Fig. 2.

A The predictive value of average skin and core temperature on physical work capacity in the heat. Skin temperature was a strong predictor of physical work capacity (R² = 0.68), whereas core temperature had no predictive value. B Average core temperature and sweat rate response in each trial. There was no relationship with core temperature and WBGT since work output decreases as WBGT increases. The group average sweat rate showed a modest increase with WBGT. C Average skin temperature plotted against WBGT and UTCI. Data for SOLAR and SHADE can share parameter values for intercept and slope, resulting in a single regression line. D Average skin temperature response plotted against Humidex, Heat Index, and Wet Bulb Temperature. Data for SOLAR and SHADE cannot share parameter values since these heat stress indices do not account for solar radiation. Therefore, separate regression lines are required for each dataset