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Improvements in glycaemic control after acute moderate-intensity continuous or high-intensity interval exercise are greater in South Asians than white Europeans with nondiabetic hyperglycaemia: a randomised crossover study

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journal contribution
posted on 05.10.2020 by Jack Sargeant, Charlotte Jelleyman, Nicole Coull, Charlotte Edwardson, Joe Henson, James King, Kamlesh Khunti, Matthew McCarthy, Alex Rowlands, David Stensel, David Webb, Melanie Davies, Tom Yates
Objective: To examine whether circulating metabolic responses to low-volume high-intensity interval (LV-HIIE) or continuous moderate-intensity aerobic (CME) exercise differ between white Europeans and South Asians with nondiabetic hyperglycaemia (NDH). Research Design and Methods: 13 white Europeans and 10 South Asians (combined median (IQR) age 67 (60–68) years, HbA1c 5.9 (5.8–6.1)% [41.0 (39.9–43.2) mmol·mol-1]) completed three 6-hour conditions (sedentary control [CON], LV-HIIE, CME) in a randomised order. Exercise conditions contained a single bout of LV-HIIE and CME respectively (each ending at 2h), with meals provided at 0 and 3h. Circulating glucose (primary outcome), insulin, insulin resistance index (IRI), triglyceride and non-esterified fatty acids were measured at 0, 0.5, 1, 2, 3, 3.5, 4, 5 and 6h. Data were analysed as post-exercise time-averaged area under the curve (AUC), adjusted for age, sex and pre-exercise AUC. Results: Glucose was similar in each condition and ethnicity, with no condition-by-ethnicity interaction (P≥0.28). However, insulin was lower in LV-HIIE (mean [95% CI]: -44.4 [-23.7, -65.1] mU·L-1) and CME (-33.8 [-13.7, -53.9] mU·L-1) compared to CON. Insulin responses were greater in South Asians (interaction P=0.03) such that values were similar in each ethnicity during exercise conditions, despite being 33% higher in South Asians during CON. IRI followed a similar pattern to insulin. Lipids were unaffected by exercise. Conclusions: Reductions in insulin and insulin resistance after acute LV-HIIE and CME are greater in South Asians than white Europeans with NDH. Further trials are required to examine longer-term impact of LV-HIIE and CME on cardiometabolic health.

Funding

NIHR Leicester Biomedical Research Centre and the NIHR Applied Research Collaboration East Midlands

History

School

  • Sport, Exercise and Health Sciences

Published in

Diabetes Care

Publisher

American Diabetes Association

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Diabetes Care and the definitive published version is available at

Acceptance date

04/10/2020

ISSN

0149-5992

eISSN

1935-5548

Language

en

Depositor

Dr James King Deposit date: 4 October 2020

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