Graduate School of Human Sciences, Waseda University, Tokorozawa, Japan; Body Temperature and Fluid Laboratory, Faculty of Human Sciences, Waseda University, Tokorozawa, Japan.
Body Temperature and Fluid Laboratory, Faculty of Human Sciences, Waseda University, Tokorozawa, Japan.
J Therm Biol. 2019 May;82:83-89. doi: 10.1016/j.jtherbio.2019.03.014. Epub 2019 Mar 26.
The aim of the present study was to clarify physical risks during hot-water bathing by measuring thermal and cardiovascular responses and thermal sensation. Young men and women (n = 7 and 5, respectively) participated in the present study, which consisted of two trials mimicking bathing behavior at room temperature of 25 °C and 15 °C. Participants bathed in 41 °C water for 20 min to the subclavian level. Before bathing, participants rested fully clothed for 15 min and then rested for 15 min without clothes. After bathing, they rested without clothes for 15 min and afterwards rested fully clothed for another 15 min. Tympanic temperature (T), heart rates (HR), mean skin temperature (T), mean arterial pressure (MAP), and laser-Doppler flow at the chest and forehead (LDF and LDF) were evaluated. Thermal perception was assessed with a visual analogue scale. Mean T in the 15 °C trial decreased during the period without clothing while MAP increased. The value remained unchanged in the 25 °C trial. During bathing, T, mean T, HR, LDF, and LDF increased in both trials, and MAP decreased to similar levels. Relative change in LDF was greater in the 15 °C trial than in the 25 °C trial. Participants felt cold when they were without clothes at 15 °C; however, the thermal perception during bathing was similar between the two trials. Greater changes in cardiovascular and thermal responses were observed during the bathing behavior. In addition, bathing in cold room augmented the changes, which may induce some physical risks during bathing.
本研究旨在通过测量热和心血管反应以及热感觉来阐明热水浴时的身体风险。分别有 7 名男性和 5 名女性参加了本研究，研究包括模拟室温为 25°C 和 15°C 时的洗浴行为的两个试验。参与者将在 41°C 的水中洗浴 20 分钟，直至锁骨水平。洗浴前，参与者穿着衣服充分休息 15 分钟，然后不穿衣服休息 15 分钟。洗浴后，他们不穿衣服休息 15 分钟，然后再穿着衣服休息 15 分钟。评估了鼓膜温度（T）、心率（HR）、平均皮肤温度（T）、平均动脉压（MAP）和胸部及前额的激光多普勒流量（LDF 和 LDF）。热感觉通过视觉模拟量表进行评估。在不穿衣服的 15°C 试验期间，平均 T 下降，而 MAP 增加。在 25°C 试验中，数值保持不变。在洗浴过程中，T、平均 T、HR、LDF 和 LDF 在两个试验中均增加，MAP 下降到相似水平。LDF 的相对变化在 15°C 试验中大于 25°C 试验。参与者在 15°C 时不穿衣服时感到寒冷；然而，两个试验中的洗浴期间的热感觉相似。心血管和热反应的变化较大。此外，在寒冷的房间里洗浴会加剧这些变化，这可能在洗浴过程中带来一些身体风险。
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