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Related Experiment Videos

Does postural instability affect the initiation of human gait?

Paul Fiolkowski1, Denis Brunt, Mark Bishop

  • 1Department of Physical Therapy, University of Florida, P.O. Box 100154 HSC, Gainesville, FL 32610-0154, USA.

Neuroscience Letters
|April 18, 2002
PubMed
Summary

Gait initiation (GI) appears to be a pre-programmed task. Even with reduced postural stability after a tibial nerve block, the kinetic and temporal aspects of initiating gait remained unchanged.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Motor Control

Background:

  • Gait initiation (GI) involves the complex interplay of postural control and voluntary movement.
  • The decoupling of the center of mass (COM) and center of pressure (COP) is crucial for initiating forward motion.
  • The role of sensory feedback, specifically from the tibial nerve, in modulating GI is not fully understood.

Purpose of the Study:

  • To investigate the effect of diminished proprioceptive feedback from the tibial nerve on postural stability during gait initiation.
  • To determine if reduced single-leg postural stability impacts the kinetic and temporal characteristics of gait initiation.
  • To explore whether gait initiation is a pre-programmed motor task, independent of real-time sensory feedback.

Main Methods:

Related Experiment Videos

  • Experimental study involving human subjects performing gait initiation before and after a tibial nerve block.
  • Measurements included static single-limb stability, stance limb ground reaction forces, electromyography (EMG), and temporal gait parameters.
  • Comparison of biomechanical and kinematic data to assess changes in gait initiation under conditions of reduced sensory input.

    • Main Results:

    • Subjects exhibited significantly decreased postural stability following the tibial nerve block.
    • Changes in normal gait kinetics were observed post-nerve block.
    • Despite reduced postural stability, no significant alterations were found in ground reaction forces or the relative temporal aspects of the gait initiation task.

    Conclusions:

    • Diminished single-leg postural stability, induced by tibial nerve block, does not affect the kinetic or temporal execution of gait initiation.
    • These findings support the hypothesis that gait initiation is a largely pre-programmed motor task.
    • The motor system may rely on internal predictive mechanisms rather than continuous sensory feedback for initiating gait.