Acclimatization to cold in man induced by frequent scuba diving in cold water.

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Abstract
Three scuba divers, members of an archeological-biological underwater team working in the Svalbard area, 79 [degree]N, established a short-time adaptation to cold as a result of extensive diving in the cold sea. At intervals during a period of 45 days they were tested physiologically under standardized conditions in a cold bath. The results obtained from the tests seem to indicate the following pattern of successive acclimatization: unacclimatized stage-cold stress is met with by an elevated metabolic rate compensating heat loss, intermediate stage there is a fall in the rectal (core) temperature as heat loss is not fully compensated for by metabolism, believed to be caused by habituation of the CNS [central nervous system] acclimatized stage-a constant rectal temperature is maintained, although minor metabolic heat is produced. Conservation of heat is attributed to lowered heat transfer with the blood to the body surf ace.

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