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Related Experiment Videos

Age-related changes in open-loop and closed-loop postural control mechanisms

J J Collins1, C J De Luca, A Burrows

  • 1NeuroMuscular Research Center, Boston University, MA 02215, USA.

Experimental Brain Research
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Aging affects balance control by altering open-loop and closed-loop systems. Elderly individuals show more unstable open-loop control and delayed closed-loop responses, impacting postural stability.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Gerontology

Background:

  • Upright stance regulation involves open-loop and closed-loop control mechanisms.
  • The impact of aging on these control systems requires further investigation.
  • Stabilogram-diffusion analysis offers a method to assess postural control dynamics.

Purpose of the Study:

  • To investigate how natural aging affects the operational characteristics of open-loop and closed-loop postural control mechanisms.
  • To compare postural control dynamics between healthy young and elderly males using stabilogram-diffusion analysis.
  • To determine if traditional posturographic analyses are sensitive to age-related changes in postural control.

Main Methods:

  • Utilized stabilogram-diffusion analysis to examine center-of-pressure (COP) trajectories during quiet standing.

Related Experiment Videos

  • Recruited 25 healthy young males (19-30 years) and 25 elderly males (71-80 years).
  • Measured COP displacements using an instrumented force platform.

    • Main Results:

    • Healthy aging is associated with significant changes in the quasi-static dynamics of postural control.
    • Elderly individuals exhibited more positively correlated (potentially unstable) open-loop control and more negatively correlated (potentially stable) closed-loop control.
    • Elderly subjects utilized open-loop control for longer durations and showed greater COP displacements, indicating delayed closed-loop feedback activation.
    • Increased heterogeneity in postural control abilities was observed in healthy older adults.

    Conclusions:

    • Stabilogram-diffusion analysis is more sensitive to age-related postural control changes than traditional summary statistics.
    • Aging alters the balance between open-loop and closed-loop postural control strategies.
    • Elderly individuals may rely more on open-loop mechanisms, with a delayed engagement of closed-loop feedback, potentially contributing to reduced postural stability.