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Postural control at the human wrist.

John Z Z Chew1, Simon C Gandevia, Richard C Fitzpatrick

  • 1Prince of Wales Medical Research Institute and University of New South Wales, Sydney, NSW 2031 Australia.

The Journal of Physiology
|January 12, 2008
PubMed
Summary
This summary is machine-generated.

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Load stiffness significantly impacts wrist posture stability, with negative stiffness increasing sway. Postural control relies on perception and voluntary tracking, not reflexes, and doesn't adapt to changing load properties.

Area of Science:

  • Biomechanics
  • Human motor control
  • Neuroscience

Background:

  • Maintaining posture involves counteracting physical loads with varying elastic stiffness (K).
  • Understanding how load stiffness influences postural stability is crucial for human movement analysis.

Purpose of the Study:

  • To investigate the effect of positive and negative load stiffness on wrist postural stability.
  • To determine if postural control adapts to altered load properties.

Main Methods:

  • Nine subjects held various loads with different stiffness properties (K = +/- 0.04, +/- 0.01, 0 N m deg(-1)) at varying mean torques.
  • Postural sway was measured, and subjects perceived their sway during 60-second trials.
  • Psychophysical thresholds were assessed to evaluate perception of load stiffness.

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Main Results:

  • Postural sway increased with higher mean torque and more negative stiffness.
  • Load stiffness significantly affected stability at low frequencies (< 1.5 Hz), but not at higher frequencies.
  • Subjects accurately perceived their sway but not the load stiffness itself.

Conclusions:

  • Load stiffness, independent of force, influences load control, with postural control relying on perception and volitional tracking, not automatic reflexes.
  • Postural control does not adapt to altered load properties, unlike feedforward movement control.
  • Postural and movement control appear to be distinct neural processes.