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Related Experiment Videos

H-reflex modulation during walking in spastic paretic subjects.

J F Yang1, J Fung, M Edamura

  • 1Department of Physical Therapy, University Alberta, Edmonton, Canada.

The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
|November 1, 1991
PubMed
Summary

Hoffman (H) reflexes in spastic paretic patients showed varied modulation during walking. Many patients exhibited reduced H-reflex modulation, potentially contributing to abnormal gait patterns and clonus.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Rehabilitation Medicine

Background:

  • Spasticity following neurological injury often impairs motor control.
  • The Hoffman (H) reflex is a sensitive measure of spinal reflex excitability.
  • Understanding H-reflex modulation during locomotion is crucial for gait analysis in neurological disorders.

Purpose of the Study:

  • To investigate the modulation patterns of the soleus H-reflex during treadmill walking in patients with spastic paresis.
  • To correlate H-reflex abnormalities with gait characteristics and clonus in these patients.

Main Methods:

  • Elicited soleus H-reflexes during treadmill walking in 21 spastic paretic patients.
  • Recorded electromyograms from soleus and tibialis anterior muscles.

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  • Analyzed H-reflex modulation across different phases of the gait cycle.
  • Examined the effect of stimulus intensity on H-reflex modulation in a subset of patients.

    • Main Results:

    • Most patients displayed reciprocal muscle activation similar to healthy individuals.
    • H-reflex modulation patterns varied significantly, with a common pattern of absent stance phase modulation and reduced swing phase modulation.
    • Abnormally high reflex amplitudes during early stance were observed in some subjects.
    • Reduced H-reflex modulation at higher stimulus intensities suggested reflex loop saturation in some patients, while others showed no modulation even at low intensities.

    Conclusions:

    • Spastic paresis significantly alters H-reflex modulation during walking, often showing less modulation than healthy controls.
    • Abnormal H-reflex activity may contribute to gait disturbances and clonus in spastic paretic patients.
    • The findings highlight the potential for reflex excitability to impact motor function in neurological conditions.