Department of Textiles, Merchandising and Fashion Design, Seoul National University, Korea.
Research Institute for Human Ecology, Seoul National University, Korea.
Ind Health. 2020 Apr 2;58(2):91-106. doi: 10.2486/indhealth.2018-0205. Epub 2019 Jun 29.
This study investigated the separate and combined effects of skin cooling and cold fluid ingestion on the alleviation of heat strain when wearing protective firefighting clothing at an air temperature of 30°C with 50%RH. A vest with the dual functions of cooling and providing sports drink supply (1.2% body mass) was developed. Eight males participated in the following four conditions: control [CON], drinking only [DO], cooling only [CO], and both cooling and drinking [CD]. The results showed that rectal (T), mean skin temperature (T) and heart rate (HR) during recovery were lower for CD than for CON (p<0.05), while no significant differences between the four conditions were found during exercise. CO significantly reduced mean T and HR and improved thermal sensation, whereas DO was effective for relieving thirst and lowering HR in recovery. In summary, the combined effect of skin cooling and fluid ingestion was synergistically manifested in T, T and thermal sensation in recovery.Practitioner Summary: The present results provide data on a novel vest that contributes to alleviating firefighters' heat strain. Because a cooling vest after melting may be a burden for firefighters, this study indicates a practical way to reduce the additional weight load of the vest by drinking the melted fluid of the cooling packs.
本研究旨在探讨在 30°C、50%相对湿度环境下穿着防护服时，皮肤冷却和冷液摄入对缓解热应激的单独和联合作用。为此，研发了一款具有冷却和提供运动饮料供给（占体重的 1.2%）双重功能的背心。8 名男性志愿者分别在以下四种条件下进行测试：对照（CON）、仅饮水（DO）、仅冷却（CO）和冷却与饮水联合（CD）。结果表明，在恢复期，CD 组的直肠温度（T）、平均皮肤温度（T）和心率（HR）均低于 CON 组（p<0.05），而在运动期间四组间无显著差异。CO 可显著降低平均 T 和 HR，并改善热感觉，而 DO 则可在恢复期缓解口渴和降低 HR。总之，皮肤冷却和液体摄入的联合作用在恢复期的 T、T 和热感觉方面表现出协同效应。从业者总结：本研究结果提供了一种新型背心的数据，有助于缓解消防员的热应激。由于冷却背心在融化后可能会给消防员带来负担，因此本研究表明了一种通过饮用冷却包融化后的液体来减轻背心额外重量负荷的实用方法。
