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The relationship between electromyogram and muscle force

A L Hof1

  • 1Department of Medical Physiology, University of Groningen, The Netherlands. a.l.hof@med.rug.nl

Sportverletzung Sportschaden : Organ Der Gesellschaft Fur Orthopadisch-Traumatologische Sportmedizin
|November 14, 1997
PubMed
Summary

Interpreting electromyogram (EMG) signals requires careful consideration of muscle force relationships. Factors like co-contraction, muscle properties, and signal delays influence accurate force estimation from EMG data.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • The electromyogram (EMG) is a common tool for assessing muscle activity.
  • Interpreting the relationship between EMG signals and muscle force is complex.
  • Simultaneous activation of multiple muscles around a joint complicates direct force-EMG correlations.

Purpose of the Study:

  • To provide guidelines for interpreting electromyogram (EMG) signals in relation to muscle force.
  • To highlight factors that affect the linearity of the force-EMG relationship.
  • To inform researchers about the nuances of EMG-force analysis.

Main Methods:

  • Review of existing literature on electromyogram (EMG) signal processing and interpretation.
  • Analysis of the relationship between smoothed rectified EMG (SRE) and muscle force under various conditions.

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  • Consideration of factors including co-contraction, muscle mechanics, and signal dynamics.

    • Main Results:

    • A generally linear relationship exists between muscle force and smoothed rectified EMG (SRE) during static isometric contractions.
    • This linear relationship may not hold for the total joint moment due to multi-muscle co-activation.
    • Muscle force signals exhibit lower frequency content than rectified EMG, and a 50-200 ms delay exists between EMG and muscle force.

    Conclusions:

    • Accurate interpretation of EMG requires accounting for co-contraction, muscle properties (force-length-velocity), and signal transmission delays.
    • EMG during concentric contractions are typically larger than during isometric actions.
    • Researchers must consider these factors for precise EMG-based force estimations.