Predicting heart rate response to work,

20 l-204. 1973.-Formulas are presented for the prediction of the heart rate response to work, environment, and clothing. These formulas, derived from rectal temperature responses, pre-dict the dynamic response pattern of heart rate with time of exposure, not only for a constant activity and environment but also with varying activity, environment, and clothing during an exposure. The accuracy of the prediction has been checked by comparison with experimental results from several studies at different laboratories and under a wide range of conditions. The predicted value is usually well within one standard error of the actual experimental mean response of a small group of heat-acclimatized subjects (e.g., n = 8). heat stress; cardiac output; sweat efficiency HEART RATE RESPONSE to various work levels and environ-mental heat stress has been studied in numerous experi