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Related Experiment Videos

Stabilographic analysis of unconstrained standing.

M Duarte1, W Harvey, ZatsiorskyVM

  • 1Escola de Educacao Fisica e Esporte, Universidade de Sao Paulo, Brazil. mduarte@usp.br

Ergonomics
|December 6, 2000
PubMed
Summary

Investigating natural standing, this study found no significant changes in postural adjustments across various conditions. Factors like mechanical load, vision, surface, and footwear did not alter the frequency of center of pressure patterns during quiet standing.

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Area of Science:

  • Biomechanics
  • Human postural control
  • Kinetics

Background:

  • Natural standing involves continuous postural adjustments.
  • Several hypotheses attempt to explain these postural changes.
  • Quantifying center of pressure (COP) patterns is key to understanding standing stability.

Purpose of the Study:

  • To investigate four hypotheses explaining postural changes during natural standing.
  • To quantify the number of postural changes using COP data under varied experimental conditions.
  • To assess the impact of mechanical loading, visual input, support surface, and footwear on standing stability.

Main Methods:

  • Subjects performed 30-minute unconstrained standing trials on a force plate.
  • Experimental conditions manipulated mechanical load, visual conditions, support surface, and shoe sole.

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  • Postural changes were quantified by analyzing center of pressure (COP) patterns and stabilogram parameters.

    • Main Results:

    • No significant effects were observed on the number of COP patterns due to load, vision, surface, or shoe conditions.
    • Approximately two COP patterns per minute were consistently recorded across all tested conditions.
    • Standard statistical parameters of COP displacement (standard deviation, velocity, mean frequency, area) showed no significant differences between conditions.

    Conclusions:

    • Mechanical loading, visual conditions, support surface, and footwear do not significantly alter postural control strategies during unconstrained standing.
    • Human standing stability, as measured by COP patterns, appears robust to common environmental and task variations.
    • The findings suggest a consistent, low rate of postural adjustments during quiet standing regardless of tested modulations.