Abstract: In order to study the thermophysiological response of firefighters during training and rescue operations in high-temperature environments, this paper constructs a thermophysiological model applicable to firefighting and rescue operations based on the human body's thermoregulatory mechanism, correcting the surface area of the human body, the performance of the clothing, and the convective heat transfer coefficient of the human body and the environment in the two-node model, as well as controlling the maximal blood flow rate, and selecting the skin and core tuning temperatures. The predictive accuracy of the improved thermophysiological model was verified by comparative analysis with human thermophysiological test data in the literature, and the verified model was used to predict the core temperatures and safe sustained operating time of firefighters in high-temperature environments (40 °C and 60 °C). The results showed that: under four different test conditions, the maximum error between the simulated value and the test value of core temperature and skin temperature did not exceed 1.24 ℃ and 1.57 ℃ respectively, and the constructed thermophysiological model had a high reliability; it was found that, by predicting the change of the core temperature of firefighters under two high-temperature conditions (40 ℃, 50% relative humidity; 60 ℃, 50% relative humidity), the longest time for rescue personnel to safely continue the operation under 40 ℃ and 60 ℃ is 12 min and 6 min, respectively.

Key words: firefighters, high temperature environment, thermal physiology model, core temperature, skin temperature