A point 2 cm to the side of the midpoint of a line between the posterior margin of the acromion and the seventh cervical vertebra will be used for the positioning of the electrodes on the descending fibers of the trapezius muscle. Prior to the reading, the participant will be instructed to remain seated in a chair, with bare shoulder and arm, back straight, knees flexed at 90º and feet apart for the collection of MVC. Two non-elastic straps attached to each side of the base of the chair will be used to resist the elevation of the shoulders during the MVC reading. The volunteer will be instructed to raise the shoulders with maximum force for five seconds. This procedure will be performed three times with a one-minute rest period between readings and the largest value of the three readings will be used for the normalization of the EMG data of the descending fibers of the trapezius muscles.