Accession Number:

ADA050008

Title:

Heat Stress, Work Function and Physiological Heat Exposure Limits in Man

Descriptive Note:

Medical research progress rept.

Corporate Author:

NAVAL MEDICAL RESEARCH INST BETHESDA MD

Personal Author(s):

Report Date:

1977-02-01

Pagination or Media Count:

32.0

Abstract:

Various operational trials using tolerance criteria available in the literature revealed that predictions of physiological exposure limits were rarely compatible with the observed status of men in a wide range of heat stress and work conditions. Computer integration of laboratory and industrial-type data led to establishing a comprehensive set of physiological criteria for tolerance limits appropriate to man at work within time-weighted-mean twm metabolic rates. These criteria and work rates were integrated with industrial-type heat stress conditions which resulted in developing the Physiological Heat Exposure Limits PHEL concept. Several electronic heat stress monitor-devices were evaluated and employed in determining environmental conditions. Comparison of over 200 sets of environmental and physiological data supported the PHEL concept and permitted more definitive identification of material areas requiring corrective engineering actions in the industrial-type settings. Corrective engineering actions based upon results of the data analyses have permitted nearly a sixfold increase of the maximum physiological exposure times simultaneously, the estimated cardiovascular reserve increased from 15 to as much as 85 during routine work.

Subject Categories:

  • Stress Physiology
  • Human Factors Engineering and Man Machine Systems
  • Environmental Health and Safety

Distribution Statement:

APPROVED FOR PUBLIC RELEASE