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Heat strain: biophysical and physiological evaluation.
John B. Pierce Foundation Laboratory, New Haven, Connecticut, Terminal Progress Report, 1981 Jan; :1-7
The degree of thermal strain attributable to changes in environmental stress were assessed as they relate to the success or failure of various thermoregulatory mechanisms in the body. Various experimental studies were briefly cited. It has been possible on a psychrometric chart to describe loci of constant effective temperatures, skin wettedness, mean skin and body temperatures, skin evaporation as well as to categorize sensations of discomfort and temperature that would be expected after 1 hour exposure for a sedentary subject when normally clothed in still air. General relationships for sedentary clothed subjects also apply to exercising subjects, but with certain quantitative differences. It has also been possible to measure the local skin humidity characteristics with newly developed miniature automatic dew point sensors. Another study examined an experimental model applicable to clothing and tents used under such conditions. Other research evaluated a two node thermoregulatory model for predicting sensory responses while working in the heat. Cardiorespiratory and thermoregulatory responses were also investigated using both trained and untrained subjects under various conditions. The findings from these various studies suggest that a physically fit individual is more heat tolerant, persons aged 18 to 47 years are more heat tolerant, and the fabric called Gortex may prove successful in combating clothing enhanced heat stress. A standardized heat stress scale for gauging age related endurance levels was developed.
NIOSH-Grant; Hot-environments; Heat-stress; Heat-tolerance; Heat-exposure; Heat-exhaustion; Climatic-effects; Physiological-response; Age-factors; Workplace-studies
None John B Pierce Fdn Laboratory 290 Congress Avenue New Haven, Conn 06519
Final Grant Report
NTIS Accession No.
John B. Pierce Foundation Laboratory, New Haven, Connecticut, Terminal Progress Report
John B. Pierce Foundation Lab, Inc., New Haven, Connecticut
Page last reviewed: February 18, 2022
Content source: National Institute for Occupational Safety and Health Education and Information Division