Phases of Throwing There are 5 main phases of throwing wind up (see below) cocking acceleration deceleration follow-through Biomechanics scapula must work in concert with humerus to maintain glenohumeral stability the entire throwing motion takes approximately 2 seconds with wind up and acceleration phases taking approximately 75% of time (1.5 seconds) 1. Wind Up Description minimal force on the shoulder during first stage Muscle activity rotator cuff muscles are inactive during this phase 2. Cocking Sometimes described as 2 sub-phases early cocking peak muscle activation deltoid late cocking high torque phase with maximal shoulder external rotation peak muscle activation supraspinatus infraspinatus teres minor Associated pathology internal Impingement GIRD (glenohumeral internal rotation defect) 3. Acceleration Description rotates ball to release point Muscle activity early muscle activation triceps late muscle activation pectoralis major latissimus dorsi serratus anterior 4. Deceleration Description center of gravity moves over plantar foot Muscle activity eccentric contraction of all muscles is required to slow down arm motion highest torque phase Associated pathology recognized as the most harmful phase of throwing associated injuries superior labrum (SLAP lesion) biceps tendon injury brachialis injury teres minor injury 5. Follow-through Description phase where body rebalances and stops forward motion Muscle activity muscle activity returns to resting levels
QUESTIONS 1 of 3 1 2 3 Previous Next Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK Sorry, this question is for PEAK Premium Subscribers only Upgrade to PEAK (OBQ11.107) Which of the following is true of the scapula during an overhead throwing motion? Review Topic QID: 3530 1 It maximally retracts on ball release 2% (55/2727) 2 It protracts during late cocking to prevent impingment on the rotator cuff 17% (459/2727) 3 It must rotate in the cocking and acceleration phases to prevent impingement on the rotator cuff 74% (2025/2727) 4 It must remain fixed during the throwing motion to impart maximal energy 4% (120/2727) 5 It has no effect on concavity-compression 1% (38/2727) ML 2 Select Answer to see Preferred Response PREFERRED RESPONSE 3
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