Effects of short wavelength control in polychromatic light sources on nocturnal melatonin secretion

Tomoaki Kozaki, Shota Koga, Naohiro Toda, Hiroki Noguchi, Akira Yasukouchi

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

In this study, 12 healthy males were exposed to various light conditions (2300 K, 3000 K, 5000 K and dim) for 1.5 h at midnight. The conditions of 3000 K and 5000 K were created by commercial fluorescent lamps. The light at 2300 K was achieved by fitting a 3000 K fluorescent lamp with a special filter that absorbed short-wavelength light. The vertical illuminance level was kept at 200 lx. Saliva samples were taken before and after the light exposure. The light at 5000 K suppressed melatonin secretion acutely. The 2300 K lamp condition appeared to have no effect on melatonin secretion as well as the dim condition, while melatonin secretion was measurably suppressed by the light at 3000 K.

Original languageEnglish
Pages (from-to)256-259
Number of pages4
JournalNeuroscience Letters
Volume439
Issue number3
DOIs
Publication statusPublished - Jul 18 2008

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

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