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Related Experiment Videos

Hamstrings stretch reflex in human spasticity.

D Burke, J D Gillies, J W Lance

    Journal of Neurology, Neurosurgery, and Psychiatry
    |June 1, 1971
    PubMed
    Summary

    In spastic paralysis, hamstring stretch reflexes increase with velocity due to dynamic spindle properties. This reflex pattern explains the absence of the clasp-knife phenomenon in these patients.

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    Area of Science:

    • Neuroscience
    • Physiology
    • Kinesiology

    Background:

    • Spastic paralysis affects muscle reflexes, particularly the stretch reflex.
    • Understanding the mechanisms of spasticity is crucial for developing effective treatments.

    Purpose of the Study:

    • To investigate the characteristics of the hamstring stretch reflex in patients with spastic paralysis.
    • To elucidate the underlying physiological mechanisms contributing to spasticity in these muscles.

    Main Methods:

    • Electromyography was used to measure the stretch reflex response in the hamstrings of 16 patients with spastic paralysis.
    • Varying velocities of stretch were applied to assess reflex changes.

    Main Results:

    • The hamstring stretch reflex amplitude increased with the velocity of stretch.
    • The reflex was most pronounced during the final phase of knee extension.
    • The clasp-knife phenomenon was notably absent in the spastic hamstrings.

    Conclusions:

    • Dynamic properties of primary spindle endings contribute significantly to the observed stretch reflex patterns.
    • Static properties of spindle endings and differential reflex effects of group II afferent fibers explain the unique reflex characteristics in spastic muscles.

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