Thermoregulatory Efficiency is Increased after Heat Acclimation in Tropical Natives

To evaluate the effects of heat acclimation on sweat rate redistribution and thermodynamic parameters, 9 tropical native volunteers were submitted to 11 days of exercise-heat exposures (40±0°C and 45.1±0.2% relative humidity). Sudomotor function was evaluated by measuring total and local (forehead,...

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Published in:Journal of PHYSIOLOGICAL ANTHROPOLOGY 2010/01/31, Vol.29(1), pp.1-12
Main Authors: Magalhães, Flávio C., Passos, Renata L. F., Fonseca, Michele A., Oliveira, Kenya P. M., Ferreira-Júnior, João B., Martini, Angelo R. P., Lima, Milene R. M., Guimarães, Juliana B., Baraúna, Valério G., Silami-Garcia, Emerson, Rodrigues, Luiz O. C.
Format: Article
Language:English
Subjects:
Acclimatization - physiology
Adult
Analysis of Variance
Body Temperature
Brazil
Exercise
facilitated sweat evaporation
Heart Rate
heat acclimation
Hot Temperature
Humans
Male
Oxygen Consumption - physiology
sweat function
Sweating - physiology
Thermodynamics
Tropical Climate
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Summary:To evaluate the effects of heat acclimation on sweat rate redistribution and thermodynamic parameters, 9 tropical native volunteers were submitted to 11 days of exercise-heat exposures (40±0°C and 45.1±0.2% relative humidity). Sudomotor function was evaluated by measuring total and local (forehead, chest, arm, forearm, and thigh) sweat rates, local sweat sodium concentration, and mean skin and rectal temperatures. We also calculated heat production (H), heat storage (S), heat exchange by radiation (R) and by convection (C), evaporated sweat (Esw), sweating efficiency (ηsw), skin wettedness (wsk), and the ratio between the heat storage and the sum of heat production and heat gains by radiation and convection (S/(H+R+C)). The heat acclimation increased the whole-body sweat rate and reduced the mean skin temperature. There were changes in the local sweat rate patterns: on the arm, forearm, and thigh it increased significantly from day 1 to day 11 (all p
ISSN:1880-6791
1880-6805
DOI:10.2114/jpa2.29.1