ENERGY METABOLISM IN COLD-STRESSED FEMALES: IMPLICATIONS FOR PREDICTIVE MODELING

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Authors
  1. Jacobs, I.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);Army Medical Research and Materiel Command, Fort Detrick MD (US)
Abstract
This document is a progress report which describes the results from the first of a series of studies carried out to clarify the extent of gender-related differences in physiological responses to cold stress, and to evaluate the potential implications for survival time in the cold. Specifically, this study was designed to clarify the quantity and quality of energy substrate utilization in shivering female subjects during cold water immersion. The objectives were: to determine the magnitude of metabolic heat production during cold water immersion; to quantify the relative contributions of fat, carbohydrate and protein metabolism to fueling metabolism; to determine if muscle glycogen is a significant energy source during shivering; to manipulate skeletal muscle glycogen availability and to determine the subsequent effects on metabolic rate and body temperature regulation during cold stress. Female subjects were immersed to the neck in 18C water for up to 90 minutes. Their metabolic rate incraesed to about 3 times resting levels, similar to what was reported previously for male subjects. About 40% of the metabolic heat production during immersion was fueled by oxidation of carbohydrates, somewhat less than what was reported for male subjects. TRUNCATED
Keywords
Water immersion;Substrates;Muscle glycogen;Carbohydrate oxidation
Report Number
DCIEM-98-CR-38 — Contractor Report
Date of publication
01 Oct 1997
Number of Pages
58
DSTKIM No
98-02754
CANDIS No
509677
Format(s):
Hardcopy;Document Image stored on Optical Disk

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