Citation

Semanik PA, Lee J, Song J, Chang RW, Sohn MW, Ehrlich-Jones LS, Ainsworth BE, Nevitt MM, Kwoh CK, Dunlop DD. Am. J. Public Health 2015; 105(3): 560-566.

Affiliation

Pamela A. Semanik is with the College of Nursing, Rush University, Chicago, IL. Barbara E. Ainsworth is with the School of Nutrition and Health Promotion, College of Health Solutions, Phoenix, Arizona. Jungwha Lee, Jing Song, Rowland W. Chang, and Dorothy D. Dunlop are with the Feinberg School of Medicine, Northwestern University, Chicago. Min-Woong Sohn is with the School of Medicine, University of Virginia, Charlottesville. Linda S. Ehrlich-Jones is with the Center for Rehabilitation Outcome Research, Rehabilitation Institute of Chicago. Michael M. Nevitt is with the Coordinating Center, University of California, San Francisco. C. Kent Kwoh is with University of Arizona Medical Center, Tucson.

Copyright

(Copyright © 2015, American Public Health Association)

DOI

10.2105/AJPH.2014.302270

PMID

25602883

Abstract

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. (Am J Public Health. Published online ahead of print January 20, 2015: e1-e7. doi:10.2105/AJPH.2014.302270).

Language: en