In this phase, the pitches lifts his front leg to maximum knee height in a very balanced position. Then, the front leg goes down and forward while the arms separate, swing down, then back up.
Lead foot should land in line with stance foot, if too far closed, pelvic rotation may be limited causing pitcher to throw across his body Supraspinatus, infraspinatus, and teres minor ER the shoulder Serratus anterior and scapular retractors (midle trap, rhomboid, and levator) position glenoid in upward rotation and retraction, providing stable base on which humerus can rotate
RC muscles provide compressive force during late cocking, resisting shoulder distraction caused by torque of rapidly rotating upper torso Teres minor and infraspinatus are active delivering extreme amounts of ER Supraspinatus is least active of RC muscles during this phase
Pitchers at various competition levels show varying muscle recruitment patterns and use of kinetic chain to differentially generate top velocities -pro pitchers predominantly use subscap and lats for acceleration, whereas amateurs use more of RC muscles with an active pec minor and relatively silent lats
Michael D. Satterley PT, DPT, CIMT, CSCS Tidewater Physical Therapy, Inc. Oyster Point Physical Therapy Clinic in Newport News, Va. www.tpti.com THE THROWING SHOULDER: PREVENTING OVER-USE INJURIES
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