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Related Experiment Videos

Adaptations of walking pattern on a compliant surface to regulate dynamic stability.

Michael J MacLellan1, Aftab E Patla

  • 1Gait and Posture Laboratory, Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada.

Experimental Brain Research
|February 24, 2006
PubMed
Summary

The central nervous system (CNS) adjusts walking patterns on compliant surfaces by lowering the center of mass (COM) and altering step parameters to maintain dynamic stability.

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Motor control

Background:

  • Dynamic stability is crucial for daily activities.
  • The central nervous system (CNS) must adapt to changing travel surfaces.
  • Understanding adaptations to compliant surfaces is key for mobility.

Purpose of the Study:

  • To investigate stability control mechanisms during locomotion on compliant surfaces.
  • To characterize adaptations in gait parameters, center of mass (COM) trajectory, and muscle activity.
  • To examine how the CNS manages proactive and reactive adjustments for stability.

Main Methods:

  • Eight young adults walked on baseline ground and a compliant foam mat.
  • 3D full-body kinematics were recorded using an Optotrak system.

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  • Bilateral lower limb electromyography (EMG) was collected for key muscles.

    • Main Results:

    • Vertical COM decreased, while medio-lateral COM remained unaffected on the compliant surface.
    • Increased step width and length, along with elevated toe trajectory, were observed.
    • Gastrocnemius and soleus muscle activity increased during push-off, correlating with step length.
    • Anterior-posterior dynamic stability margin showed overcompensation and correction patterns.

    Conclusions:

    • The CNS actively modifies motor patterns to enhance stability on compliant surfaces.
    • Adjustments in COM, step parameters, and muscle activation are coordinated for stability.
    • These findings highlight the CNS's role in proactive and reactive gait control.