Accelerometer-monitored sedentary behavior and observed physical function loss

Pamela A. Semanik, Jungwha Lee, Jing Song, Rowland W. Chang, Min Woong Sohn, Linda S. Ehrlich-Jones, Barbara E. Ainsworth, Michael M. Nevitt, C. Kent Kwoh, Dorothy D. Dunlop

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


Objectives. We examined whether objectively measured sedentary behavior is related to subsequent functional loss among community-dwelling adults with or at high risk for knee osteoarthritis.

Methods. We analyzed longitudinal data (2008-2012) from 1659 Osteoarthritis Initiative participants aged 49 to 83 years in 4 cities. Baseline sedentary time was assessed by accelerometer monitoring. Functional loss (gait speed and chair stand testing) was regressed on baseline sedentary time and covariates (baseline function; socioeconomics [age, gender, race/ethnicity, income, education], health factors [obesity, depression, comorbidities, knee symptoms, knee osteoarthritis severity, prior knee injury, other lower extremity pain, smoking], and moderate-to-vigorous activity).

Results. This cohort spent almost two thirds of their waking hours (average = 9.8 h) in sedentary behaviors. Sedentary time was significantly positively associated with subsequent functional loss in both gait speed (-1.66 ft/min decrease per 10% increment sedentary percentage waking hours) and chair stand rate (-0.75 repetitions/min decrease), controlling for covariates.

Conclusions. Being less sedentary was related to less future decline in function, independent of time spent in moderate-to-vigorous activity. Both limiting sedentary activities and promoting physical activity in adults with knee osteoarthritis may be important in maintaining function.

Original languageEnglish
Pages (from-to)560-566
Number of pages7
JournalAmerican Journal of Public Health
Issue number3
StatePublished - Mar 1 2015

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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