Plasma Catecholamine Response to Exercise and Cold Adaptation.
DEFENCE AND CIVIL INST OF ENVIRONMENTAL MEDICINE DOWNSVIEW (ONTARIO)
Pagination or Media Count:
Male rats were administered light, moderate, and heavy exercise programs for 3 weeks. Following the exercise programs, the nonexercised control and the three exercised groups were administered a cold-tolerance test at -20C for 3 hr. At the end of 3 hr the mean colonic temperature of the nonexercised group was 31.9C while those of the exercised animals were 35.7-36.5C. All groups exposed to -20C showed significant increases in plasma norepinephrine, epinephrine, and corticoterone when compared to a second nonexercised control group which was sacrificed at 25C P 0.01. Within the cold-exposed groups, the exercised animals exhibited plasma catecholamine and corticosteroid levels that were significantly lower than the nonexercised group P 0.01. The findings indicate that physical training enhances cold tolerance in rats. Modified author abstract
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