Effects of Difference in Body Weight on Physiological Responses of Men During Immersion of Their Legs in Hot Water Bath
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Anthropometric measurements and observations of physiological responses to heat were made on ten male distance runners and ten male throwers in summer. Experiments were carried out at around 15.00 h. The subjects were instructed to fast and rest for at least two hrs before the experiment in order to minimize effects of specific dynamic action and exercise. After staying for 60 min in a climatic chamber of 30 °C, 70% R. H. and a wind velocity of 17 cm/s, each subject, clad only in shorts, immersed his legs up to the knees in a stirred water bath of 42°C for 60 min. The distance runners showed significantly lower height, lighter body weight, smaller circumferences of chest and extremities, lesser skinfold thickness and greater ratio of body surface area to body weight than the throwers. The distance runners showed significantly higher mean skin temperature, lower rectal temperature and considerably lower heart rate before immersion of legs in the hot water than the throwers. Metabolic rates per body surface area for the distance runners were lower than those for the thrower throughout the experiment. The distance runners showed significantly greater ratio of body weight loss to initial body weight, greater local sweat rate and lower heart rate. Rectal temperatures for the distance runners were higher than those for the throwers after 45 min of immersion of legs in the hot water and the rise in rectal temperature for the distance runners during heat exposure was greater than that for the throwers. The distance runners showed less increase in heart rate and greater sweat rate per body surface area at a given rectal temperature. The distance runners showed higher conductiveconvective heat transfer coefficient from core to shell than throwers. Higher rise in rectal temperature for the distance runners might be due to lighter body weight when compared with that of the throwers. Higher mean skin temperature, higher conductive-convective heat transfer of body at 30°C before heat exposure and lower heart rate during heat exposure for the distance runners might be due to superior cardiovascular function of the distance runners induced by their daily strenuous physical training. Higher sweat rate per body surface area at a given rectal temperature for the distance runners may be explained as a result of deeper adaptation to hot environment for the distance runners induced by strenuous physical training. Most of the differences in physiological responses of men during immersion of legs in hot water bath between the distance runners and the throwers might be caused by difference of body weight between the two groups.
- 日本生気象学会の論文
日本生気象学会 | 論文
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