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Related Experiment Videos

Force and surface mechanomyogram relationship in cat gastrocnemius.

C Orizio1, R V Baratta, B H Zhou

  • 1Dipartimento di Scienze Biomediche e Biotecnologie, Cattedra di Fisologia Umana, Università degli Studi di Brescia, Italy. orizio@med.unibs.it

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|March 31, 1999
PubMed
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This study compared muscle force and mechanomyogram (MMG) during nerve stimulation in cats. Results show force and lateral displacement are not linearly related, indicating different muscle components influence force generation and dimensional changes.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Muscle Physiology

Background:

  • Electrical stimulation of motor nerves is used to study muscle function.
  • Mechanomyography (MMG) measures muscle mechanical responses, but its relationship with force is not fully understood.

Purpose of the Study:

  • To compare muscle force (F) and muscle transverse diameter changes (measured via MMG) during electrical stimulation of the motor nerve.
  • To investigate the relationship between force and lateral displacement under varying stimulation frequencies and motor unit recruitment patterns.

Main Methods:

  • Stimulation of medial gastrocnemius motor nerves in four cats at fixed and sweeping frequencies.
  • Recording muscle surface displacement using a laser distance sensor to obtain the surface mechanomyogram (MMG).

Related Experiment Videos

  • Analyzing force and MMG signals during different electrical stimulation protocols, including varying firing rates and motor unit recruitment times.

    • Main Results:

    • Both average force (F) and MMG increased with stimulation firing rate (FR).
    • At low frequencies (5 Hz), MMG oscillations were larger than force oscillations relative to 50 Hz values.
    • The MMG signal's rising phase consistently preceded the force signal's rising phase.
    • Force increased less in the first half of recruitment time compared to the second half, while MMG showed opposite behavior.

    Conclusions:

    • Muscle force and lateral displacement are not linearly related.
    • The distinct behaviors of force and MMG during varying motor unit activation suggest that different components of the muscle mechanical model influence force generation and dimensional changes.