The purpose of this study is to determine whether application of Dry Needling (DN) is effective for improved Muscle Mechanical Properties and Muscle Contractility in Latent Trigger Points point (LTrP) of upper trapezius. Randomized controlled trial, in parallel with cross-control design. Two groups with LTrP in upper trapezius, and will be randomly selected to DN group or Sham-Dn group.
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Change in Stiffness
Timeframe: Baseline, at 30 minutes after treatment, at 24 hours after treatment, at 72 hours after treatment
Change in Maximal Radial Displacement (Dm)
Timeframe: Baseline, at 30 minutes after treatment, at 24 hours after treatment, at 72 hours after treatment