined using the Student-Athlete Well-Being Scale (SAWS)TM at baseline, and days 1, 3, and 7. RESULTS Throughout the 8-day period, mean TIR increased (77% versus < 50%) and the magnitude of glycemic excursions decreased (~3.8-15 versus ~3.0-26 mmol/L) relative to a prior comparison period. Minimal pre-exercise CHOsup was employed and CHOsup during exercise was not required. Additionally, the athlete achieved a new lifetime best in the 5000 m run and maintained positive well-being. CONCLUSION The present case study provides examples of recovery phase strategies (i.e., ModCHO diet and 24 h insulin adjustments) that may support glycemic control and athletic performance in CDRT1 and provides potential considerations for nutrition and insulin strategies for use by athletes and coaches.
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Affiliation(s)
- Amie E. Schroeder
- Department of Food, Nutrition, Dietetics and Health, College of Health and Human Sciences, Kansas State University, Manhattan, KS 66506, USA; (R.R.R.); (L.K.Y.); (M.D.H.); (S.K.R.)
| | - Richard R. Rosenkranz
- Department of Food, Nutrition, Dietetics and Health, College of Health and Human Sciences, Kansas State University, Manhattan, KS 66506, USA; (R.R.R.); (L.K.Y.); (M.D.H.); (S.K.R.)
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada Las Vegas, Las Vegas, NV 89154, USA
| | - Linda K. Yarrow
- Department of Food, Nutrition, Dietetics and Health, College of Health and Human Sciences, Kansas State University, Manhattan, KS 66506, USA; (R.R.R.); (L.K.Y.); (M.D.H.); (S.K.R.)
| | - Mark D. Haub
- Department of Food, Nutrition, Dietetics and Health, College of Health and Human Sciences, Kansas State University, Manhattan, KS 66506, USA; (R.R.R.); (L.K.Y.); (M.D.H.); (S.K.R.)
| | - Sara K. Rosenkranz
- Department of Food, Nutrition, Dietetics and Health, College of Health and Human Sciences, Kansas State University, Manhattan, KS 66506, USA; (R.R.R.); (L.K.Y.); (M.D.H.); (S.K.R.)
- Department of Kinesiology and Nutrition Sciences, School of Integrated Health Sciences, University of Nevada Las Vegas, Las Vegas, NV 89154, USA
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Muntis FR, Mayer-Davis EJ, Shaikh SR, Crandell J, Evenson KR, Smith-Ryan AE. Post-Exercise Protein Intake May Reduce Time in Hypoglycemia Following Moderate-Intensity Continuous Exercise among Adults with Type 1 Diabetes. Nutrients 2023; 15:4268. [PMID: 37836552 PMCID: PMC10574378 DOI: 10.3390/nu15194268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 09/29/2023] [Accepted: 10/03/2023] [Indexed: 10/15/2023] Open
Abstract
Little is known about the role of post-exercise protein intake on post-exercise glycemia. Secondary analyses were conducted to evaluate the role of post-exercise protein intake on post-exercise glycemia using data from an exercise pilot study. Adults with T1D (n = 11), with an average age of 33.0 ± 11.4 years and BMI of 25.1 ± 3.4, participated in isoenergetic sessions of high-intensity interval training (HIIT) or moderate-intensity continuous training (MICT). Participants completed food records on the days of exercise and provided continuous glucose monitoring data throughout the study, from which time in range (TIR, 70-180 mg/dL), time above range (TAR, >180 mg/dL), and time below range (TBR, <70 mg/dL) were calculated from exercise cessation until the following morning. Mixed effects regression models, adjusted for carbohydrate intake, diabetes duration, and lean mass, assessed the relationship between post-exercise protein intake on TIR, TAR, and TBR following exercise. No association was observed between protein intake and TIR, TAR, or TBR (p-values ≥ 0.07); however, a borderline significant reduction of -1.9% (95% CI: -3.9%, 0.0%; p = 0.05) TBR per 20 g protein was observed following MICT in analyses stratified by exercise mode. Increasing post-exercise protein intake may be a promising strategy to mitigate the risk of hypoglycemia following MICT.
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Affiliation(s)
- Franklin R. Muntis
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA; (F.R.M.); (S.R.S.)
| | - Elizabeth J. Mayer-Davis
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA; (F.R.M.); (S.R.S.)
