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Predicting the dynamic postural control response from quiet-stance behavior in elderly adults.

Elizabeth T Hsiao-Wecksler1, Kunal Katdare, Jennifer Matson

  • 1Department of Biomedical Engineering, Center of BioDynamics, Boston University, Boston, MA, USA. ethw@uiuc.edu

Journal of Biomechanics
|August 2, 2003
PubMed
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Predicting human balance control responses to perturbations is possible using quiet stance data. This finding holds true regardless of age, suggesting consistent postural control mechanisms.

Area of Science:

  • Biomechanics
  • Human postural control
  • Stochastic processes

Background:

  • Human postural sway, measured by center of pressure (COP) fluctuations, is a stochastic process.
  • The fluctuation-dissipation theorem (FDT) links system fluctuations to relaxation after perturbation.

Purpose of the Study:

  • To apply an FDT-based linear relationship to the human postural control system.
  • To determine if anterior-posterior (AP) COP sway during quiet stance predicts AP response to mechanical perturbations.

Main Methods:

  • Tested 10 young and 10 elderly adults.
  • Applied an FDT-based linear model to quiet stance and perturbation response data.
  • Measured AP COP fluctuations and AP response to a posterior waist tug.

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Main Results:

  • The FDT-based linear relationship applied to 10 young and 8 of 10 elderly adults.
  • Quiet stance COP data successfully predicted postural response to perturbations in most participants.
  • Age did not prevent the applicability of this predictive relationship.

Conclusions:

  • An individual's dynamic response to mild perturbation can be predicted from quiet stance data.
  • The human postural control system may employ similar mechanisms during quiet stance and mild perturbation.
  • This FDT-based relationship is robust across different age groups.