Evidence and Meaning of Acclimatization to Cold in Man

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Abstract
Evidence of acclimatization was observed in soldiers exposed for 4 months to Arctic winter climate and frequently experiencing thermal discomfort. This was evidenced by exposing these subjects three times through the winter to the same standard cold stress. At the end of the winter the increased heat production caused by this standard cold exposure was not as large as in the fall. Since the same observations were made by different workers on laboratory animals, this result is interpreted as evidence of acclimatization to cold. The hypothesis of Carlson and his associates that acclimatization is effected by a decreased 'core' and an increased 'shell' of the body is not completely substantiated by our results. It is suggested that acclimatization is associated with a lowering of the body 'thermostat' to more economical levels. Submitted on April 17, 1956
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