Accession Number:

ADA169779

Title:

Human Thermoregulatory Model for Immersion in Cold Water,

Descriptive Note:

Corporate Author:

ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Report Date:

1986-06-01

Pagination or Media Count:

35.0

Abstract:

A mathematical model of thermoregulation has been developed to simulate human physiological responses to cold-water immersion. Data were obtained from experiments where thirteen healthy male volunteers were totally immersed under resting and nude conditions for 1 h in water temperatures of 20 and 28 C. Mean measured rectal temperature T sub re fell by about 0.9 and 0.5 C in 20 and 28 C water for all subjects, yet mean measured metabolic rate M rose by about 275 and 90 W for the lean mass group n7 and 195 and 45 W for the normal mass group n6. To predict the observed T sub re and M values, the present model differed from its predecessors by a determining a thermally neutral body temperature profile such that the measured and predicted initial values of T sub re and M were matched, b including thermal inputs for shivering from the skin independent of their inclusion with the central temperature to account for the observed initial rapid rise in M, c confining the initial shivering to the trunk region to avoid an overly large predicted initial rate of rectal cooling, and d calculating the steady state of convective heat loss by assuming a zero rate of heat storage in the skin compartment.

Subject Categories:

  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE