Thermoregulatory Efficiency is Increased after Heat Acclimation in Tropical Natives

DOI 被引用文献1件 参考文献78件
  • Magalhães Flávio C.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais Laboratory of Biochemistry of Physical Activity, School of Physical Education and Sport, Department of Biodynamic of the Human Movement, University of São Paulo, Brazil
  • Passos Renata L. F.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Fonseca Michele A.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Oliveira Kenya P. M.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Ferreira-Júnior João B.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Martini Angelo R. P.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Lima Milene R. M.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Guimarães Juliana B.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Baraúna Valério G.
    Laboratory of Biochemistry of Physical Activity, School of Physical Education and Sport, Department of Biodynamic of the Human Movement, University of São Paulo, Brazil
  • Silami-Garcia Emerson
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais
  • Rodrigues Luiz O. C.
    Laboratory of Exercise Physiology, School of Physical Education, Physical Therapy and Occupational Therapy, Department of Physical Education, Federal University of Minas Gerais

この論文をさがす

抄録

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.

収録刊行物

被引用文献 (1)*注記

もっと見る

参考文献 (78)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