Experientia

, Volume 43, Issue 11, pp 1205–1207

Phase-dependent shift of free-running human circadian rhythms in response to a single bright pulse

Authors

  • K. Honma
    • Department of PhysiologyHokkaido University School of Medicine
  • S. Honma
    • Department of PhysiologyHokkaido University School of Medicine
  • T. Wada
    • College of Medical Technology
Short Communications

DOI: 10.1007/BF01945525

Cite this article as:
Honma, K., Honma, S. & Wada, T. Experientia (1987) 43: 1205. doi:10.1007/BF01945525

Summary

Responsiveness of free-running human circadian rhythms to a single pulse of bright light was examined in a temporal isolation unit. Bright light (5000 lx) of either 3 or 6 h duration, applied during the early subjective day, produced phase-advance shifts in both the sleep-wake cycle and the rhythm of rectal temperature; the light pulse had essentially no effect on the phase of the circadian rhythms, when it was introduced during the late subjective day or the early subjective night. The results indicate that bright light can reset the human circadian pacemaker.

Key words

Human circadian rhythmbright light pulsephase-shifttemporal isolationphase response curve

Copyright information

© Birkhäuser Verlag 1987