PA1-4 Effects of Mild Cold Exposure on Sleep Stages and Body Temperature in Women with Cold Constitutions (Hiesho)

• Published in: Journal of PHYSIOLOGICAL ANTHROPOLOGY 2007, Vol.26 (2), p.288-288
• Main Authors: Kazue OKAMOTO-MIZUNO, Koh MIZUNO, Mituaki YAMAMOTO, Yukari YAMASHIRO, Yoshinao NAGASHIMA, Yukihiro YADA, Shuichiro SHIRAKAWA
• Format: Article
• Language: Japanese
• ISSN: 1880-6791

The purpose of this study was to investigate the effects of mild cold exposure on sleep stages and body temperature during nap in young Japanese woman with cold constitutions (known as “hiesho”). The subjects included twelve women who complained of hiesho (H) and twelve control women(C). The subjects wore long-sleeve pajamas and shorts and slept from 1430 to 1600 with a blanket and quilt, on a bed covered with a sheet. A climate chamber that was maintained at 15℃ RH60%. Electroencephalogram (EEG), electrooculogram (EOG), and mental electromyogram (EMG) recordings, rectal temperature and skin temperature were continuously measured. The subjective sensation was asked before and after sleep. No significant difference was observed in sleep onset latency and other sleep stage onset latency. Wakefulness tended to increase and stage 2 significantly decreased in H than in C. The leg skin temperature increase was significantly delayed in H than in C. Further, rectal temperature decline was significantly delayed in H than in C. The subjective sensation was significantly colder in foot, hand and whole body in H than in C. These results suggest that increased colder sensation, delayed leg skin temperature increase and delayed rectal temperature decline may have led to an increased tendency in wakefulness and decreased stage 2 in H than in C.