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

Akitomo Yasunaga, Ai Shibata, Kaori Ishii, MohammadJavad Koohsari, Shigeru Inoue, Takemi Sugiyama, Neville Owen, Koichiro Oka

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


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.

Original languageEnglish
Article number280
Pages (from-to)280
Number of pages1
JournalBMC geriatrics
Issue number1
Publication statusPublished - 2017 Dec 6


  • Accelerometer
  • Active behaviors
  • Functional test
  • Mobility
  • Sitting

ASJC Scopus subject areas

  • Geriatrics and Gerontology


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