RESPIRATORY HEAT LOSS DURING WORK AT VARIOUS AMBIENT TEMPERATURES

Authors
  1. Cain, J.B.
  2. Livingstone, S.D.
  3. Nolan, R.W.
  4. Keefe, A.A.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The purpose of this investigation was to establish the temperature and humidity of the expired air of subjects working at various metabolic rates at ambient temperatures between -40C and 20C in order to calculate respiratory heat loss. Measurements of the respired air temperature and water vapour content were made for five subjects while they either stood or walked on a treadmill. The results indicated that the maximum respired air temperature varied slightly with the ambient air temperature but changes in metabolic rate, respiration rate and breathing frequency had no apparent effect on the expired air temperature under the conditions studied. The relative humdity of the respired air was found to be close to saturation in the extreme-cold environments. Heat loss due to respiration was between 25 and 30% of the resting metabolic and between 15 and 20% of the working metabolic rate.
Date of publication
15 Jul 1989
Number of Pages
6
Reprinted from
Respiration Physiology, no 79, 1990, p 145-150
DSTKIM No
90-02392
CANDIS No
64654
Format(s):
Hardcopy;Originator's fiche received by DSIS

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