Cardiac autonomic modulation in type 1 diabetes during exercise-heat stress.
Acta Diabetol
; 57(8): 959-963, 2020 Aug.
Article
em En
| MEDLINE
| ID: mdl-32144491
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.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Sistema Nervoso Autônomo
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Exercício Físico
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Resposta ao Choque Térmico
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Diabetes Mellitus Tipo 1
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Coração
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article