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Abstract: Endplate potentials are common to midfiber myofacial trigger points

  [ 35 votes ]   [ Discuss This Article ] • July 1, 2002

Journal: Am J Phys Med Rehabil 2002 Mar;81(3):212-22
Authors: Simons DG, Hong CZ, Simons LS.
Affiliation: Department of Physical Medicine and Rehabilitation, University of California-Irvine, USA.
NLM Citation: PMID: 11989519

OBJECTIVES: To compare the prevalence of motor endplate potentials (noise and spikes) in active central myofascial trigger points, endplate zones, and taut bands of skeletal muscle to assess the specificity of endplate potentials to myofascial trigger points.

DESIGN: This nonrandomized, unblinded needle examination of myofascial trigger points compares the prevalence of three forms of endplate potentials at one test site and two control sites in 11 muscles of 10 subjects. The endplate zone was independently determined electrically. Active central myofascial trigger points were identified by spot tenderness in a palpable taut band of muscle, a local twitch response to snapping palpation, and the subject's recognition of pain elicited by pressure on the tender spot.

RESULTS: Endplate noise without spikes occurred in all 11 muscles at trigger-point sites, in four muscles at endplate zone sites outside of trigger points (P = 0.024), and did not occur in taut band sites outside of an endplate zone (P = 0.000034).

CONCLUSIONS: Endplate noise was significantly more prevalent in myofascial trigger points than in sites that were outside of a trigger point but still within the endplate zone. Endplate noise seems to be characteristic of, but is not restricted to, the region of a myofascial trigger point.

Source: Co-Cure

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