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BMC Geriatr. 2017 Dec 6;17(1):280. doi: 10.1186/s12877-017-0675-1.

Associations of sedentary behavior and physical activity with older adults' physical function: an isotemporal substitution approach.

Author information

1
Faculty of Liberal Arts and Sciences, Bunka Gakuen University, 3-22-1 Yoyogi, Shibuya-ku, Tokyo, 151-8523, Japan. yasunaga@bunka.ac.jp.
2
Faculty Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan.
3
Faculty of Sport Sciences, Waseda University, Tokorozawa, Japan.
4
Behavioural Epidemiology Laboratory, Baker Heart and Diabetes Institute, Melbourne, Australia.
5
Institute for Health & Aging, Australian Catholic University, Melbourne, Australia.
6
Department of Preventive Medicine and Public Health, Tokyo Medical University, Tokyo, Japan.
7
Swinburne University of Technology, Melbourne, Australia.

Abstract

BACKGROUNDS:

The purpose of this study was to examine, in a sample of Japanese older adults, the associations of objectively-assessed sedentary behavior (SB) and physical activity (PA) with performance-based physical function. The isotemporal substitution (IS) approach was used to model simultaneously the effects of the specific activity being performed and the activity being displaced, in an equal time-exchange manner.

METHODS:

Among 287 older adults (65-84 years), we used accelerometers to identify the daily average time spent on SB (≤1.5 METs); light-intensity PA (LIPA) (>1.5 to <3.0 METs); and moderate- to vigorous-intensity PA (MVPA) (≥3.0 METs). Physical function was assessed using five performance-based measures: hand grip strength, usual and maximum gait speeds, timed up and go, and one-legged stance with eyes open. We employed three linear regression models - a single-activity model, a partition model, and an IS model - to assess the associations of SB, LIPA, and MVPA with each of the five measures of physical function.

RESULTS:

There were significant positive associations in the single-activity and partition models between MVPA and the measures of physical function (with the exception of hand grip strength). The IS models found that replacing SB or LIPA with MVPA was significantly and favorably associated with physical function measures.

CONCLUSIONS:

These findings indicate that replacing small amounts of SB and LIPA with MVPA (such as 10 min) may contribute to improvements in older adults' physical function.

KEYWORDS:

Accelerometer; Active behaviors; Functional test; Mobility; Sitting

PMID:
29212458
PMCID:
PMC5719750
DOI:
10.1186/s12877-017-0675-1
[Indexed for MEDLINE]
Free PMC Article

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