Light-induced melatonin suppression at night after exposure to different wavelength composition of morning light

Tomoaki Kozaki, Ayaka Kubokawa, Ryunosuke Taketomi, Keisuke Hatae

研究成果: ジャーナルへの寄稿学術誌査読

27 被引用数 (Scopus)

抄録

Bright nocturnal light has been shown to suppress melatonin secretion. However, bright light exposure during the day might reduce light-induced melatonin suppression at night. The human circadian system is sensitive to short wavelength light. This study evaluated the preventive effect of different wavelengths of daytime light on light-induced melatonin suppression at night. Twelve male subjects were exposed to various light conditions (dim, white, and bluish white light) between the hours of 09:00 and 10:30 (daytime light conditions). They were then exposed to light (300 lx) again between 01:00 and 02:30 (night-time light exposure). Subjects provided saliva samples before (00:55) and after night-time light exposure (02:30). A two-tailed paired t-test yielded significant decrements in melatonin concentrations after night-time light exposure under daytime dim and white light conditions. No significant differences were found in melatonin concentrations between pre- and post-night-time light exposure with bluish-white light. Present findings suggest that daytime blue light exposure has an acute preventive impact on light-induced melatonin suppression in individuals with a general life rhythm (sleep/wake schedule). These findings may be useful for implementing artificial light environments for humans in, for example, hospitals and underground shopping malls to reduce health risks.

本文言語英語
ページ(範囲)1-4
ページ数4
ジャーナルNeuroscience Letters
616
DOI
出版ステータス出版済み - 3月 11 2016

!!!All Science Journal Classification (ASJC) codes

  • 神経科学(全般)

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