Objective:Myofascial trigger point(MTP) is one of the main causes of musculoskeletal disorders.The latent type of this point is relevant with different of this disorders.Upper trapezius muscle is probably most involved by MTP.The main purpose of this study was to compare the effect of Pressure Release(PR) and Dry Needling(DN) on the treatment of latent trigger point of upper trapezius muscle. Method and Material: forty subjects with diagnosis of latent upper trapezius MTP participated in this study.Subjects were randomly divided into 2 groups(PR and DN).DN group were treated 2 sessions per week and PR group were treated 3 sessions per week.the course of treatment was two weeks.Pain intensity,pain pressure threshold(PPT),active cervical range of motion(AROM)include lateral flextion and rotation in both side were assessed in every session.one-way mixed model ANOVA was used to investigate the effect of treatment and compare groups. Result:Significant decrease of pain and increase of ROM and PPT after treatment in both group occurred(P>.001) and also DN group had better effect related to PR group in all parameters(P>.001). Conclusion:Although both of DN and PR are effective treatment for MTP but the effectiveness of DN Method may be more in PPT and ROM.

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