title: Self-efficacy and the progression of functional limitations and self-reported disability in older adults with knee pain.
abstract: OBJECTIVE
  The prospective relationships between self-efficacy beliefs, in conjunction with measures of knee pain and knee strength, and subsequent decline in both physical performance and self-reported disability among older adults with knee pain were examined.
  
  
  METHODS
  In this prospective epidemiological trial, 480 men and women aged 65 years and older who had knee pain on most days of the week and difficulty with daily activity were followed for 30 months.
  
  
  RESULTS
  There was a significant interaction of baseline self-efficacy with baseline knee strength in predicting both self-reported disability and stair climb performance. Participants who had low self-efficacy and low strength at baseline had the largest 30-month decline in these outcomes.
  
  
  CONCLUSIONS
  These data underscore the important role that self-efficacy beliefs play in understanding functional decline with chronic disease and aging. Self-efficacy beliefs appear to be most important to functional decline in older adults when they are challenged by muscular weakness in the lower extremities.
authors.affiliation: Department of Health and Exercise Science, Wake Forest University, Winston-Salem, North Carolina 27109, USA. rejeski@wfu.edu
authors.forename: W J
authors.initials: WJ
authors.lastname: Rejeski
authors.forename: M E
authors.initials: ME
authors.lastname: Miller
authors.forename: C
authors.initials: C
authors.lastname: Foy
authors.forename: S
authors.initials: S
authors.lastname: Messier
authors.forename: S
authors.initials: S
authors.lastname: Rapp
mesh_terms: D000203:Activities of Daily Living / Q000523:psychology*; D000368:Aged; D000369:Aged, 80 and over; D018771:Arthralgia / Q000523:psychology*; D004185:Disability Evaluation; D005260:Female; D015577:Geriatric Assessment; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D020370:Osteoarthritis, Knee / Q000523:psychology*; D012803:Sick Role