Accelerometer-Monitored Sedentary Behavior and Observed Physical Function Loss

作者：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^*

来源：American Journal of Public Health, 2015, 105(3): 560-566.

DOI：10.2105/AJPH.2014.302270

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.

• 出版日期2015-3
• 单位西北大学