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J Appl Physiol 63: 2375-2379, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 63, Issue 6 2375-2379, Copyright © 1987 by American Physiological Society

ARTICLES

Effectiveness of three field treatments for induced mild (33.0 degrees C) hypothermia

G. G. Giesbrecht, G. K. Bristow, A. Uin, A. E. Ready and R. A. Jones
Faculty of Physical Education and Recreation Studies, University of Manitoba, Winnipeg, Canada.

Three field applicable treatments for hypothermia were compared. Subjects were cooled in stirred cold water (8.0 degrees C) to a core temperature (Tco) as low as 33 degrees C and rewarmed in a random order by each of three techniques: shivering, external heat, and treadmill exercise. Tco was monitored with an esophageal thermistor probe at the level of the heart. Treatment effectiveness was determined by calculating the amount of Tco afterdrop, length of afterdrop period, rate of Tco increase, and total recovery time. Rate of Tco increase for exercise (4.9 degrees C/h) was significantly higher (P less than 0.05) than shivering (3.5 degrees C/h) but not external heat (3.7 degrees C/h). Exercise afterdrop amount and afterdrop length values (0.95 degrees C and 24 min, respectively) were significantly higher (P less than 0.05) than both shivering (0.33 degrees C, 15 min) and external heat (0.32 degrees C, 14 min). Therefore, although rate of Tco increase during recovery for exercise was faster than for shivering or external heat, as it was preceded by a greater afterdrop length and amount, total recovery time did not differ among the three treatments.


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