Peripheral cold acclimatization in Antarctic scuba divers.
Peripheral acclimatization to cold in scuba divers stationed at the British Antarctic Survey's Signy Station was investigated during a year in Antarctica. Five divers and five non-diver controls underwent monthly laboratory tests of index finger immersion in cold water for 30 min. Index finger pulp temperature and time of onset of cold-induced vasodilatation (CIVD) were measured. Pain was recorded with verbal and numerical psychophysical subjective pain ratings. Average finger temperatures and median finger pain from 6-30 min of immersion, maximum finger temperatures during the first CIVD cycle, and finger temperatures at the onset of CIVD were calculated. Comparison of the variables recorded from divers and non-divers were performed with analysis of variance. No significant differences were found among the variables recorded from divers and non-divers. From a review of the literature, divers have responses typical of non-cold-adapted Caucasians. There is, therefore, no evidence that Signy divers peripherally acclimatized to cold. We suggest that these findings occur because either the whole body cooling which divers undergo inhibits peripheral acclimatization or because of insufficiently frequent or severe cold exposure while diving. Further basic studies on the duration, frequency and severity of cold exposure necessary to induce peripheral cold acclimatization are required before this question can be satisfactorily answered.
Bridgman
S A
SA
British Antarctic Survey, Cambridge, England.
D000064:Acclimatization / Q000502:physiology*; D000328:Adult; D000704:Analysis of Variance; D000864:Antarctic Regions; D003081:Cold Climate; D004242:Diving; D005385:Fingers / Q000098:blood supply / Q000502:physiology*; D006801:Humans; D008297:Male; D012881:Skin Temperature; D014664:Vasodilation