Journal of Applied Physiology Millar Instruments
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J Appl Physiol 38: 1073-1077, 1975;
8750-7587/75 $5.00
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Journal of Applied Physiology, Vol 38, Issue 6 1073-1077, Copyright © 1975 by American Physiological Society

ARTICLES

Effect of behavioral variables on cooling rate of man in cold water

J. S. Hayward, J. D. Eckerson and M. L. Collis

Five different behaviors of man while in cold ocean water (9-10 degrees C) were assessed for their effect on rate of progress into hypothermia. With subjects wearing lifejackets, two thermally protective behaviors were studied which reduce exposure to the water of areas of body surface with high relative heat loss potential. One was huddling of three persons and the other a self-huddle behavior (HELP or Heat Escape Lessening Posture). These two behaviors resulted in significant reductions of rectal temperature cooling rate of 66 per cent and 69 per cent, respectively, of that of a control behavior. With no flotation available, two survival swimming behaviors (treading water and drownproofing) were shown to result in significant increases in cooling rate to 134 per cent and 182 per cent, respectively, of the control behavior. Potential swimming distance of subjects wearing a life-jacket was 0.85 miles in water near 12 degrees C before predicted incapacitation by hypothermia. It was concluded that behavioral variables can be of major importance in determining survival time in cold water through modulation of cooling rate associated with other variables such as fatness, body size, and clothing.


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G. G. Giesbrecht, T. L. Lockhart, G. K. Bristow, and A. M. Steinman
Thermal effects of dorsal head immersion in cold water on nonshivering humans
J Appl Physiol, November 1, 2005; 99(5): 1958 - 1964.
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