Comparison of Vascular Hunting Reaction and Cold Tolerance Between Subtropical and Temperate Natives
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概要
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Vascular hunting reaction was observed on 20 young male university students born and raised in the Japan Main Island, temperate zone (group M) and 5 young male unversity students born and raised in Okinawa, subtropical zone, but moved to the Japan Main Island in less than three years (group O) . Whole body cold tolerance test were made on 15 subjects in group M and 5 subjects in group O. Two series of experiments were performed in Nishinomiya. The first series of experiments was performed in July on subjects in groups M and subjects in group O before returning to Okinawa (experiment B) . The second series of experiments was performed in September on subjects in group O after a month's stay in Okinawa in August (experiment A) . Vascular hunting reaction was observed by dipping left middle finger with a thermocouple attached to the nail bed into stirring ice water for 30 min. and changes in skin temperature were measured continuously. Whole body cold tolerance test was performed on the subjects clothed with 1.8 clo by taking off a blanket after covering with a blanket in the supine position in a room of 10°C with 70% R.H. and wind velocity of 17 cm/sec. Physiological responses of the subjects to cold were observed for 60 min. Skin temperatures at 6 sites were recorded continuosly during cold exposure and metabolic rates were measured at 30 and 60 min. In experiment B, group O showed slightly higher mean skin temperature, higher temperature of first rise after immersion and significantly longer time for first temperature rise after immersion than group M. In experiment A, group O showed considerably higher mean skin temperature, higher temperature for first rise and significantly longer time for first rise than groups M and O in experiment B. Vascular hunting reaction of subtropical natives was characterized with long latent time for hunting reaction in spite of essentially the same level of skin temperature and latent time was lengthened after returning to Okinawa. In experiment B, group O showed slightly smaller drop in skin temperature and greater increase in metabolic rate at the end of experiment than proup M. In experiment A, group O showed considerably lesser drop in skin temperature, significantly greater increase in metabolic rate and greater frequency of shivering at 30 min. after cold exposure when compared with those in groups M and 0 in experiment B. Thus, cold tolerance of subjects in group O was reduced by returning to Okinawa in summer.
- 日本生気象学会の論文
日本生気象学会 | 論文
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