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Intentional compensation for selective loading affecting human gait phases.

M Bonnard1, J Pailhous

  • 1Université d'Aix-Marseille II, Faculté de Medécine, Cognition & Mouvement, URA CNRS 1166, lBHOP, traverse Ch. Susini, 13388 Marseille, France.

Journal of Motor Behavior
|March 1, 1991
PubMed
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Humans quickly adjust walking to maintain constant speed despite external forces. Gait analysis reveals stride length and duration remain consistent, indicating synergistic control of locomotion phases.

Area of Science:

  • Biomechanics
  • Human Locomotion
  • Motor Control

Background:

  • Understanding how humans adapt walking is crucial for rehabilitation and assistive device design.
  • Locomotor synergy, the coordinated muscle activity during walking, is fundamental to stable gait.
  • Dynamic perturbations challenge the body's ability to maintain consistent walking speed.

Purpose of the Study:

  • To investigate the adaptive strategies employed during walking under altered dynamic conditions.
  • To determine how subjects modify their basic locomotor synergy to maintain constant walking speed.
  • To analyze the effects of external loads and forces on gait parameters.

Main Methods:

  • Twelve participants walked at a constant speed under modified dynamic conditions.

Related Experiment Videos

  • External loads and impeding forces were applied to selectively alter stance or swing phases.
  • Gait parameters including stride length, duration, and cadence were measured.

    • Main Results:

    • Subjects rapidly calibrated their motor output to maintain a constant walking speed.
    • Consistent walking speed was achieved through consistent stride length and duration across all conditions.
    • Changes in gait cycle duration synergistically affected both stance and swing phases.

    Conclusions:

    • Human walking exhibits robust adaptability to external perturbations.
    • Locomotor control relies on synergistic adjustments within the gait cycle.
    • Cadence serves as a feedback mechanism for maintaining walking speed, adjustable via exerted force.