Departmental Bulletin Paper 入浴に伴う体温、循環機能および温熱性快適感の変化 : 室温の影響

山崎, 文夫

9pp.9 - 17 , 2016-03-31 , 山口県立大学
Bathing induces a marked hemodynamic change due to the effects of external hydrostatic pressure in addition to the thermal load depending on the water temperature. Furthermore, a lower bathroom temperature in the winter season can potentially cause a bathing-related incident. However, information regarding the influence of the bathroom temperature on the psychophysiological function during bathing is limited. In the present study, therefore, we examined the influence of the bathroom temperature(10, 20, and 30℃)on the changes in body temperature,as well as circulatory and psychological parameters during 15-min bathing at a 40℃ water temperature in young male adults. The esophageal temperature remained unchanged during bathing under the 10℃ condition(0.0±0.2℃), but it increased by 0.3±0.2℃ under the 20℃ condition and by 0.7±0.1℃ under the 30℃ condition. The blood pressure and total peripheral vascular resistance before bathing increased depending on the bathroom temperature. The blood pressure remained unchanged during bathing under all temperature conditions, but it tended to decrease transiently just after bathing under the 30℃ condition. The cardiac output during bathing under the 30℃ condition was significantly higher than under the other temperature conditions. The thermal sensation changed depending on changes of the skin temperature on bathing. Thermal comfort increased on bathing under the 10℃ condition and decreased under the 30℃ condition,but did not change under the 20℃ condition. These results show that the cardiovascular system and thermal discomfort during bathing were markedly affected by the thermal conditions of a bathroom. To take a bath safely and comfortably in all seasons, it is desirable to appropriately manage the bathroom temperature.

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