On the basis that prolonged occupational exposures in hot environments should not result in heat-specific elevation of body temperature (beyond the work-specific set point), upper limits meeting this criterion were sought in multiple exposure of 10 acclimatized male volunteers. From observations of the critical ambient water vapor pressure at which rise in temperature occurred under 10 combinations of work and air speed, coefficients descriptive of prevailing evaporative cooling were derived. The coefficient when clothed was 62% of that when seminude. Formulas which predict safe limits were derived using the mean coefficient values and their standard deviations such that approximately 95% of this type of population should be projected. Responses of body temperature, heart rate, and sweat rate are given for various exposures.
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