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- Title
Cardiac autonomic modulation in type 1 diabetes during exercise-heat stress.
- Authors
Macartney, Michael J.; Notley, Sean R.; Herry, Christophe L.; Seely, Andrew J. E.; Sigal, Ronald J.; Kenny, Glen P.
- Abstract
Aims: Cardiac autonomic modulation, as assessed by heart rate variability (HRV), is independently attenuated by both type 1 diabetes (T1D) and exercise-heat stress, although their combined effects remain unclear. We therefore assessed HRV during exercise-heat stress in young individuals (18–37 years) with (n = 14) and without type 1 diabetes (n = 14). Methods: Participants completed 30-min seated rest and three, 30-min bouts of semi-recumbent cycling at light, moderate, and vigorous metabolic heat productions (200, 250, 300 W/m2, respectively), each followed by 30-min recovery. Body core temperature (Tcore) and electrocardiogram were recorded throughout and analyzed during the final 5-min of rest and each exercise period. Results: Relative to baseline, Tcore was increased in both groups, albeit to a greater extent in type 1 diabetes during vigorous exercise (T1D, 1.1 ± 0.3 °C; control, 0.8 ± 0.3 °C; P < 0.05). Overall HRV (as reflected by entropy) was attenuated throughout exercise relative to baseline in both groups, with the magnitude of the reduction greater in type 1 diabetes during vigorous exercise (T1D, − 108%; control, − 70%; P < 0.05). Conclusions: Given the negative correlations between decreased HRV and cardiac risk, our novel observations indicate that vigorous exercise in hot environments may pose a health concern for individuals with type 1 diabetes.
- Subjects
TYPE 1 diabetes; HEART beat; BODY temperature
- Publication
Acta Diabetologica, 2020, Vol 57, Issue 8, p959
- ISSN
0940-5429
- Publication type
Article
- DOI
10.1007/s00592-020-01505-9