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Sitting time and physical function in Australian retirees: An analysis of bidirectional relationships
Gardiner, Paul A. Reid, Natasha Gebel, Klaus Ding, Ding
Gardiner, Paul A.
Reid, Natasha
Gebel, Klaus
Ding, Ding
Abstract
Background: There is limited evidence on the directionality of the associations of sitting time with physical function. This study examined the longitudinal associations of sitting time with changes in physical function, and physical function with changes in sitting time. Method: Data from 10,027 retirees in the Social, Economic, and Environmental Factor (SEEF) population-based cohort were collected in 2006–20008 and in 2010–2011. Daily sitting time was assessed by a single-item question. Physical function was measured with the Medical Outcomes Study Physical Functioning Scale (range 0–100) with participants categorized as: no; minor; moderate; or severe limitation. General linear regression models, adjusted for covariates, were used to assess associations of sitting time with physical function for all participants and in subgroups according to sex, and categories of body mass index, physical activity, and physical function limitations. Results: Each hour of baseline sitting was associated with declines in physical function for women (0.20 units [95% confidence interval {CI} 0.04–0.37]) and those with severe functional limitations (0.65 units [95% CI 0.20–1.12]). Each unit of baseline physical function was associated with declines in sitting time for all participants (0.009 hours/day [95% CI 0.005–0.013]) and for all subgroups. Conclusions: There was limited evidence of a bidirectional association of sitting time with physical function except in women and people with severe functional limitations. Health promotion efforts are needed to address the impact of poor physical function on increases in sitting time which result in further functional declines for these subgroups of the population.
Keywords
sedentary behavior, sitting time, physical function, population-based cohort, longitudinal studies
Date
2018
Type
Journal article
Journal
The Journals of Gerontology: Series A
Book
Volume
73
Issue
12
Page Range
1675-1681
Article Number
ACU Department
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Relation URI
Source URL
Event URL
Open Access Status
License
File Access
Controlled