Thermoregulatory Efficiency is Increased after Heat Acclimation in Tropical Natives
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概要
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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<0.05) and the sweat rates from the forehead and the chest showed a small nonsignificant increase (p=0.34 and 0.17, respectively). The relative increase of local sweat rates on day 11 was not different among the sites; however, when comparing the limbs (arm, forearm, and thigh) with the trunk (forehead and chest), there was a significant higher increase in the limbs (32±5%) in comparison to the trunk (11±2%, p=0.001). After the heat acclimation period we observed higher wsk and Esw and reduced S/(H+R+C), meaning greater thermoregulatory efficiency. The increase in the limb sweat rate, but not the increase in the trunk sweat rate, correlated with the increased wsk, Esw, and reduced S/(H+R+C) (p<0.05 to all). Altogether, it can be concluded that heat acclimation increased the limbs sweat rates in tropical natives and that this increase led to increased loss of heat through evaporation of sweat and this higher sweat evaporation was related to higher thermoregulatory efficiency.
- 2010-01-01
著者
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MAGALHAES Flavio
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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PASSOS Renata
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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FONSECA Michele
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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OLIVEIRA Kenya
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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FERREIRA-JUNIOR Joao
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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MARTINI Angelo
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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LIMA Milene
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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GUIMARAES Juliana
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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BARAUNA Valerio
Laboratory of Biochemistry of Physical Activity, School of Physical Education and Sport, Department
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SILAMI-GARCIA Emerson
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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RODRIGUES Luiz
Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational T
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Martini Angelo
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Lima Milene
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Magalhaes Flavio
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Passos Renata
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Oliveira Kenya
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Rodrigues Luiz
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Rodrigues Luiz
Laboratorio De Fisiologia Do Exercicio Escola De Educacao Fisica Fisioterapia E Terapia Ocupacional
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Barauna Valerio
Laboratory Of Biochemistry Of Physical Activity School Of Physical Education And Sport Department Of
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Fonseca Michele
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Magalhaes Flavio
Laboratorio De Fisiologia Do Exercicio Escola De Educacao Fisica Fisioterapia E Terapia Ocupacional
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Guimaraes Juliana
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Ferreira-junior Joao
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Silami-garcia Emerson
Laboratory Of Exercise Physiology School Of Physical Education Physical Therapy And Occupational The
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Silami-garcia Emerson
Laboratorio De Fisiologia Do Exercicio Escola De Educacao Fisica Fisioterapia E Terapia Ocupacional
関連論文
- Thermoregulatory Efficiency is Increased after Heat Acclimation in Tropical Natives
- Possible Biphasic Sweating Response during Short-term Heat Acclimation Protocol for Tropical Natives