Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
©Journal of Sports Science and Medicine (2015) 14, 507 - 514

Research article
Tri-Axial Accelerometer-Determined Daily Physical Activity and Sedentary Behavior of Suburban Community-Dwelling Older Japanese Adults
Tao Chen1, Kenji Narazaki2, Takanori Honda1, Sanmei Chen1, Yuki Haeuchi1, Yu Y Nofuji3, Eri Matsuo3, Shuzo Kumagai1,4, 
Author Information
1 Department of Behavior and Health Sciences, Graduate School of Human-Environment Studies, Kyushu University, Fukuoka, Japan
2 Central Research Institute for Physical Activity, Fukuoka University, Fukuoka, Japan
3 Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
4 Faculty of Arts and Science, Kyushu University, Fukuoka, Japan

Shuzo Kumagai
✉ Faculty of Arts and Sciences, Kyushu University, 6-1, Kasuga kouen, Kasuga City, Fukuoka, 816-8580, Japan
Publish Date
Received: 07-01-2015
Accepted: 17-04-2015
Published (online): 11-08-2015
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Knowledge regarding accelerometer-derived physical activity (PA) and sedentary behavior (SED) levels is scarce for Japanese older adults. The aims of this study were therefore to 1) describe levels of PA and SED in Japanese community-dwelling older adults, using tri-axial accelerometer; 2) examine the variation of PA and SED with respect to sex, age, and body mass index (BMI). Participants of this study were from the baseline survey of the Sasaguri Genkimon Study, who were 65 years or older and not certified as those requiring long-term care. PA was assessed objectively for seven consecutive days using tri-axial accelerometer. A total of 1,739 participants (median age: 72 years, men: 38.0%) with valid PA data were included. Overall, participants in the present study spent 54.5% of their waking time being sedentary and 45.5% being active, of which 5.4% was moderate-to-vigorous physical activity (MVPA). Women accumulated more minutes of light physical activity (LPA) and MVPA compared with men. In contrast, men spent more time being sedentary. Mean steps per day did not differ between sexes. Furthermore, participants with higher BMI (BMI ≥25) had lower PA levels, and longer SED compared with those with lower BMI (BMI <). PA levels were lower and SED was longer with age. The present study is the first to demonstrate that the levels of PA and SED differed by sex, age, and BMI in Japanese community-dwelling older adults. In particular, women were more active compared with men, providing unique insight into the current level of PA in older adults. Data presented in the study will enable further investigation of additional determinants of PA and SED in order to develop effective population-based intervention strategies to promote PA and reduce prolonged SED in the Japanese population and possibly other rapidly aging societies.

Key words: Tri-axial accelerometer, physical activity, sedentary behavior, community-based study, older adults

           Key Points
  • Accelerometer, that is capable to assess PA more precisely in large scale epidemiological studies, provides opportunity for improving understanding of daily PA in older adults.
  • This study first demonstrated that the levels of PA and SED differed by sex, age, and BMI in Japanese community-dwelling older people.
  • Women were more active compared with men, in terms of more minutes of MVPA.
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