Accession Number : AD0639608

Title :   PHYSIOLOGIC MECHANISMS OF MAINTAINING THERMAL BALANCE IN HIGH PRESSURE EVIVIORONMENTS.

Descriptive Note : Research rept.

Corporate Author : NAVAL MEDICAL RESEARCH INST BETHESDA MD

Personal Author(s) : RAYMOND,Lawrence W.

Report Date : 1966

Pagination or Media Count : 30

Abstract : The review of body temperature control aims to define the optimal enviroment for deep submergence habitats, at pressures of 15-20 atmospheres. Environmental factors demand major attention since they will largely dicate the physiologic adjustments which will be required. Inherent changes in gas composition and density indicate major increases in surface heat transfer, depending upon atmospheric temperature and movement. Habitat insulation and ocean temperature suggest that body surface heat transfer will also be increased by radiation, but this may be modified by heating techniques, special insulation methods or by treatment of cold habitat surfaces. Humidity may be an important determinant of comfort and skin hygiene. Psychrometric methods for hyperbaric atmospheres are discussed. Experimental data on body heat transfer in helium-rich environments are presented from simulation studies. The data confirm a major increase in convective heat transfer from the skin, in helium at increased pressures. The implications of these findings upon physiologic and environmental aspects of these findings upon physiologic and environmental aspects of deep submergence programs are discussed. (Author)

Descriptors :   (*BODY TEMPERATURE, *DEEP SUBMERGENCE), PRESSURE, CONTROL, UNDERWATER, DIVING, HELIUM, HEAT TRANSFER, OXYGEN CONSUMPTION, METABOLISM, ADAPTATION(PHYSIOLOGY), PERFORMANCE(HUMAN)

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE