An experimental study will be conducted to evaluate the effect of a single dry needling session, compared to a sham needling session, on surface EMG activity (signal amplitude and frequency) and pain of the upper trapezius muscle, in office workers with trapezius myalgia.
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Changes in resting surface EMG activity (amplitude, RMS) of the upper trapezius after dry needling or sham needling as assessed by the EMG Noraxon 16k Telemyo Device: EMG Noraxon 16k Telemyo
Timeframe: Immediately after a typing task of 20 minutes, immediately after dry or sham needling, 15 minutes and 30 minutes after dry or sham needling