Brief summary: The purpose of this study is to determine the effect of Dry Needling (DN) on electromyographic activity in different situations at the latent trigger point (LTrP) point of the upper trapezius. Randomized controlled trial, in parallel with the crossover control design. Two groups with LTrP in the upper trapezius, and the DN group or the Sham-Dn group will be randomly selected.
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Changes in resting surface EMG activity (amplitude, RMS)
Timeframe: Baseline, at 30 minutes after treatment, at 24 hours after treatment, at 72 hours after treatment