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Related Experiment Videos

Force platform measures for evaluating postural control: reliability and validity.

P A Goldie1, T M Bach, O M Evans

  • 1Department of Physiotherapy, Lincoln School of Health Sciences, LaTrobe University, Victoria, Australia.

Archives of Physical Medicine and Rehabilitation
|July 1, 1989
PubMed
Summary
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Force platform measures are more reliable and valid for assessing stance stability than center of pressure (CP) measures. Force measures better discriminate changes in steadiness across different stances.

Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Kinesiology

Background:

  • Assessing postural sway and balance is crucial in clinical settings.
  • Force platforms and center of pressure (CP) measures are commonly used to evaluate stance steadiness.
  • Understanding the reliability and validity of these measures is essential for accurate clinical interpretation.

Purpose of the Study:

  • To investigate the reliability and validity of force platform measures compared to CP measures for evaluating stance steadiness.
  • To determine which measures are more sensitive to changes in base of support.
  • To provide a rationale for selecting appropriate measures in clinical practice.

Main Methods:

  • 28 healthy subjects performed four stance positions: two-legged, step, tandem, and one-legged.

Related Experiment Videos

  • Five steadiness indices were derived from force and CP signals sampled for 15 seconds.
  • Standard deviation was computed for each signal, and correlations between measures were analyzed.

    • Main Results:

    • Correlations between force and CP measures were generally weak, with ~40% being nonsignificant.
    • Force measures demonstrated higher retest reliability than CP measures, a statistically significant difference in three stances.
    • Force measures were more sensitive than CP measures in discriminating changes in steadiness due to altered base of support.

    Conclusions:

    • Force measures offer superior reliability and validity for assessing stance steadiness compared to CP measures.
    • Force measures are recommended over CP measures due to their fundamental advantages in reliability and validity.
    • These findings support the use of force platform measures for a more robust evaluation of postural control.