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Phonomyogram and electromyogram relationships with isometric force reinvestigated in man
B Maton1, M Petitjean, J C Cnockaert
1Laboratoire de Physiologie de la Motricité, URA CNRS 385, CHU Pitié-Salpétrière, Paris, France.
Summary
Phomomyogram (PMG) and electromyogram (EMG) recordings show a quadratic relationship with muscle force. PMG is a valid index for monitoring isometric muscle force, similar to EMG.
Area of Science:
- Biomechanics
- Muscle Physiology
- Biomedical Engineering
Background:
- Muscle contractions produce acoustic signals detectable by microphones.
- Electromyography (EMG) is a standard method for assessing muscle electrical activity.
- Investigating non-invasive methods to monitor muscle function is crucial.
Purpose of the Study:
- To evaluate the potential of phomomyography (PMG) as a tool for monitoring muscle force.
- To compare PMG recordings with electromyography (EMG) and external force measurements.
- To assess the relationship between PMG, EMG, and isometric muscle force.
Main Methods:
- Simultaneous recordings of PMG and monopolar EMG from the biceps brachii muscle during isometric contraction.
- Measurement of external flexion force.
- Analysis of PMG and EMG amplitude and spectral characteristics in relation to muscle force.
- Comparison of recordings in different hand positions (prone vs. supine).
Main Results:
- PMG amplitude demonstrated a quadratic relationship with muscle force, mirroring EMG.
- The spectral properties of PMG and EMG changed similarly with increasing force.
- PMG was identified as a valid, albeit slightly more variable, index of isometric muscle force.
- Hand position influenced both PMG and EMG amplitudes, indicating selective muscle recording.
Conclusions:
- Phomomyography (PMG) is a viable non-invasive technique for assessing isometric muscle force.
- PMG offers a complementary approach to EMG for muscle function monitoring.
- Further research may explore PMG applications in various physiological and clinical settings.