Cited by 81Circadian rhythm and melatoninSleep and Work-Related FatigueSleep and Wakefulness Research

Effects of nocturnal bright light on saliva melatonin, core body temperature and sleep propensity rhythms in human subjects

Kubota, Tomio, Uchiyama, Makoto, Suzuki, Hiroyuki, Shibui, Kayo, Kim, Keiko, Tan, Xin, Tagaya, Hirokuni, Okawa, Masako +1 more·2002·Neuroscience Research

Abstract

Nine healthy male volunteers (mean age of 24) participated in two experimental sessions of random crossover design: a bright light (5000 lux for 5 h from 00:00 to 05:00 h) session and a dim light (10 lux for 5 h from 00:00 to 05:00 h) session. Subsequently participants entered an ultra-short sleep-wake schedule for 26 h, in which a sleep-wake cycle consisting of 10-min sleep EEG recording on a bed and 20-min resting awake on a semi-upright chair were repeated. Saliva melatonin level and core body temperature was measured throughout the experiment. Bright light significantly delayed rhythms of melatonin secretion (01:58 h), core body temperature (01:12 h) and sleep propensity (02:00 h), compared as dim light session. Significant positive correlation was found between bright light-induced phase change in core body temperature and that in sleep propensity rhythm. Light-induced melatonin suppression significantly positively correlated with the phase change in core body temperature and that in sleep propensity rhythm. Assuming that light-induced melatonin suppression represents an acute impact of light on the circadian pacemaker, our results suggest that such an impact may be directly reflected in phase changes of sleep propensity and core body temperature rhythms rather than in melatonin rhythm.

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Crossref · 10.1016/s0168-0102(01)00310-8

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Authors
Kubota, T., Uchiyama, M., Suzuki, H., Shibui, K., Kim, K., Tan, X., Tagaya, H., Okawa, M., & Inoué, S.
Affiliations
  • Tokyo Medical and Dental University (JP)
  • National Center of Neurology and Psychiatry (JP)
  • Shiga University of Medical Science (JP)
Corresponding author
Uchiyama, Makoto
Venue
Neuroscience Research
Publisher
Elsevier BV
Published
2002-02
Volume
42
Issue
2
Pages
115-122
ISSN
0168-0102 (ISSN-L)
OpenAlex
W1995119419
Cited by
80
References
50
Citations by year
2026: 2 · 2025: 3 · 2024: 2 · 2023: 2 · 2022: 6 · 2021: 2 · 2020: 1 · 2019: 5 · 2018: 5 · 2017: 3 · 2016: 6 · 2015: 2 · 2014: 6 · 2013: 7 · 2012: 2
FWCI
1.37
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience Research (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
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
Keywords
melatonin secretion, core body temperature, sleep propensity, circadian rhythm, phase shift, melatonin suppression, circadian pacemaker, light exposure
MeSH terms
Adult, Body Temperature, Circadian Rhythm, Humans, Lighting, Male, Melatonin, Saliva, Sleep Stages, Cross-Over Studies

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