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在等效湿球温度的热干和温湿环境中行走的热应变差异
Nathan E Bartman1, Nicole T Vargas2, Lora A Cavuoto3
1Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, New York, USA.
Temperature (Austin, Tex.)
|November 25, 2024
概括
不同的热环境具有相同的湿球球体温度 (WBGT),导致工人的核心体温相似. 然而,与温湿条件相比,热干条件增加了生理应变,包括较高的皮肤温度和出汗率.
科学领域:
- 环境生理学环境生理学
- 职业健康 职业健康 职业健康
- 热调节研究 热调节研究
背景情况:
- 湿球球体温度 (WBGT) 是用于评估职业环境中的热应激的标准度量.
- 环境条件可以显著变化,同时产生相同的WBGT,这引发了关于不同生理影响的问题.
研究的目的:
- 为了调查生物物理,生理和感知反应是否在热干和温湿条件之间有所不同,与相当的WBGT.
- 为了比较身体的热量储存和在两个不同的热环境中行走时的应变.
主要方法:
- 十二名受试者在27.8°C的WBGT环境中以60%的最大心率行走了90分钟.
- 条件包括热干 (40°C,19%的RH) 和温湿 (30°C,77%的RH).
- 用分区热量计测量热储量;监测生理和感知反应.
主要成果:
- 在热干和热湿条件之间,没有观察到核心温度或累积热储量的显著差异.
- 试验对象在炎热干燥的环境中体验到更高的皮肤温度,更大的口渴,以及增加的出汗率.
- 心率并没有显著不同,但心血管应变的开始可能会有所不同.
结论:
- 相当的WBGT环境不会引起相同的生理应变反应.
- 给定WBGT的热干条件可能会比温湿条件施加更大的生理应变 (例如,更高的皮肤温度,出汗率).
- 这凸显了考虑湿度与WBGT一起在职业安全中准确评估热应激的重要性.
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