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Jing Liao, Sanmei Chen, Sha Chen and Yung-Jen Yang

This study aimed to examine personal and social environmental correlates of the physical activity habit of middle-aged and older adults, using Chinese square dancing as a natural exploratory example. Participants were 385 adults aged ≥45 years (93% female), who habitually danced on squares or parks of three old districts of Guangzhou. Multinomial logistic regression was used to identify personal, social, psychological, and behavioral correlates of multiyear dance. Old age, high education, sufficient leisure time, and stable social environmental factors were associated with persistent dancing, whereby education (relative risk ratio [RRR] = 1.64, 95% confidence interval [1.05, 2.57]) and social engagement (RRR = 1.66, 95% confidence interval [1.05, 2.63]) showed the largest effects. Participants dancing ≤1 year were least satisfied with their social relationships than their counterparts dancing 1–5 years (RRR = 0.68) or over 5 years (RRR = 0.58). Physical activity promotion for older adults should adapt from culturally appropriate group activities and leverage community social resources to encourage voluntary participation, particularly for low-educated older women.

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Tao Chen, Kenji Narazaki, Yuka Haeuchi, Sanmei Chen, Takanori Honda and Shuzo Kumagai


This cross-sectional study was performed to examine associations of objectively measured sedentary time (ST) and breaks in sedentary time (BST) with instrumental activities of daily living (IADL) disability in Japanese community-dwelling older adults.


The sample comprised 1634 older adults (mean age: 73.3 y, men: 38.4%). Sedentary behavior was measured using a triaxial accelerometer. Disability was defined as inability in at least 1 of the IADL tasks using the Tokyo Metropolitan Institute of Gerontology Index of Competence.


After adjusting for potential confounders and moderate-to-vigorous physical activity (MVPA), longer ST was significantly associated with higher likelihood of IADL disability, whereas a greater number of BST was associated with lower likelihood of IADL disability. ST and BST remained statistically significant after mutual adjustment with odds ratio of 1.30 (95% confidence interval [CI)], 1.00–1.70) and 0.80 (95% CI, 0.65–0.99), respectively.


This study first demonstrated that shorter ST and more BST were associated with lower risk of IADL disability independent of MVPA and that the association for ST was independent of BST and vice versa. These findings suggest not only total ST but also the manner in which it is accumulated may contribute to the maintenance of functional independence in older adults.