Effects of Short-term Exercise in the Heat on Thermoregulation, Blood Parameters, Sweat Secretion and Sweat Composition of Tropic-dwelling Subjects
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概要
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This study investigates the effects of a shortterm aerobic training program in a hot environment on thermoregulation, blood parameters, sweat secretion and composition in tropic-dwellers who have been exposed to passive heat. Sixteen healthy Malaysian-Malay male volunteers underwent heat acclimation (HA) by exercising on a bicycle ergometer at 60% of VO_2max for 60min each day in a hot environment (Ta : 31.1±0.1℃, rh : 70.0±4.4%) for 14 days. All parameters mentioned above were recorded on Day 1 and at the end of HA (Day 16). On these two days, subjects rested for 10min, then cycled at 60% of VO_2max for 60min and rested again for 20min (recovery) in an improvised heat chamber. Rectal temperature (T_<re>), mean skin temperature (T_<sk>) heart rate (HR), ratings of perceived exertion (RPE), thermal sensation (TS), local sweat rate and percent dehydration were recorded during the test. Sweat concentration was analysed for sodium [Na^+]_<sweat> and potassium. Blood samples were analysed for biochemical changes, electrolytes and hematologic indices. Urine samples were collected before and after each test and analysed for electrolytes. After the period of acclimation the percent dehydration during exercise significantly increased from 1.77±0.09% (Day 1) to 2.14±0.07% (Day 16). Resting levels of hemoglobin, hematocrit and red blood cells decreased significantly while [Na^+]_<sweat> increased significantly. For T_<re> and T_<sk> there were no differences at rest. T_<re>, HR, RPE, TS, plasma lactate concentration, hemoglobin and hematocrit at the 40th min of exercise were significantly lower after the period of acclimation but mean corpuscular hemoglobin and serum osmolality were significantly higher while no difference was seen in [Na^+]_<sweat> and T_<sk>. It can be concluded that tropicdwelling subjects, although exposed to prolonged passive heat exposure, were not fully heat acclimatized. To achieve further HA, they should gradually expose themselves to exercise-heat stress in a hot environment.
- 日本生理人類学会の論文
著者
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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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Sirisinghe Roland
Department Of Physiology
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SINGH Rabindarjeet
Sports Science Unit, School of Medical Sciences, Universiti Sains Malaysia
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Saat Mohamed
Department of Physiology, School of Medical Sciences, Universiti Sains Malaysia (USM)
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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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Tochihara Yutaka
Dep. Of Ergonomics Fac. Of Design Kyushu Univ.
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Tochihara Yutaka
Department Of Ergonomics Faculty Of Deign Kyushu University
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Singh Rabindarjeet
Sports Science Unit School Of Medical Sciences Universiti Sains Malaysia
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Singh Rabindarjeet
Sport Science Unit, Department of Physiology, University of Sains Malaysia
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