Sex-related differences in evaporative heat loss: the importance of metabolic heat production

被引:0
作者
Daniel Gagnon
Ollie Jay
Bruno Lemire
Glen P. Kenny
机构
[1] University of Ottawa,Laboratory of Human Bioenergetics and Environmental Physiology, School of Human Kinetics
来源
European Journal of Applied Physiology | 2008年 / 104卷
关键词
Calorimetry; Oxygen consumption; Relative workload; Sweating; Thermoregulation;
D O I
暂无
中图分类号
学科分类号
摘要
We evaluated the hypothesis that different rates of metabolic heat production between sexes, during exercise at the same percentage of maximum oxygen consumption \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \left( {\dot{V}{\text{O}}_{2\max } } \right), $$\end{document} give proportional differences in evaporative heat loss. Seven males and seven females, exercised at 41.3 ± 2.7% \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \dot{V}{\text{O}}_{2\max } $$\end{document} for 60-min at 40°C and 30% relative humidity. Whole-body direct air calorimetry measured rate of whole-body evaporative heat loss \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \left( {\dot{H}_{\text{E}} } \right), $$\end{document} while metabolic heat production \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \left( {\dot{M} - \dot{W}} \right) $$\end{document} was measured by indirect calorimetry. \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \dot{M} - \dot{W} $$\end{document} was greater in males (243 ± 18 W m−2) relative to females (201 ± 4 W m−2) (P ≤ 0.05) throughout exercise. This was paralleled by a greater \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \dot{H}_{\text{E}} $$\end{document} at end-exercise in males (207 ± 51 W m−2) relative to females (180 ± 3 W m−2) (P ≤ 0.05). Differences in metabolic heat production between sexes during exercise at a fixed percentage of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \dot{V}{\text{O}}_{2\max } $$\end{document} give differences in evaporative heat loss. To compare thermoregulatory function between sexes, differences in metabolic heat production must therefore be accounted for.
引用
收藏
页码:821 / 829
页数:8
相关论文
共 73 条
  • [1] Austin DM(1986)Body size and heat tolerance: a computer simulation Hum Biol 58 153-169
  • [2] Lansing MW(1980)Physiological responses of physically fit men and women to acclimation to humid heat J Appl Physiol 49 254-261
  • [3] Avellini BA(1980)Physiological responses of men and women to prolonged dry heat exposure Aviat Space Environ Med 51 1081-1085
  • [4] Kamon E(1998)Effects of age and gender on sweating pattern during exercise Int J Sports Med 19 S106-S107
  • [5] Krajewski JT(1969)Heat regulation: homeostasis of central temperature in man Physiol Rev 49 671-759
  • [6] Avellini BA(1979)Sex differences in human thermoregulatory response to heat and cold stress Hum Factors 21 687-699
  • [7] Shapiro Y(1916)A formula to estimate the approximate surface area if height and weight be known Arch Intern Med 17 863-871
  • [8] Pandolf KB(1981)Responses to dry heat of men and women with similar aerobic capacities J Appl Physiol 50 65-70
  • [9] Pimental NA(2000)Determinants of the variability in respiratory exchange ratio at rest and during exercise in trained athletes Am J Physiol Endocrinol Metab 279 E1325-E1334
  • [10] Goldman RF(1968)Regulation of internal body temperature Annu Rev Physiol 30 641-710