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Related Experiment Videos

Does methocarbamol affect fatigue markers in the low-back electromyogram?

J Boakes1, J P Peach, S M McGill

  • 1Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|December 5, 1998
PubMed
Summary

Methocarbamol (Robaxin) generally does not significantly alter electromyography (EMG) spectral indices used for assessing muscle fatigue in spine extensors. Further research is needed for definitive conclusions in diverse clinical populations.

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Area of Science:

  • Biomedical Engineering
  • Clinical Biomechanics
  • Neuromuscular Physiology

Background:

  • Electromyography (EMG) is crucial for evaluating muscle performance in low-back pain patients.
  • Patients often receive muscle relaxants before EMG assessments, potentially influencing results.
  • The impact of centrally acting muscle relaxants on EMG-based fatigue indices requires investigation.

Purpose of the Study:

  • To determine if methocarbamol (Robaxin) affects EMG spectral indices of muscle fatigue.
  • To assess the influence of methocarbamol on median power frequencies (MPFs) during fatiguing contractions.

Main Methods:

  • Seven healthy men performed isometric spine extension at 60% MVC.
  • Participants underwent fatigue trials with and without methocarbamol (Robaxin).

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  • EMG spectral analysis focused on median power frequency (MPF) slope and y-intercept in multifidus and erector spinae muscles.

    • Main Results:

    • Methocarbamol (Robaxin) did not significantly alter EMG median power frequency in most tested extensor muscles.
    • A minor exception was noted in one multifidus muscle (L5) on one side.
    • The drug's effect on EMG spectral indices appears minimal in healthy individuals.

    Conclusions:

    • Methocarbamol (Robaxin) likely has minimal impact on EMG spectral indices of muscle fatigue in healthy individuals.
    • The study's small sample size and limited scope necessitate further investigation.
    • Broader research is required to confirm these findings across diverse clinical populations and tasks.