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PURPOSE: To investigate the muscle firing patterns of select lower extremity muscles during the pitching motion.

METHODS: Eleven injury free college aged males with previous pitching experience performed 10 baseball pitches (5 with EMG electrodes on stride leg and 5 with EMG electrodes on trail leg) at a minimum required velocity of 70 mph off of a standard indoor pitching mound. Pitch velocity was monitored and controlled using a JUGS radar gun. Pitch trials that did not meet the minimal required 70 mph velocity were not used. Bilateral surface electromyography (Noraxon USA, Inc. Scottsdale, AZ) recorded muscle activity at 1000Hz during the pitching trials from the biceps femoris (BF), rectus femoris (RF), and vastus medialis (VM). Electromyography signals were rectified and smoothed (50ms RMS method). The pitch was divided into three phases (P1-initiation of pitch to stride foot contact (SFC), P2-SFC to …