title: Age-related differences in quality of standing balance using a composite score.
abstract: BACKGROUND
  Age-related differences in standing balance are not detected by testing the ability to maintain balance. Quality of standing balance might be more sensitive to detect age-related differences.
  
  
  OBJECTIVE
  To study age-related differences in quality of standing balance, center of pressure (CoP) movement was evaluated using a wide range of CoP parameters in several standing conditions in healthy young and old participants.
  
  
  METHODS
  In 35 healthy young (18-30 years) and 75 healthy old (70-80 years) participants, CoP movement was assessed in eight standing conditions on a force plate, including side-by-side, one-leg, semi-tandem and tandem stance, both with eyes open and eyes closed. Direction-specific CoP composite scores were calculated from standardized single CoP parameters (mean amplitude, amplitude variability, mean velocity, velocity variability and range) in anterior-posterior (AP) and medial-lateral (ML) direction. Linear regression analysis was used to detect age-related differences in single CoP parameters and composite scores - adjusted for gender, height and weight.
  
  
  RESULTS
  Overall, single CoP parameters were higher in old compared to young participants, but no single CoP parameter consistently demonstrated the largest effect size for all standing conditions. Age-related differences were demonstrated for CoP composite scores in AP direction (tandem eyes open; semi-tandem eyes closed; p < 0.001). CoP composite scores in ML direction were consistently higher for all standing conditions in old compared to young participants (p < 0.001).
  
  
  CONCLUSIONS
  CoP composite scores in ML direction were the most consistent parameters to detect age-related differences in quality of standing balance in healthy participants and might be of clinical value to detect subtle changes in quality of standing balance.
authors: Department of Rehabilitation Medicine, Leiden University Medical Center, Leiden, The Netherlands.
authors: Jantsje H
authors: JH
authors: Pasma
authors: Astrid Y
authors: AY
authors: Bijlsma
authors: Mark D W
authors: MD
authors: van der Bij
authors: J Hans
authors: JH
authors: Arendzen
authors: Carel G M
authors: CG
authors: Meskers
authors: Andrea B
authors: AB
authors: Maier
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology; D011312:Pressure; D055815:Young Adult