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The relationship between mental disorders and biological rhythms. Nariyoshi YAMAGUCHI 1 1Department of Neuropsychiatry, Kanazawa University School of Medicine pp.1020-1028
Published Date 1992/12/10
DOI https://doi.org/10.11477/mf.1431900300
  • Abstract
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 There are some kinds of biological rhythms. The circannual rhythms are rhythms with a period of about a year. Seasonal rhythms and reproductive rhythms in some animals follow a circannual cycle. The circatrigintan rhythms are rhythms, such as the human menstrual cycle, that approximate a month in duration. The circadian rhythm is a rhythm of approximately 24 hours in length. The ultradian rhythm is a rhythm with a period of less than 20 hours.

 I introduced a multicenter study of seasonal affective disorders (SAD) in Japan reported by Dr. K. Takahashi and associates as a disorder of circannual rhythms. Essentially similar findings to other previous report of SAD were obtained in Japanese cases. However, a nearly equal sex ratio, together with a lack of a strong latitude dependece of this disorder is characteristic of the Japanese SAD study.


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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