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Related Experiment Videos

Motor unit analysis. Comparison between concentric and monopolar electrodes.

W S Pease1, B L Bowyer

  • 1Department of Physical Medicine, Ohio State University, Columbus 43210.

American Journal of Physical Medicine & Rehabilitation
|February 1, 1988
PubMed
Summary
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Needle electrode type minimally impacts motor unit action potential (MUAP) measurements. Current technology shows no significant clinical differences in amplitude or duration between concentric and monopolar electrodes for MUAP analysis.

Area of Science:

  • Neurology
  • Electrophysiology
  • Biomedical Engineering

Background:

  • Previous studies suggest needle electrode type influences motor unit action potential (MUAP) measurements.
  • Monopolar electrodes have been reported to yield higher MUAP amplitudes than concentric electrodes.
  • The clinical significance of these reported differences with current technology remains unclear.

Purpose of the Study:

  • To investigate and compare motor unit action potential (MUAP) measurement parameters using concentric versus monopolar needle electrodes.
  • To determine if current electromyography technology yields clinically significant differences between these electrode types.

Main Methods:

  • Fifteen healthy volunteers underwent electromyography of the extensor digitorum communis muscle.

Related Experiment Videos

  • Motor unit action potentials (MUAPs) were recorded using both concentric and monopolar needle electrodes with a 20 Hz to 10 kHz filter band-pass.
  • Four first-recruited MUAPs were analyzed for amplitude and duration, with amplitudes maximized and consecutive MUAPs averaged.

    • Main Results:

    • Mean MUAP amplitude was 1038 (+/- 369) microV for monopolar and 912 (+/- 315) microV for concentric electrodes.
    • Mean MUAP duration was 10.8 (+/- 2.0) ms for monopolar and 9.7 (+/- 1.7) ms for concentric electrodes.
    • No statistically or clinically significant differences were found between the measurement values obtained from the two needle types.

    Conclusions:

    • Current electromyography technology minimizes differences in motor unit action potential (MUAP) measurements between concentric and monopolar needle electrodes.
    • The choice of needle electrode type (concentric vs. monopolar) has minimal clinical significance for MUAP analysis in healthy individuals.
    • These findings suggest that MUAP measurements are reliable across both electrode types with modern equipment.