Journal
JOURNAL OF THERMAL BIOLOGY
Volume 108, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtherbio.2022.103305
Keywords
Heat stress; Cortisol; Firefighting; Saliva
Funding
- WorkSafe BC Research Training Award
- UVic Centre for Occu-pational Research
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This study evaluated the impact of rapid heat stress on the rate of salivary cortisol appearance and found that rapid heat stress leads to an increased rate of salivary cortisol appearance.
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 degrees C, or a 2-h time maximum time) with or without firefighting gear in a laboratory with an ambient temperature of 25-26 degrees C. Salivary cortisol was collected at each 0.5 degrees 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.
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