Accession Number : AD0784983

Title :   Temperature Requirements for the Maintenance of Thermal Balance in High Pressure Helium Oxygen Environments.

Descriptive Note : Research rept.,

Corporate Author : NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C

Personal Author(s) : Flynn,E. T. ; Vorosmarti,J. , Jr. ; Modell,H. I.

Report Date : 01 JUN 1974

Pagination or Media Count : 49

Abstract : Using a mathematical model of human thermal exchange, the range of environmental temperatures consistent with the maintenance of thermal balance was computed for helium-oxygen dives up to depths of 5000 FSW. In agreement with the trend of empirical data obtained during shallower dives, the required environmental temperature increases progressively with increasing depth while the range of acceptable temperatures decreases. The greatest changes occur in the first 1000 feet of descent. According to the model, sweating will become an ineffective means of extending the upper limit of environmental temperature at depths beyond 2000 feet. Conversely, if chamber temperature falls below the lower limit, body temperature will fall at a rate which becomes more rapid with increasing depth. (Modified author abstract)

Descriptors :   *Stress(Physiology), *Hyperbaric conditions, *Deep diving, *Body temperature, Homeostasis, Mathematical models, Stress(Physiology), Oxygen, Helium, Environments, Metabolism, Thermal conductivity, Sweat cooling, Atmospheric temperature

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE