The purpose of this study is to determine whether application of Dry Needling (DN) is effective for reduced on Stiffness in Latent trigger point (LTrP) of upper trapezius. The secondary purposes are to determine the correlation on two elastography for stiffness measure (Shear-wave elastography and Strain elastography). 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 on Stiffness (Shear wave elastography and Strain Elastography)
Timeframe: Baseline, at 30 minutes after treatment, at 24 hours after treatment, at 72 hours after treatment