DS/ISO 7933:2023

This document describes a model [the predicted heat strain (PHS) model] for the analytical determination and interpretation of the thermal stress (in terms of water loss and rectal temperature) experienced by an average person in a hot environment and determines the maximum allowable exposure times within which the physiological strain is acceptable for 95% of the exposed population (the maximum tolerable rectal temperature and the maximum tolerable water loss are not exceeded by 95% of the exposed people).