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  • Title: Coupling between human muscle spindle endings and motor units assessed using spike-triggered averaging.
    Author: Gandevia SC, Burke D, McKeon B.
    Journal: Neurosci Lett; 1986 Nov 11; 71(2):181-6. PubMed ID: 2946995.
    Abstract:
    The electromyographic activity (EMG) generated by voluntary contraction of a muscle was averaged using the potentials from 18 identified muscle spindle afferents as a trigger. In post-spike averages of 1000-10,000 sweeps, no evidence of reflex excitation of the homonymous motoneurone pool was detected. In pre-spike averages there was no evidence of a motor-unit EMG potential that was closely correlated to the trigger spike. A single spindle afferent has only a weak reflex effect on an active motoneurone pool and must be part of a synchronized volley to affect motoneurone discharge significantly. No evidence was found for spindle activation via beta-motoneurones in weak voluntary contractions.
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