Supports· moderateVASO-E001
Spontaneous EMG activity confined to the trigger-point nidus
- what the source states
- Monopolar needle EMG recorded simultaneously from trapezius trigger points and adjacent non-tender fibers found sustained spontaneous activity in the 1–2 mm nidus of all trigger points and none in the non-tender sites; amplitude was higher in tension-headache and fibromyalgia patients than in normals. The authors hypothesized sympathetically activated intrafusal (spindle) contractions.
- what we infer
- Whatever a knot is, it is electrically maintained: a discrete island of ongoing activity in muscle that is nominally at rest — state, not scar.
- limitations
- 1993, small sample, one lab; the signal's generator is still contested (endplate potentials vs spindles).
- The recorded activity is skeletal-muscle electrophysiology; nothing here measures vasculature.