Effects of Transcranial Direct Current Stimulation Versus Sham in Subacromial Pain Syndrome

Application of active direct current stimulation for 20 minutes, at an intensity of 2mA, with 30s of ramp up and ramp down, for 5 consecutive days. The anode will be positioned on M1 (C3) contralateral to the painful shoulder; The reference electrode (cathode) will be placed in the supraorbital region contralateral to the anode (Fp2). Direct current will be delivered through two 35cm2 surface sponge electrodes (7x5) soaked in saline solution, using a portable neuromodulator. During the entire stimulation, volunteers will remain seated in an air-conditioned and quiet place.

Application of active direct current stimulation for 20 minutes, at an intensity of 2mA, for 5 consecutive days, administered in the same way as the experimental intervention. However, the stimulator will be turned off after 30 seconds and the volunteers will not receive current for the rest of the session.