title: Comparison of clinical and biomechanical measures of balance and mobility in elderly nursing home residents.
abstract: OBJECTIVE
  To compare biomechanics force platform measurements of postural sway with clinical measures of balance and mobility, in frail elderly residents of community nursing homes, in terms of feasibility, correlation with other known risk factors for falls, and intercorrelation with each other.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Twelve Tennessee community nursing homes.
  
  
  METHODS
  Of 1315 residents 360 (> or = 65) could stand independently (> or = 10 seconds). Of these eligible subjects, 303 (84%) provided informed consent and were assessed.
  
  
  METHODS
  The biomechanics force platform measurements were postural sway during quiet standing characterized as elliptical area and mean velocity. The clinical measures were functional reach, mobility maneuvers (adapted from Tinetti's Mobility Index), timed chair stands, and 10-foot walk. Resident characteristics and function were also obtained.
  
  
  RESULTS
  Balance measurements were obtained on most (100% for postural sway to 67% for chair stand) consenting residents and were reliable on test-retest (intraclass correlation from .56 to .98). Performance in both groups of balance measures deteriorated with increasing musculoskeletal disability. Functional reach and mobility maneuvers correlated with height, and mobility maneuvers with depressive symptoms. Elliptical area correlated with mean velocity of postural sway (Pearson's r = 0.72; P < 0.001), and the clinical measures of balance (functional reach, mobility maneuvers, timed chair stands and walk) were modestly intercorrelated (r from 0.35 to 0.65; all P values < or = 0.05). However, the biomechanical measures were not correlated with the clinical measures.
  
  
  CONCLUSIONS
  Standard measures of balance were obtained reliably from nursing home residents who could stand independently for > or = 10 seconds. However, in this group, further research is needed to determine which measures best predict falls. Further research is also needed to identify predictors of falls in the majority of residents who were too frail to undergo these standard assessments.
authors.affiliation: Department of Preventive Medicine MCN A-1124, Vanderbilt University School of Medicine, Nashville, TN 37232.
authors.forename: P B
authors.initials: PB
authors.lastname: Thapa
authors.forename: P
authors.initials: P
authors.lastname: Gideon
authors.forename: R L
authors.initials: RL
authors.lastname: Fought
authors.forename: M
authors.initials: M
authors.lastname: Kormicki
authors.forename: W A
authors.initials: WA
authors.lastname: Ray
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D003072:Cognition Disorders; D003430:Cross-Sectional Studies; D003863:Depression; D005260:Female; D016330:Frail Elderly; D015577:Geriatric Assessment; D006801:Humans; D008297:Male; D009735:Nursing Homes; D004856:Postural Balance; D011187:Posture; D011597:Psychomotor Performance; D016138:Walking