title: Objectively Measured Physical Activity and Symptoms Change in Knee Osteoarthritis.
abstract: The study objective was to quantify the association between daily physical activity measured by accelerometer and 1-year changes in symptoms among people with knee osteoarthritis.
  
  
  
  Participants from the Osteoarthritis Initiative had knee radiographs and physical activity assessed using GT1M ActiGraph (Pensacola, FL) uniaxial accelerometers at the 48-month visit. Physical activity was calculated and categorized as tertiles of average daily minutes in light and moderate-to-vigorous activity. Outcomes were 1-year change in symptoms measured by Western Ontario and McMaster Universities scales, including pain, stiffness, and physical function. Adjusted multivariable linear models estimated the relationship between tertiles of light or moderate-to-vigorous physical activity and changes in knee symptoms.
  
  
  
  Among 1059 participants (55% were women; mean age, 66 ± 9 years), greater time in light activity was associated with a trend toward declined physical function (P = .01). Greater time in daily moderate-to-vigorous activity also was associated with declined physical function (P = .01) and increased pain (P = .08). None of these average changes in symptoms reached minimally important clinical differences. However, greater daily time in both activities was associated with a higher probability of worsening symptoms among persons with Kellgren-Lawrence grade 4 osteoarthritis.
  
  
  
  Objectively measured daily activity was not associated with 1-year symptom improvements among community-dwelling adults with knee osteoarthritis. In those with advanced disease (Kellgren-Lawrence grade 4), greater daily minutes in physical activity were associated with worsening symptoms. How best to implement exercise regimens in persons with advanced knee osteoarthritis to reduce the deleterious impact on symptoms needs to be explored.
authors: Clinical and Population Health Research Program, Graduate School of Biomedical Sciences, University of Massachusetts Medical School, Worcester, Mass. Electronic address: shaohsien.liu@umassmed.edu.
authors: Shao-Hsien
authors: SH
authors: Liu
authors: Division of Rheumatology, Tufts Medical Center, Boston, Mass.
authors: Jeffrey B
authors: JB
authors: Driban
authors: Center for Primary Care and Prevention, Memorial Hospital of Rhode Island, Pawtucket; Departments of Family Medicine and Epidemiology, Warren Alpert Medical School, School of Public Health, Brown University, Providence, RI.
authors: Charles B
authors: CB
authors: Eaton
authors: Division of Rheumatology, Tufts Medical Center, Boston, Mass.
authors: Timothy E
authors: TE
authors: McAlindon
authors: Departments of Medicine and Orthopedics, University of Massachusetts Medical School, Worcester, Mass.
authors: Leslie R
authors: LR
authors: Harrold
authors: Division of Epidemiology of Chronic Diseases and Vulnerable Populations, Department of Quantitative Health Sciences, University of Massachusetts Medical School, Worcester, Mass.
authors: Kate L
authors: KL
authors: Lapane
mesh_terms: D061725:Accelerometry; D000203:Activities of Daily Living; D000368:Aged; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology*; D011446:Prospective Studies; D012720:Severity of Illness Index
keywords: Knee osteoarthritis; Patient-reported outcomes; Physical activity