Effect of exercise-heat acclimation on cardiac autonomic modulation in type 2 diabetes: a pilot study.

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme
Michael J MacartneyGlen P Kenny

Abstract

The effects of exercise-heat acclimation on heart rate variability (HRV) in individuals with type 2 diabetes (T2D) remains unclear. We assessed electrocardiogram recordings during exercise-heat stress in middle-aged-to-older individuals (50-70 years) with (n = 6) and without (control; n = 8;) T2D, before and after 7 days of exercise-heat acclimation. Exercising heart rate was reduced (control, -9 ± 5 bpm; T2D, -14 ± 9 bpm) yet HRV was not significantly different. Given the negative correlations between diminished HRV and cardiac risk observed in the scientific literature, further research is warranted. Novelty: Our observations indicate that 7 days exercise-heat acclimation may not effectively attenuate the deviation toward reduced overall HRV and unfavourable cardiac autonomic modulation in individuals with T2D.

References

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Jul 15, 2005·The Journal of Clinical Endocrinology and Metabolism·Raelene E Maser, M James Lenhard
Jan 6, 2009·The American Journal of Cardiology·Xavier JouvenPierre Ducimetière
Aug 26, 2009·CMAJ : Canadian Medical Association Journal = Journal De L'Association Medicale Canadienne·Glen P KennyOllie Jay
Jun 25, 2014·European Journal of Applied Physiology·Andreas D FlourisGlen P Kenny
Dec 19, 2018·Diabetes Care·UNKNOWN American Diabetes Association
Oct 9, 2019·JAMA : the Journal of the American Medical Association·Sean R NotleyGlen P Kenny
Feb 3, 2020·Acta Diabetologica·Michael J MacartneyGlen P Kenny

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