1. Seasonal changes in human sleep-wake rhythm in Antarctica and Japan.
- Author
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Usui A, Obinata I, Ishizuka Y, Okado T, Fukuzawa H, and Kanba S
- Subjects
- Adult, Antarctic Regions, Expeditions, Humans, Japan, Male, Circadian Rhythm, Light, Seasons, Sleep Stages
- Abstract
The subjects were eight men of the Japanese Antarctic Research Expedition (average age 35.8 years), and 10 healthy people living around Kofu, Japan (28.9 years). They completed a sleep log for 12 to 18 months, and the sleep-wake state was scored in 10-min epochs. Q24 values calculated by chi2 periodgram were low in the Antarctic midwinter. This means that there was difficulty in synchronizing to a 24-h period in the Antarctic midwinter. In Antarctica, sleep onset and offset times were delayed mostly in the midwinter. In Japan, sleep offset time was delayed mostly around the winter solstice.
- Published
- 2000
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