Circabidian rhythm: its appearance and disappearance in association with a bright light pulse.
A shift from circadian to circabidian periods or vice versa was observed in the rhythm of sleep and wakefulness under temporal isolation. The shift occurred in two subjects, 3 times in association with a single bright light pulse applied, 4 times in all. The finding suggests that the bright light pulse has an additional effect to the phase shift on the human circadian system.
Honma
K
K
Department of Physiology, Hokkaido University School of Medicine, Sapporo, Japan.
Honma
S
S
D000328:Adult; D001683:Biological Clocks / Q000528:radiation effects*; D001831:Body Temperature; D002940:Circadian Rhythm / Q000528:radiation effects*; D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D010507:Periodicity; D012890:Sleep / Q000528:radiation effects; D014851:Wakefulness / Q000528:radiation effects