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Related Experiment Videos

The relation between the surface electromyogram and muscular force.

H S Milner-Brown, R B Stein

    The Journal of Physiology
    |April 1, 1975
    PubMed
    Summary
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    Motor unit amplitude in the first dorsal interosseus muscle correlates with recruitment force, while duration remains constant. Motor unit recruitment is key at low forces, with firing rate dominating at higher forces.

    Area of Science:

    • Neuromuscular Physiology
    • Human Motor Control

    Background:

    • Understanding the relationship between motor unit activity and muscle force production is crucial for interpreting electromyography (EMG) signals.
    • Previous studies suggest a linear relationship between surface EMG and muscle force, but the underlying motor unit behavior is complex.

    Purpose of the Study:

    • To investigate the relationship between individual motor unit properties and their contribution to the surface electromyogram (EMG) in the first dorsal interosseus muscle.
    • To analyze how motor unit recruitment and firing rate influence the overall EMG signal across different force levels.

    Main Methods:

    • Needle electrodes were used to record motor unit activity in the first dorsal interosseus muscle of healthy subjects.
    • Signal averaging techniques were employed to determine the specific waveform contributed by each motor unit to the surface EMG.

    Related Experiment Videos

  • The rectified surface EMG was calculated as a function of generated force.

    • Main Results:

    • Motor unit waveform amplitude increased with the square root of recruitment force, while duration was force-independent.
    • Motor units are uniformly distributed within the muscle, with potentially dispersed muscle fibers.
    • Motor unit recruitment significantly contributes to EMG at low forces; firing rate becomes more influential at higher forces.

    Conclusions:

    • The study elucidates the non-linear summation of motor unit potentials and contractile responses, explaining the observed linear relationship between rectified surface EMG and muscle force.
    • Findings provide insights into the physiological basis of EMG signal generation during voluntary contractions.