Protective clothing can readily convert a tolerable long-term working condition into a situation in which exposure time is limited by rapidly accumulating heat strain (Kraning and Gonzalez, 1991). It is a challenge to produce simple and universal exposure guidelines for those administrating activities of personnel because effects of different clothing types, workloads and environmental conditions on the expected physiological responses are complex. To reduce uncertainties in estimating safe exposure times, ...
This report describes a new computer simulation of human temperature regulation for predicting limiting physiological responses to work under heat stress. Possible military applications include adjustment of work: rest cycles during intermittent work in protective clothing or confined spaces and determining optimal recovery periods and environments following exercise and/or exposure to hot environments. Using data bases from 7 independent studies of widely varying workload and environment, the simulation was validated ...
Time-weighted averaging is a method employed in heat stress analyses to consolidate the rate of heat production (M) from complex intermittent exercise patterns into a single continuous level of heat production. Physiological responses during intermittent and continuous exercise were studied in 4 subjects exposed to heat stress in which evaporation was either free or severely restricted. Intermittent work consisted of repeated 10 min exercise/ rest patterns. Continuous work was at ...
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