- Department of Medicine, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Saame R. Shaikh
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA; (F.R.M.); (S.R.S.)
| | - Jamie Crandell
- School of Nursing, University of North Carolina, Chapel Hill, NC 27599, USA;
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Kelly R. Evenson
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA;
| | - Abbie E. Smith-Ryan
- Department of Exercise & Sports Science, University of North Carolina, Chapel Hill, NC 27599, USA;
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Barouti AA, Björklund A, Catrina SB, Brismar K, Rajamand Ekberg N. Effect of Isocaloric Meals on Postprandial Glycemic and Metabolic Markers in Type 1 Diabetes-A Randomized Crossover Trial. Nutrients 2023; 15:3092. [PMID: 37513510 PMCID: PMC10386239 DOI: 10.3390/nu15143092] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/05/2023] [Accepted: 07/07/2023] [Indexed: 07/30/2023] Open
Abstract
The aim of this study was to assess the effect of four isocaloric meals with different macronutrient compositions on postprandial blood glucose, lipids, and glucagon in adults with type 1 diabetes (T1D). Seventeen subjects tested four isocaloric meals in a randomized crossover design. The meal compositions were as follows: high-carbohydrate (HC); high-carbohydrate with extra fiber (HC-fiber); low-carbohydrate high-protein (HP); and low-carbohydrate high-fat (HF). Blood glucose and lipid measurements were collected up to 4 h and glucagon up to 3 h postprandially. Mean postprandial glucose excursions were lower after the HP compared to the HC (p = 0.036) and HC-fiber meals (p = 0.002). There were no differences in mean glucose excursions after the HF meal compared to the HC and HP meals. The HF meal resulted in higher triglyceride excursions compared to the HP meal (p < 0.001) but not compared to the HC or HC-fiber meals. Glucagon excursions were higher at 180 min after the HP meal compared to the HC and HF meals. In conclusion, the low-carbohydrate HP meal showed the most favorable glycemic and metabolic effects during a 4 h postprandial period in subjects with T1D.
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Affiliation(s)
- Afroditi Alexandra Barouti
- Department of Molecular Medicine and Surgery, Karolinska Institute, 17176 Stockholm, Sweden
- Center for Diabetes, Academic Specialist Center, 11365 Stockholm, Sweden
| | - Anneli Björklund
- Department of Molecular Medicine and Surgery, Karolinska Institute, 17176 Stockholm, Sweden
- Center for Diabetes, Academic Specialist Center, 11365 Stockholm, Sweden
| | - Sergiu Bogdan Catrina
- Department of Molecular Medicine and Surgery, Karolinska Institute, 17176 Stockholm, Sweden
- Center for Diabetes, Academic Specialist Center, 11365 Stockholm, Sweden
| | - Kerstin Brismar
- Department of Molecular Medicine and Surgery, Karolinska Institute, 17176 Stockholm, Sweden
| | - Neda Rajamand Ekberg
- Department of Molecular Medicine and Surgery, Karolinska Institute, 17176 Stockholm, Sweden
- Center for Diabetes, Academic Specialist Center, 11365 Stockholm, Sweden
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Muntis FR, Smith-Ryan AE, Crandell J, Evenson KR, Maahs DM, Seid M, Shaikh SR, Mayer-Davis EJ. A High Protein Diet Is Associated with Improved Glycemic Control Following Exercise among Adolescents with Type 1 Diabetes. Nutrients 2023; 15:nu15081981. [PMID: 37111199 PMCID: PMC10143215 DOI: 10.3390/nu15081981] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/14/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
Nutritional strategies are needed to aid people with type 1 diabetes (T1D) in managing glycemia following exercise. Secondary analyses were conducted from a randomized trial of an adaptive behavioral intervention to assess the relationship between post-exercise and daily protein (g/kg) intake on glycemia following moderate-to-vigorous physical activity (MVPA) among adolescents with T1D. Adolescents (n = 112) with T1D, 14.5 (13.8, 15.7) years of age, and 36.6% overweight or obese, provided measures of glycemia using continuous glucose monitoring (percent time above range [TAR, >180 mg/dL], time-in-range [TIR, 70-180 mg/dL], time-below-range [TBR, <70 mg/dL]), self-reported physical activity (previous day physical activity recalls), and 24 h dietary recall data at baseline and 6 months post-intervention. Mixed effects regression models adjusted for design (randomization assignment, study site), demographic, clinical, anthropometric, dietary, physical activity, and timing covariates estimated the association between post-exercise and daily protein intake on TAR, TIR, and TBR from the cessation of MVPA bouts until the following morning. Daily protein intakes of ≥1.2 g/kg/day were associated with 6.9% (p = 0.03) greater TIR and -8.0% (p = 0.02) less TAR following exercise, however, no association was observed between post-exercise protein intake and post-exercise glycemia. Following current sports nutrition guidelines for daily protein intake may promote improved glycemia following exercise among adolescents with T1D.
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Affiliation(s)
- Franklin R Muntis
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Abbie E Smith-Ryan
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Exercise & Sports Science, University of North Carolina, Chapel Hill, NC 27519, USA
| | - Jamie Crandell
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Kelly R Evenson
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
| | - David M Maahs
- Division of Endocrinology, Department of Pediatrics, School of Medicine, Stanford University, Stanford, CA 94305, USA
- Stanford Diabetes Research Center, Stanford, CA 94304, USA
| | - Michael Seid
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children's Hospital, Cincinnati, OH 45229, USA
| | - Saame R Shaikh
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Elizabeth J Mayer-Davis
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, USA
- Department of Medicine, University of North Carolina, Chapel Hill, NC 27514, USA
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