SHIVERING ONSET, METABOLIC RESPONSE, AND CONVECTIVE HEAT TRANSFER DURING COLD AIR EXPOSURE

Authors
  1. Tikuisis, P.
  2. Bell, D.G.
  3. Jacobs, I.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The purpose of the study was to quantify the onset of shivering of various muscles and relate this onset with the increase in metabolic rate and convective heat loss during cold air exposure. Thirteen male subjects resting in a supine position and wearing shorts were exposed to 10C air (42% relative humidity and <0.4 m/s air flow) for 2 h. Measurements included surface EMG recordings at six muscle sites representing the trunk and limb regions of one side of the body, temperatures and heat fluxes at the same contralateral sites, and metabolic rate. The subjects were grouped according to lean (LEAN, n = 6) and average body fat (NORM, n = 7) content. While the rectal temperatures did not change appreciably during exposure, the skin temperatures decreased greatly, more at the limb sites than at the trunk sites. Muscles of the trunk region began to shiver sooner and at a higher intensity than those of the limbs.
Report Number
DCIEM-91-24 — Reprint
Date of publication
01 Jan 1991
Number of Pages
7
Reprinted from
J Appl Physiol, vol 70, no 5, 1991, p 1996-2002
DSTKIM No
91-03747
CANDIS No
70937
Format(s):
Hardcopy;Originator's fiche received by DSIS

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