Accelerometer-monitored sedentary behavior and observed physical function loss

• Published in: American journal of public health (1971) Vol. 105; no. 3; pp. 560 - 566
• Main Authors: Semanik, Pamela A, Lee, Jungwha, Song, Jing, Chang, Rowland W, Sohn, Min-Woong, Ehrlich-Jones, Linda S, Ainsworth, Barbara E, Nevitt, Michael M, Kwoh, C Kent, Dunlop, Dorothy D
• Format: Journal Article
• Language: English
• Published: United States American Public Health Association 01.03.2015
• Subjects: Accelerometers; Accelerometry - instrumentation; Accelerometry - methods; Aged; Aged, 80 and over; Arthritis; Baby boomers; Behavior; Body Mass Index; Cohort analysis; Epidemiology; Ethnicity; Exercise; Exercise/Physical Activity; Female; Gait; Gait - physiology; Humans; Knee; Longitudinal Studies; Male; Middle Aged; Monitoring, Physiologic - instrumentation; Monitoring, Physiologic - methods; Motor Activity; Obesity; Obesity/Overweight/Underweight; Older people; Osteoarthritis; Osteoarthritis, Knee - etiology; Osteoarthritis, Knee - prevention & control; Other Chronic Disease; Overweight; Pain; Physical fitness; Physiology; Prevention; Protective Factors; Public health; Research and Practice; Risk Factors; Sedentary behavior; Sedentary Lifestyle; Socioeconomic factors; Time Factors; United States; United States; United States > US
• ISSN: 0090-0036; 1541-0048
• DOI: 10.2105/ajph.2014.302270

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. 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). 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. 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.