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Experimental setup for the measurement of the surface EMG, MMG, FORCE, and US onsets from the right (dominant) rectus femoris muscle during isometric contraction of the quadriceps femoris muscle. The subject is seated with the back inclination of 80° and right knee was adjusted at flexion angle of 30° below the horizontal plane on a calibrated dynamometer (Humac/Norm Testing and Rehabilitation System, Computer Sports Medicine, Inc., MA, USA).
