Effects of Exercise in the Heat on Thermoregulation of Japanese and Malaysian Males
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概要
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The effect of low-intensity exercise in the heat on thermoregulation and certain biochemical changes in temperate and tropical subjects under poorly and well-hydrated states was examined. Two VO_<2max> matched groups of subjects consisting of 8 Japanese (JS) and 8 Malaysians (MS) participated in this study under two conditions:poorlyhydrated (no water was given) and well-hydrated (3mL, Kg^<-1> body weight of water was provided at onset of exercise, and the 15th, 35th and 55th min of exercise). The experimental room in both countries was adjusted to a constant level (Ta:31.6±0.03℃, rh:72.3±0.13%). Subjects spent an initial 10 min rest, 60 min of cycling at 40% VO<2max> and then 40 min recovery in the experimental room. Rectal temperatures (T_<re>) skin temperatures (T_<sk>), heart rate (HR), heat-activated sweat glands density (HASG), local sweat rate M_<sw-back>) and percent dehydration were recorded during the test. Blood samples were analysed for plasma glucose and lactate levels. The extent of dehydration was significantly higher in the combined groups of JS (1.43±0.08%) compared to MS (1.15±0.05%). During exercise M_<sw-back> was significantly higher in JS compared to MS in the well-hydrated condition. The HASG was significantly more in JS compared to MS at rest and recovery. T_<re> was higher in MS during the test. T_<sk> was significantly higher starting at the 5th min of exercise until the end of the recovery period in MS compared to JS. In conclusion, tropical natives have lower M_<sw-back> associated with higher T_<sk> and T_<re> during the rest, exercise and recovery periods. However, temperate natives have higher M_<sw-back> and lower T_<sk> and T_<re> during experiments in a hot environment. This phenomenon occurs in both poorly-hydrated and well-hydrated states with low intensity exercise. The differences in M_<sw-back>, T_<sk> and T_<re> are probably due to a setting of the core temperature at a higher level and enhancement of dry heat loss, which occurred during passive heat exposure.
- 日本生理人類学会の論文
著者
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CHOU Chin
Department of Veterinary Medicine, National Taiwan University
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Chou Chin
Department Of Ergonomics Faculty Of Design Kyushu University
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TOCHIHARA Yutaka
Department of Ergonomics, Kyushu University
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Saat Mohamed
九州大学 人間工学
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Ismail Mohamed
Department Of Physiology:department Of Ergonomics Faculty Of Design Kyushu University
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Hashiguchi Nobuko
Department of Ergonomics, Faculty of Design, Kyushu University
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Sirisinghe Roland
Department Of Physiology
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Saat Mohamed
Department of Physiology, School of Medical Sciences, Universiti Sains Malaysia (USM)
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Fujita Mizuho
Department of Ergonomics, Faculty of Design, Kyushu University
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Tochihara Yutaka
Department Of Ergonomics Faculty Of Design Kyushu University
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Tochihara Yutaka
Faculty Of Design Kyushu University
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Tochihara Yutaka
Department Of Physiological Hygiene National Institute Of Public Health
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Saat Mohamed
Department Of Physiology School Of Medical Science Universiti Sains Malaysia
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Saat Mohamed
Department Of Environmental Physiology Institute Of Tropical Medicine Nagasaki University
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Sirisinghe Roland
Department Of Physiology School Of Medical Science Universiti Sains Malaysia Malaysia
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Fujita Mizuho
Department Of Ergonomics Faculty Of Design Kyushu University
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Tochihara Yutaka
Dep. Of Ergonomics Fac. Of Design Kyushu Univ.
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Hashiguchi Nobuko
九州大学 芸術工学部人間工学
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Hashiguchi Nobuko
Department Of Ergonomics Faculty Of Deign Kyushu University
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Tochihara Yutaka
Department Of Ergonomics Faculty Of Deign Kyushu University
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