Journal Article10.1097/00007632-199310000-00015
Myofascial trigger points show spontaneous needle EMG activity.
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TL;DR: The authors hypothesize that TrPs are caused by sympathetically activated intrafusal contractions.
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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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Citations
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TL;DR: The cognitive functioning of patients suffering from temporomandibular disorders at various stages of prosthetic treatment is described in detail, with particular emphasis on the experience of chronic pain.