Studies on heat acclimation induced by exercise and heat acclimatization induced by climate.
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Seasonal variations and changes in physiological responses to heat induced by exercise were studied on ten male nonathletic university students. Each subject took exercise for 14 successive days except the day of sweat test in a room of 28°C, 70% relative humidity in winter. Muscular exercise was performed on a bicycle ergometer at a work load corresponding to 5 R.M.R, at a cycling rate of 50 rpm for 60 min. Sweat tests were performed in summer, and on the day before beginning of physical training, 8 th and 15 th days during training in winter. Sweating was induced by immersion of both legs just up to the knees into a stirred water bath of 42°C in a room of 30°C with 70% relative humidity for 90 min. Greater sweat volume, markedly lower Na concentration in sweat, smaller rise in rectal temperature and less increase in heart rate during sweat test were observed in summer than in winter. Increase in sweat rate, slight decrease in Na concentration in sweat, decrease in rise in rectal temperature and significantly reduction in increase of heart rate during heat exposure were observed during physical training in winter. Seasonal change in Na concentration in sweat was greater than that induced by training, while seasonal change in increase of heart rate during heat exposure was much less than that induced by training. Seasonal change in the ratio of sweat volume to rise in rectal temperature was approximately the same as change induced by training. Seasonal variation in Na concentration at a given sweat volume was much greater than change induced by training.<BR>The ratio of increase in heart rate to rise in rectal temperature decreased considerably during training while it decreased slight in summer.
- 日本生気象学会の論文
日本生気象学会 | 論文
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