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Spine (Phila Pa 1976). 1993 Oct 1;18(13):1803-7.

Myofascial trigger points show spontaneous needle EMG activity.

Author information

1
Department of Neurosciences, University of California, San Diego.

Abstract

Monopolar needle electromyogram (EMG) was recorded simultaneously from trapezius myofascial trigger points (TrPs) and adjacent nontender fibers (non-TrPs) of the same muscle in normal subjects and in two patient groups, tension headache and fibromyalgia. Sustained spontaneous EMG activity was found in the 1-2 mm nidus of all TrPs, and was absent in non-TrPs. Mean EMG amplitude in the patient groups was significantly greater than in normals. The authors hypothesize that TrPs are caused by sympathetically activated intrafusal contractions.

PMID:
8235865
[Indexed for MEDLINE]

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