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Related Experiment Videos

Functional compensation in partially denervated muscles.

A J McComas, R E Sica, M J Campbell

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

    Partially denervated muscles show remarkable functional compensation, maintaining normal twitch tensions until very few motor axons remain. Some motor unit twitches may even slow down in chronic denervation.

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    Area of Science:

    • Neurology
    • Muscle Physiology
    • Motor Unit Analysis

    Background:

    • Chronic motor denervation affects muscle function.
    • Understanding compensatory mechanisms in partially denervated muscles is crucial.

    Purpose of the Study:

    • To compare surviving motor unit numbers with twitch tensions in chronic motor denervation.
    • To investigate factors contributing to functional compensation in partially denervated muscles.
    • To analyze changes in motor unit twitch speeds.

    Main Methods:

    • Comparison of motor unit counts and muscle twitch tensions.
    • Analysis of extensor digitorum brevis muscle function in patients.
    • Assessment of twitch speeds in partially denervated muscles.

    Main Results:

    • Significant functional compensation observed in partially denervated muscles.
    • Abnormally small twitches typically occurred when less than 10% of motor axons remained.
    • Marked variability in twitch speeds among patients, with some motor units showing slower twitches than normal.

    Conclusions:

    • Partially denervated muscles exhibit substantial compensatory capacity.
    • Motor unit survival below 10% is a critical threshold for significant functional decline.
    • Alterations in motor unit twitch speed, including slowing, are potential adaptations to chronic denervation.

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