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Related Experiment Videos

Evaluation of human dynamic contraction by phonomyography.

M Petitjean1, B Maton, J C Cnockaert

  • 1Laboratoire de Physiologie de la Motricité, Centre Hospitalier Universitaire Pitié-Salpêtrière, Paris, France.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 1, 1992
PubMed
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The phonomyogram (PMG) conveniently measures muscle tension during dynamic contractions. Its signal linearly relates to force and acceleration, proving useful for evaluating muscle activity in various movements.

Area of Science:

  • Biomechanics
  • Muscle Physiology
  • Biomedical Engineering

Background:

  • The phonomyogram (PMG), or acoustic myogram, is known to increase with force during isometric muscle contractions.
  • Its utility in dynamic contractions, particularly concerning varying inertias, requires further investigation.

Purpose of the Study:

  • To investigate the relationship between PMG and muscle force during dynamic elbow flexion contractions against different inertias.
  • To compare PMG with surface electromyogram (EMG) and mechanical acceleration during these dynamic contractions.

Main Methods:

  • Simultaneously recorded PMG, surface EMG from biceps and brachioradialis, and angular acceleration during self-initiated elbow flexions.
  • Movements were performed against two different inertias over a 30-degree range.

Related Experiment Videos

  • Integrated PMG (iPMG) and integrated EMG (iEMG) were calculated from signal onset to the end of the acceleration phase. Phono- and electromechanical delays were also measured.

    • Main Results:

    • A linear relationship was observed between iPMG and force, with the slope independent of inertia.
    • Both iPMG and iEMG showed a linear relationship with angular acceleration, with slopes dependent on inertia.
    • Phonomechanical delay followed EMG onset but preceded acceleration onset, suggesting PMG reflects muscle contractile element tension.

    Conclusions:

    • The phonomyogram (PMG) provides a convenient method for evaluating muscle tension during dynamic human contractions.
    • The linear relationship between iPMG and force, independent of inertia, highlights its potential as a simple force transducer.
    • PMG's ability to reflect muscle contractile element activity makes it a valuable tool in biomechanical assessments.