서열환경하에서 체지방률에 따른 오전과 오후의 체온조절반응
Thermoregulatory Responses of AM & PM with Body Fat Rate at a Hot Environment
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Abstract
With regard to the fact that temperature of human body remains almost constant at 37oC, changes by circadian variation, this study intended to investigate the effect of circadian rhythm on physiological responses of human body according to body fat rate. Fifteen healthy adult women were recruited for this study and were measured body fat as a fat), medium body fat group(group M-20%. 30% of body fat) and high body fat group(group H-more than 30% of body fat). The experiment was caried out in a climate chamber of 32oC, 60% RH with the repeat of Exercise and Rest period. Subjects participated in two experiments, one is morning experiment(called AM), the other is afternoon experiment (called PM). The results of this study are as folows ; As to the variation of rectal temperature, group L and M had a significant diference in the time of the day between AM and PM, but group H had almost the same rectal temperature in the two kinds of experimental time. The reason why group H had a smaller difference in the circadian rhythm of rectal temperature in this study is estimated at the Bud et al.(1991)s results that body fat had effects on reduction in ther-mogenesis, radiation, mean skin temperature, and increase in insulation of the tissues. Group M had the highest mean skin temperature in the PM. All the 3 groups didnt have stable values in AM. But it showed more stable in PM than but in group L and H, sweat rate was almost the same in two kinds of time of the day. This result suggests that who have more or less body fat have larger diference in sweat rate between morning and afternon than who have normal body fat.
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