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Neuronal mechanisms underlying physiological tremor.

J H Allum, V Dietz, H J Freund

    Journal of Neurophysiology
    |May 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

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    Physiological tremor force spectra change with contraction strength, with higher frequencies emerging as force increases. This suggests tremor is driven by unfused motor unit twitches and motoneuron pool output.

    Area of Science:

    • Neuroscience
    • Biomechanics
    • Motor Control

    Background:

    • Physiological tremor is a common phenomenon during voluntary muscle contractions.
    • Previous studies investigated single motor-unit activity and correlations in tremor.
    • Understanding the force generation mechanisms underlying tremor is crucial.

    Purpose of the Study:

    • To analyze the power spectra of tremor force during isometric contractions.
    • To investigate how tremor characteristics change with varying force levels.
    • To test the hypothesis linking tremor spectra to motor unit twitch fusion.

    Main Methods:

    • Recorded tremor force during stationary isometric contractions of intrinsic hand muscles.
    • Subjects maintained steady force levels from weak (0.2 kg) to strong (7 kg).

    Related Experiment Videos

  • Analyzed force power spectra and compared with animal experiments stimulating nerve filaments.

    • Main Results:

    • Tremor amplitude increased with contraction strength.
    • Power spectra showed a peak at 6-10 Hz, stable across force levels.
    • Higher frequencies (>20 Hz) became significant with stronger contractions, correlating with unfused twitches.

    Conclusions:

    • Tremor spectra are explained by unfused motor unit twitches (6-25 Hz) and mechanical damping.
    • Low-frequency tremor is attributed to motoneuron pool output fluctuations.
    • Findings support a model where tremor arises from the summation of motor unit contractions.