Seasonal Variations of Melatonin Secretion in Young Females under Natural and Artificial Light Conditions in Fukuoka, Japan

DOI NDLデジタルコレクション 被引用文献1件 参考文献35件
  • Ueno-Towatari Tomoko
    Department of Living Environmental Science, Fukuoka Women's University
  • Norimatsu Kyoko
    Department of Living Environmental Science, Fukuoka Women's University
  • Blazejczyk Krzysztof
    Institute of Geography, Kazimierz Wielki University of Bydgoszcz Institute of Geography and Spatial Organization
  • Tokura Hiromi
    Institute of Textile & Clothing, The Hong Kong Polytechnic University
  • Morita Takeshi
    Department of Living Environmental Science, Fukuoka Women's University

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The purpose of this study was to examine the seasonal variations of melatonin secretion of subjects and of their surrounding light conditions. Eight Japanese female students (20.1±2.6 yrs, Mean±SD) living in Fukuoka, Japan, participated in the present study. Saliva samples were collected every 3 hours over the course of a day, and the light intensity during daily life was measured every 1 min for 5 days in the four seasons. Almost all subjects had different melatonin secretory profiles in autumn, with only two subjects showing similar rhythms in all four seasons. The peak values of melatonin secretion calculated by a spline interpolation were higher in autumn than those in other seasons (p<0.001, Fisher's PLSD) and its peak time in this season was significantly delayed compared with those in spring and summer (p<0.05, Fisher's PLSD). The amount of time during daytime exposure to light of >1,000 lux was at least thirty minutes in all the seasons, and there were no significant differences among them. The relationship between peak level of melatonin secretion and amount of time of daytime light exposure to >1,000 lux was significant only in the autumn. During this season, there was a significant positive correlation (r=0.83, p<0.05, n=6), except for two subjects, whose melatonin secretion remained low.

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