title: Age-related differences in time-limit performance and force platform-based balance measures during one-leg stance.
abstract: Poor posture control has been associated with an increased risk of falls and mobility disability among older adults. This study was conducted to assess the test-retest reliability and sensitivity to group differences regarding the time-limit (TLimit) of one-leg standing and selected balance parameters obtained with a force platform in older and young adults. A secondary purpose was to assess the relationship between TLimit and these balance parameters. Twenty-eight healthy older adults (age: 69±5years) and thirty young adults (age: 21±4years) participated in this study. Two one-leg stance tasks were performed: (1) three trials of 30s maximum and (2) one TLimit trial. The following balance parameters were computed: center of pressure area, RMS sway amplitude, and mean velocity and mean frequency in both the anterio-posterior and medio-lateral directions. All balance parameters obtained with the force platform as well as the TLimit variable were sensitive to differences in balance performance between older and young adults. The test-retest reliability of these measures was found to be acceptable (ICC: 0.40-0.85), with better ICC scores observed for mean velocity and mean frequency in the older group. Pearson correlations coefficients (r) between balance parameters and TLimit ranged from -0.16 to -0.54. These results add to the current literature that can be used in the development of measurement tools for evaluating balance in older and young adults.
authors: Center for Health Science Research, Laboratory of Functional Evaluation and Human Motor Performance, Universidade Norte do Paraná (UNOPAR), 675 Paris Ave., CEP 86041-120, Londrina-PR, Brazil. rubens@unopar.br
authors: Rubens A
authors: RA
authors: da Silva
authors: Martin
authors: M
authors: Bilodeau
authors: Rodolfo B
authors: RB
authors: Parreira
authors: Denilson C
authors: DC
authors: Teixeira
authors: César F
authors: CF
authors: Amorim
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D008297:Male; D004856:Postural Balance / Q000502:physiology*; D015203:Reproducibility of Results; D013997:Time Factors; D055815:Young Adult