Seasonal variation of digital vascular hunting reactions to cold air.

概要

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Fifteen male students at Kobe University were served as subjects. Experiments were carried out around 3 p.m. They were requested not to eat any food and to rest at least for 2 hours prior to the experiment. They took a rest on a chair for 30 minutes at room temperature controlled to 20-22°C. Then, they put their left hand up to the wrist with the palm downward and with fingers extended slightly in the cold chamber at -10°C. The skin temperature of the palmar surface of the distal phalanx of the middle finger was measured continuously with a copperconstantan thermocouple; the measurements were made for 5 minutes at room temperature, for 30 minutes in cold exposure and again for 20 minutes at room temperature.<BR>Results were follows. The skin temperature at the first rise (TFR) was the highest in the summer and was the lowest in the winter (P<0.01) . Mean skin temperature (MST) and the lowest skin temperature (LT) during the cold exposure showed results similar to the above (P<0.001) . However, time for the first temperature rise (TTR) did not vary significantly at all seasons. When the skin temperature before cold exposure was the same, TFR and MST were the highest in the summer. But TTR had no seasonal variation. Subjects complained of cold pain when MST was below 15°C. The results of hunting reactions were obtained more clearly in the following sequence of seasons; Summer>Autumn>Spring>Winter.
日本生気象学会の論文