No Increased Neuromuscular Jitter at Rabbit Skeletal Muscle Trigger Spot Spontaneous Electrical Activity Sites

Objective: One of the important characteristics of myofascial trigger point [MTrP] is spontaneous electrical activity [SEA]. Spontaneous electrical activity is recorded from an active locus [a basic unit] of MTrP and has been considered as an abnormal endplate potential, which might be due to excessive acetylcholine release in neuromuscular junction. This study is designed to test the hypothesis that active loci in MTrPs are related to neuromuscular transmission disorder.Methods: Twenty-one adult New Zealand rabbits were anesthetized and their biceps femoris were exposed to localize myofascial trigger spot [MTrS, equivalent to MTrP in human]. A monopolar needle electrode was first used for searching SEA in an MTrS region. Then, a single fiber electromyography [SFEMG] electrode was used to collect the neuromuscular jitter at the site where SEA was recorded. The same procedure was performed at the normal muscle site [no SEA recorded] in contralateral limb to collect the neuromuscular jitter as a control. Me...