Figure 3.
Empirically derived critical wet-bulb temperatures above which heat balance cannot be maintained (uncompensable heat stress) during minimal activity experiments performed by a sample of 48 young (18–34 yrs) men and women in warm, humid environments. The subject sample included a wide range of body weights, surface areas, and fitness levels (20). The critical wet-bulb temperature was relatively consistent across this range of hot, humid environments but well below the theorized Twb threshold of 35°C.