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• W4387053575 abstract "Previous research has evaluated the association between skin temperature (Tsk) and core temperature (Tc) during various types of heat stress. However, there is no research to date evaluating skin temperature (Tsk) and core temperature (Tc) differences during rapid heat stress (RHS). RHS is an uncompensable form of heat stress that occurs while wearing firefighter personal protective equipment (PPE) in the heat and results in double the heat stress load per minute compared to normothermic conditions. PURPOSE: To assess the differences between Tsk and Tc during RHS. METHODS: 12 subjects (mean 34.62 ± 10.26 years) performed a steady state exercise protocol to the termination point of Tc 39 °C while in firefighter PPE in an environmental chamber. Tsk was recorded at the time points at which the subjects reached Tc 37.5 °C, Tc 38 °C, Tc 38.5 °C, and Tc 39 °C. Tsk and Tc values were compared at each point to determine if differences existed. RESULTS: There was no difference between Tsk and Tc at the time points associated with Tc 37.5 °C and Tc 39 °C. There were differences between Tsk and Tc at the time points associated with Tc 38 °C (Tsk mean: 38.34 + 0.50 °C, p < 0.05) and Tc 38.5 °C (Tsk mean: 38.89 + 0.55 °C, p < 0.05). CONCLUSIONS: Although speculative, these results suggest that early in the RHS bout, the body has the ability to move heat effectively to the periphery to expel heat into the microclimate between the subject at the PPE. At this point, the microclimate is relatively low in humidity and temperature. This results in the maintenance of Tsk and Tc values. As RHS continues, the core continues to move heat to the periphery resulting in an excessively humid and hyperthermic microclimate due to the lack of permeability in the PPE. This creates higher Tsk values in comparison to Tc values at the time points associated with Tc 38 °C and 38.5 °C. Finally, at the termination of the RHS bout (Tc 39 °C), Tsk and Tc equate due to a non-optimal temperature and humidity gradient between the core and microclimate within the PPE. This creates an uncompensable heat stress environment where the microclimate can no longer support thermoregulation. Supported by Louisiana Biomedical Research Network (LBRN) Pilot Project Funding" @default.
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• W4387053575 date "2023-09-01" @default.
• W4387053575 modified "2023-09-27" @default.
• W4387053575 title "The Relationship Between Skin Temperature And Core Temperature During Rapid Heat Stress" @default.
• W4387053575 doi "https://doi.org/10.1249/01.mss.0000982420.67972.be" @default.
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