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Am J Geriatr Psychiatry 14:621-624, July 2006
© 2006 American Association for Geriatric Psychiatry
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Brief Report

Yearlong Physical Activity and Depressive Symptoms in Older Japanese Adults: Cross-Sectional Data from the Nakanojo Study

Kazuhiro Yoshiuchi, M.D., Ph.D., Rika Nakahara, M.D., Ph.D., Hiroaki Kumano, M.D., Ph.D., Tomifusa Kuboki, M.D., Ph.D., Fumiharu Togo, Ph.D., Eiji Watanabe, M.Sc., Akitomo Yasunaga, Ph.D., Hyuntae Park, M.Sc., Roy J. Shephard, M.D., Ph.D., D.P.E., and Yukitoshi Aoyagi, Ph.D.

From the Department of Psychosomatic Medicine, Faculty of Medicine, The University of Tokyo, Tokyo (KY, HK, TK); the Department of Psychiatry, Teikyo University Mizonokuchi Hospital, Kanagawa, Japan (RN); the Exercise Sciences Research Group, Division of Physiology and Aging, Tokyo Metropolitan Institute of Gerontology, Tokyo (FT, EW, AY, YA); the Graduate School of Education, The University of Tokyo, Tokyo (FT, HP); the Faculty of Human Sciences, University of Human Arts and Sciences, Saitama, Japan (EW); and the Faculty of Physical Education and Health, University of Toronto, Ontario, Canada (RJS).

Objective: The objective of this study was to investigate associations between accelerometer measurements of physical activity and psychosocial variables in older people.

Methods: Subjects were 184 Japanese aged 65–85 years. An accelerometer provided step count and physical activity intensity data throughout each 24-hour period for 1 year. At the end of the year, anxiety, depression, and cognitive function were assessed.

Results: Controlling for age, the daily number of steps, and the daily duration of moderate-intensity physical activity showed significant negative correlations with depressive mood.

Conclusion: A depressive mood is associated with the quantity and quality of habitual physical activity.

Key Words: Aging • accelerometer • step count • moderate-exercise duration • mental health • mood state






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