IRCT2013031612828N1 IRCT 2013-04-04 Tehran University of Medical Sciences The neurophysiological effects of dry needling in patients with upper trapeizus myofascial trigger points Effect of dry needling on neuromuscular junction response and sympathetic skin response in patients with upper trapeizus myofascial trigger points compared with healthty subjects 2013-04-04 anticipated 30 Complete https://irct.ir/trial/12835 interventional Randomization: Not randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Treatment, Other design features: This study is a controlled clinical trial designed to investigate the effectiveness of dry needling on neuromuscular junction response and sympathetic outflow in patients with upper trapeizus MTrPs compared with healthy individual matched group. N/A myofascial trigger point. Intervention 1: The sterile acupuncture needles of 0.30 mm diameter and 50 mm long will be used for both groups. The needle will be inserted into the skin over the palpated trigger point and will be advanced until it reaches the trigger point. Each trigger point will be repeatedly needled for 1 – 2 minutes. Intervention 2: The sterile acupuncture needles of 0.30 mm diameter and 50 mm long will be used. The needle will be inserted into the skin over the Trigger Point equivalent of upper terapezius in healthy subjects. Each point will be repeatedly needled for 1 – 2 minutes.