Cited by 560Circadian rhythm and melatoninSleep and Work-Related FatigueImpact of Light on Environment and Health

Dose-response relationships for resetting of human circadian clock by light

Boivin, Diane B., Duffy, Jeanne F., Kronauer, Richard E., Czeisler, Charles A.·1996·Nature

Abstract

Since the first report in unicells, studies across diverse species have demonstrated that light is a powerful synchronizer which resets, in an intensity-dependent manner, endogenous circadian pacemakers. Although it is recognized that bright light (approximately 7,000 to 13,000 lux) is an effective circadian synchronizer in humans, it is widely believed that the human circadian pacemaker is insensitive to ordinary indoor illumination (approximately 50-300 lux). It has been proposed that the relationship between the resetting effect of light and its intensity follows a compressive nonlinear function, such that exposure to lower illuminances still exerts a robust effect. We therefore undertook a series of experiments which support this hypothesis and report here that light of even relatively low intensity (approximately 180 lux) significantly phase-shifts the human circadian pacemaker. Our results clearly demonstrate that humans are much more sensitive to light than initially suspected and support the conclusion that they are not qualitatively different from other mammals in their mechanism of circadian entrainment.

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Crossref · 10.1038/379540a0

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Authors
Boivin, D. B., Duffy, J. F., Kronauer, R. E., & Czeisler, C. A.
Affiliations
Brigham and Women's Hospital (US)
Venue
Nature
Published
1996-02
Volume
379
Issue
6565
Pages
540-542
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2072214097
Cited by
559
References
24
Citations by year
2026: 12 · 2025: 14 · 2024: 10 · 2023: 12 · 2022: 32 · 2021: 24 · 2020: 25 · 2019: 25 · 2018: 13 · 2017: 16 · 2016: 20 · 2015: 18 · 2014: 20 · 2013: 14 · 2012: 24
FWCI
7.84
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
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 clock, light exposure, phase shift, circadian entrainment, light intensity, dose-response relationship, indoor lighting, photosensitivity
MeSH terms
Adult, Body Temperature, Circadian Rhythm, Dose-Response Relationship, Radiation, Humans, Light, Male

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