Relationship between individual difference in melatonin suppression by light and habitual bedtime

Shigekazu Higuchi, Yutaka Motohashi, Takafumi Maeda, Keita Ishibashi

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The purpose of this study was to determine the relationship between individual difference in melatonin suppression by exposure to light and habitual bedtime. Seventeen healthy male students (mean age: 22.6±2.4yr) volunteered to participate in the study. The subjects were exposed to light (1000 1x) for 2 hours from 2 hours before the time of peak salivary melatonin concentration. Two hours after exposure to the light, melatonin suppression had occurred in fifteen subjects. No significant correlation was found between the rate of melatonin suppression and habitual bedtime in the fifteen subjects in whom melatonin suppression occurred. However, the habitual bedtime of the two subjects in whom melatonin suppression did not occur was earlier than that of the other subjects. These results suggest that there are some people with very low sensitivity to light and that this may affect habitual bedtime.

Original languageEnglish
Pages (from-to)419-423
Number of pages5
JournalJournal of physiological anthropology and applied human science
Volume24
Issue number4
DOIs
Publication statusPublished - Jul 1 2005
Externally publishedYes

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Melatonin
suppression
Individuality
Light
Photophobia
Students
student

All Science Journal Classification (ASJC) codes

  • Social Sciences(all)

Cite this

Relationship between individual difference in melatonin suppression by light and habitual bedtime. / Higuchi, Shigekazu; Motohashi, Yutaka; Maeda, Takafumi; Ishibashi, Keita.

In: Journal of physiological anthropology and applied human science, Vol. 24, No. 4, 01.07.2005, p. 419-423.

Research output: Contribution to journalArticle

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