Cited by 946Circadian rhythm and melatoninSleep and Work-Related FatigueImpact of Light on Environment and Health

Bright Light Induction of Strong (Type 0) Resetting of the Human Circadian Pacemaker

Czeisler, Charles A., Kronauer, Richard E., Allan, James S., Duffy, Jeanne F., Jewett, Megan E., Brown, Emery N., Ronda, Joseph M.·1989·Science

Abstract

The response of the human circadian pacemaker to light was measured in 45 resetting trials. Each trial consisted of an initial endogenous circadian phase assessment, a three-cycle stimulus which included 5 hours of bright light per cycle, and a final phase assessment. The stimulus induced strong (type 0) resetting, with responses highly dependent on the initial circadian phase of light exposure. The magnitude and direction of the phase shifts were modulated by the timing of exposure to ordinary room light, previously thought to be undetectable by the human pacemaker. The data indicate that the sensitivity of the human circadian pacemaker to light is far greater than previously recognized and have important implications for the therapeutic use of light in the management of disorders of circadian regulation.

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Crossref · 10.1126/science.2734611

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57 of 57 references verified0 citation errors · 0 not checkable

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  • In the cortisol profile, the end of the quiescent period and the onset of the daily rise are mostly under the control of circadian rhythmicity, while the timing of the acrophase and the amplitude of the diurnal variation are more influenced by sleep-wake transitions.

    “In the cortisol profile, the end of the quiescent period and the onset of the daily rise are mostly under the control of circadian rhythmicity, while the timing of the acrophase and the amplitude of the diurnal variation are more influenced by sleep-wake transitions.”
  • In studies of real and simulated jet-lag, the synchronization of the acrophase to the new clocktime occurred faster than the adaptation of the quiescent period.

    “Indeed, in studies of real and simulated jet-lag, the synchronization of the acrophase to the new clocktime occurred faster than the adaptation of the quiescent period [14, 66].”

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Authors
Czeisler, C. A., Kronauer, R. E., Allan, J. S., Duffy, J. F., Jewett, M. E., Brown, E. N., & Ronda, J. M.
Affiliations
  • Brigham and Women's Hospital (US)
  • Harvard University (US)
Venue
Science
Published
1989-06-16
Volume
244
Issue
4910
Pages
1328-1333
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W2029323550
Cited by
946
References
57
Citations by year
2026: 9 · 2025: 15 · 2024: 14 · 2023: 19 · 2022: 25 · 2021: 20 · 2020: 26 · 2019: 24 · 2018: 21 · 2017: 25 · 2016: 19 · 2015: 17 · 2014: 23 · 2013: 17 · 2012: 28
FWCI
22.43
Type
journal article
Language
en
Open access
closed
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (2s07rr005950-07)
  • National Institute on Aging (R01AG006072, 1-RO1-AG06072)
  • National Center for Research Resources (5 M01-RR-00888, 2-S07-RR05950)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Physical Sciences › Environmental Science › Global and Planetary Change › Impact of Light on Environment and Health
Keywords
circadian pacemaker, light-induced phase shift, bright light exposure, phototherapy, circadian rhythm disorders, photoperiod
MeSH terms
Adult, Circadian Rhythm, Humans, Male, Models, Biological, Phototherapy, Time Factors

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