IRCT20190411043241N1 IRCT 2019-09-02 Tehran University of Medical Sciences Use of laser beams on postneedling soreness and treatment of chronic cervical pain Short Term Effects of Low versus High Power Lasers on Soreness following Dry Needling at Neck Myofascial Pain Syndrome induced by Active Trigger Points of Upper Trapezius Muscle. 2019-06-30 anticipated 45 Complete https://irct.ir/trial/38815 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Randomization description: Balanced Block Randomizatin, Blinding description: Using laser off in the placebo group will cause blindness to the participants. Assessor will not be aware about patient's group, because assessment will do in another room. N/A Active Trigger Points in Upper Trapezius Muscle. Intervention 1: Intervention group: High Power Laser: In this group, the dry needle is applied to the most active trigger point in the upper trapezius muscle. Immediately a laser with a power of 1 watts / cm2 is applied for 6 seconds and with a total energy of 6 joules . Intervention 2: Intervention group: Low Power Laser: In this group, the dry needle is applied to the most active trigger point in the upper trapezius muscle. Immediately a laser with a power of 100 miliwatts / cm2 is applied for 60 seconds and with a total energy of 6 joules . Intervention 3: Control group: Sham Laser: In this group the dry needle is applied to the most active trigger point in the upper trapezius muscle. Immediately the off laser probe will be use at the point for 1 minute . Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information.