title: Association of Objectively Measured Physical Activity and Metabolic Syndrome Among US Adults With Osteoarthritis.
abstract: OBJECTIVE
  To investigate the association between objectively measured physical activity and metabolic syndrome among adults with osteoarthritis (OA).
  
  
  METHODS
  Using cross-sectional data from the 2003-2006 National Health and Nutrition Examination Survey, we identified 566 adults with OA with available accelerometer data assessed using Actigraph AM-7164 and measurements necessary to determine metabolic syndrome by the Adult Treatment Panel III. Analysis of variance was conducted to examine the association between continuous variables in each activity level and metabolic syndrome components. Logistic models estimated the relationship of quartile of daily minutes of different physical activity levels to odds of metabolic syndrome adjusted for socioeconomic and health factors.
  
  
  RESULTS
  Among persons with OA, most were women average age of 62.1 years and average disease duration of 12.9 years. Half of adults with OA had metabolic syndrome (51.0%; 95% confidence interval [95% CI] 44.2%-57.8%), and only 9.6% engaged in the recommended 150 minutes per week of moderate/vigorous physical activity. Total sedentary time was associated with higher rates of metabolic syndrome and its components, while light and objectively measured moderate/vigorous physical activity was inversely associated with metabolic syndrome and its components. Higher levels of light activity were associated with lower prevalence of metabolic syndrome (quartile 4 versus quartile 1: adjusted odds ratio 0.45, 95% CI 0.24-0.84, P for linear trend < 0.005).
  
  
  CONCLUSIONS
  Most US adults with OA are sedentary. Increased daily minutes in physical activity, especially in light intensity, is more likely to be associated with decreasing prevalence of metabolic syndrome among persons with OA.
authors.affiliation: University of Massachusetts Medical School, Worcester.
authors.forename: Shao-Hsien
authors.initials: SH
authors.lastname: Liu
authors.affiliation: University of Massachusetts Medical School, Worcester.
authors.forename: Molly E
authors.initials: ME
authors.lastname: Waring
authors.affiliation: Memorial Hospital of Rhode Island, Pawtucket, and Warren Alpert Medical School, School of Public Health, Brown University, Providence, Rhode Island.
authors.forename: Charles B
authors.initials: CB
authors.lastname: Eaton
authors.affiliation: University of Massachusetts Medical School, Worcester.
authors.forename: Kate L
authors.initials: KL
authors.lastname: Lapane
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D015897:Comorbidity; D016001:Confidence Intervals; D003430:Cross-Sectional Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D024821:Metabolic Syndrome / Q000175:diagnosis / Q000453:epidemiology*; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D016017:Odds Ratio; D010003:Osteoarthritis / Q000175:diagnosis / Q000453:epidemiology*; D012016:Reference Values; D012189:Retrospective Studies; D018570:Risk Assessment; D057185:Sedentary Behavior; D012737:Sex Factors; D014481:United States