Tolerance of men working in hot, humid environments

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Abstract
Tolerance of acclimatized men working in eight hot, humid environments was studied. Results show that the upper limits for completion of 3 hr of work at a caloric expenditure of 350 kcal/hr are dry bulb (DB) 95 F and wet bulb (WB) 90 F. Rectal temperature is not a good indicator of tolerance under the conditions of our study, while skin temperature and heart rate are. A good relationship is evident between the rapid changes in skin temperature during work (first 10 min of exposure) and tolerance time; thus, these rapid changes may be used to predict tolerance time. Of the physical indexes of thermal stress the best relationship was established between WD (WD = 0.15 DB and 0.85 WB) and tolerance time. body temperature; tolerance to heat; tolerance to humidity; skin temperature; temperature regulation Submitted on June 8, 1964

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