Louisiana State University -Shreveport, USA.
University of Regina, Canada.
J Therm Biol. 2022 Aug;108:103305. doi: 10.1016/j.jtherbio.2022.103305. Epub 2022 Aug 7.
This research evaluated the impact of rapid heat stress on the rate of salivary cortisol appearance. We hypothesized that rapid heat stress would result in an increased rate of salivary cortisol appearance. Fourteen adult male participants performed an incremental exercise test to a termination criterion (volitional maximum, core temperature = 39.5 °C, or a 2-h time maximum time) with or without firefighting gear in a laboratory with an ambient temperature of 25-26 °C. Salivary cortisol was collected at each 0.5 °C increase in core temperature. We observed a significant increase (p ≤ 0.01) in the rate of cortisol appearance when the subjects were wearing the firefighting gear; no change was observed without firefighting gear. Our results demonstrate that rapid heat stress and the resulting physiological stress cause a rapid increase in the rate of salivary cortisol appearance. Our results also support previous research demonstrating that cortisol is a sensitive strain metric of heat intolerance.
这项研究评估了快速热应激对唾液皮质醇出现率的影响。我们假设快速热应激会导致唾液皮质醇出现率增加。14 名成年男性参与者在环境温度为 25-26°C 的实验室中穿着或不穿着消防装备进行递增运动测试，直至达到终止标准（自主最大，核心温度=39.5°C 或 2 小时时间最大）。在核心温度每升高 0.5°C 时收集唾液皮质醇。当受试者穿着消防装备时，我们观察到皮质醇出现率显著增加（p≤0.01）；而不穿消防装备时则没有变化。我们的结果表明，快速热应激和由此产生的生理应激会导致唾液皮质醇出现率迅速增加。我们的结果还支持先前的研究，表明皮质醇是耐热性敏感的应激指标。
