Article

Myofascial Trigger Points Show Spontaneous Needle EMG Activity

Department of Neurosciences, University of California, San Diego.
Spine (Impact Factor: 2.45). 11/1993; 18(13):1803-7. DOI: 10.1097/00007632-199310000-00015
Source: PubMed

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.

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