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Related Experiment Videos

Endplate potentials are common to midfiber myofacial trigger points.

David G Simons1, Chang-Zern Hong, Lois Statham Simons

  • 1Department of Physical Medicine and Rehabilitation, University of California-Irvine, USA.

American Journal of Physical Medicine & Rehabilitation
|May 7, 2002
PubMed
Summary

Endplate noise, a potential biomarker for myofascial trigger points (MTrPs), was more common in MTrPs than other muscle zones. This finding suggests endplate noise is characteristic but not exclusive to MTrPs.

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Area of Science:

  • Neuromuscular physiology
  • Skeletal muscle research
  • Pain medicine

Background:

  • Myofascial trigger points (MTrPs) are associated with distinct electrical phenomena.
  • Endplate potentials, including noise and spikes, are implicated in muscle function and dysfunction.

Purpose of the Study:

  • To investigate the prevalence of endplate potentials in active MTrPs compared to endplate zones and taut bands.
  • To determine the specificity of endplate potentials to MTrPs.

Main Methods:

  • Needle examination of 11 muscles in 10 subjects.
  • Comparison of endplate potential prevalence at trigger points, endplate zones, and taut bands.
  • Electrical identification of endplate zones and MTrPs.

Main Results:

Related Experiment Videos

  • Endplate noise without spikes occurred in all trigger-point sites.
  • Endplate noise was found in 4 muscles at endplate zones outside MTrPs (P=0.024).
  • Endplate noise did not occur in taut bands outside endplate zones (P=0.000034).

Conclusions:

  • Endplate noise is significantly more prevalent in MTrPs than in adjacent endplate zones.
  • Endplate noise appears characteristic of, but not exclusive to, MTrP regions.