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Reduced gait stability in high-functioning poststroke individuals.

Tal Krasovsky1, Anouk Lamontagne, Anatol G Feldman

  • 1School of Physical and Occupational Therapy, McGill University, Montreal, Quebec, Canada. tal.krasovsky@mail.mcgill.ca

Journal of Neurophysiology
|October 12, 2012
PubMed
Summary
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Individuals post-stroke show impaired gait stability and recovery after perturbations compared to controls. Faster walking did not improve stability, highlighting deficits in neurological control processes affecting fall risk.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Rehabilitation Science

Background:

  • Falls are a significant cause of injury in post-stroke individuals.
  • Gait stability and recovery following perturbations are crucial for preventing falls.
  • Increased walking speed may impact the ability to recover from gait disturbances.

Purpose of the Study:

  • To compare gait stability between high-functioning post-stroke individuals and controls.
  • To evaluate the effect of gait speed on gait stability after a perturbation.
  • To identify neurological deficits affecting gait recovery and fall risk.

Main Methods:

  • Ten post-stroke individuals and ten age-matched controls walked on a treadmill at matched and faster speeds.
  • A perturbation was introduced by arresting the nonparetic/dominant leg during the early swing phase.

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  • Gait stability, leg movement responses, and interlimb coordination were analyzed.

    • Main Results:

    • Post-stroke individuals were more likely to lower the perturbed leg (58%) compared to controls (49%).
    • Recovery of double-support duration was delayed in the stroke group.
    • Faster walking did not enhance stability and led to less coordinated responses in the stroke group, limited to the nonparetic side.

    Conclusions:

    • Gait perturbations reveal fundamental neurological deficits in individuals post-stroke, impacting fall risk.
    • Impaired descending control in stroke affects the motor system's ability to recover from perturbations and regulate gait.
    • While interlimb coordination is affected, it may not be the primary factor in gait stability recovery after perturbations.