Accession Number:
ADA169779
Title:
Human Thermoregulatory Model for Immersion in Cold Water,
Descriptive Note:
Corporate Author:
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
Personal Author(s):
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.
Descriptors:
- *HYPOTHERMIA
- MATHEMATICAL MODELS
- STEADY STATE
- TEMPERATURE
- LOW TEMPERATURE
- HUMANS
- WATER
- MASS
- VOLUNTEERS
- RATES
- COOLING
- METABOLISM
- PHYSIOLOGICAL EFFECTS
- LIQUID IMMERSION TESTS
- TEMPERATURE CONTROL
- MALES
- VALUE
- RESPONSE(BIOLOGY)
- STORAGE
- CONVECTION(HEAT TRANSFER)
- HEAT
- SKIN(ANATOMY)
- HEAT LOSS
- BODY TEMPERATURE
- RECTUM
- SHIVERING
Subject Categories:
- Stress Physiology