Women have a greater cardiac vagal withdrawal to heat stress compared to men.

Autor: Ferreira FC; Laboratory of Experimental and Applied Exercise Physiology, Department of Physiology and Pharmacology, Fluminense Federal University, Niterói, Brazil., Padilha MCSV; Laboratory of Experimental and Applied Exercise Physiology, Department of Physiology and Pharmacology, Fluminense Federal University, Niterói, Brazil., Tobadini E; Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy.; Department of Internal Medicine, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy., Bellocchi C; Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy.; Department of Internal Medicine, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy., Carandina A; Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy.; Department of Internal Medicine, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy., Montano N; Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy.; Department of Internal Medicine, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy., Soares PPS; Laboratory of Experimental and Applied Exercise Physiology, Department of Physiology and Pharmacology, Fluminense Federal University, Niterói, Brazil., Rodrigues GD; Laboratory of Experimental and Applied Exercise Physiology, Department of Physiology and Pharmacology, Fluminense Federal University, Niterói, Brazil.; Department of Clinical Sciences and Community Health, University of Milan, 20122 Milan, Italy.
Jazyk: angličtina
Zdroj: Temperature (Austin, Tex.) [Temperature (Austin)] 2022 Oct 25; Vol. 10 (4), pp. 444-453. Date of Electronic Publication: 2022 Oct 25 (Print Publication: 2023).
DOI: 10.1080/23328940.2022.2135354
Abstrakt: The heated environment shifts the sympatho-vagal balance toward sympathetic predominance and vagal withdrawal. Women's heart is more reliant on vagal autonomic control, while men's heart is more dependent on sympathetic control. However, sex differences in cardiovascular autonomic responses to heat stress remain unknown. We aimed to investigate the cardiovascular autonomic regulation under heat stress between sexes. Thirty-two young participants (27 ± 4 years old; 16 women) were enrolled in a single visit, resting for 30min at baseline (thermal reference condition TC; ∼24°C) and 30min under a heated environment (HOT; ∼38°C). Blood pressure (BP), skin temperature, electrocardiogram, and respiratory oscillations were continuously recorded. The heart rate variability (HRV) was assessed by spectral analysis (low-frequency [LFnu; sympathetic and vagal] and high-frequency [HFnu; vagal]), and symbolic analysis (0 V% [sympathetic] and 2UV%, and 2LV% [vagal]). The spontaneous baroreflex sensitivity (BRS) was calculated by the gain between BP and R-R within the LF band (αLF). The estimated maximal aerobic capacity and body surface area were employed as covariates in sex comparisons. The effects of HOT were the following: 1) Women have a greater cardiac vagal withdrawal to heat stress compared to men; 2) Sex differences on cardiac autonomic response to heat stress exist after controlling for the effect of estimated physical fitness and body surface area. Therefore, heat stress provokes a higher vagal withdrawal to the heart in women compared to men. It could be attributed to sex per se since significant differences between men and women were not modified after covariate analysis.
Competing Interests: No potential conflict of interest was reported by the author(s).
(© 2022 Informa UK Limited, trading as Taylor & Francis Group.)
Databáze: MEDLINE
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