Deceleration

Phase 5

Deceleration- This is occurs after the ball is released, and the arm is slowing down on the way down.

Shoulder Girdle
The scapula on you throwing shoulder continues in protraction by using your serratus anterior and pectoralis minor muscles. The scapula on your glove hand shoulder stays retracted using the middle/lower fibers of your trapezius muscle and rhomboid muscles.

Shoulder Joint
Throwing Hand- Continues to diagonally adduct shoulder joint by concentrically contracting your pectoralis major, anterior deltoid, and coracobrachialis muscles.
Glove Hand- Shoulder joint stays adducted by eccentrically contracting your latissimus dorsi, teres major, and lower pectoralis major muscles.

Elbow Joint
Your glove hand elbow concentrically contracting the biceps brachii, brachialis, and brachioradialis muscles.
Throwing elbow is extended by eccentrically contracting all three heads of the triceps brachii, and anconeus muscles.

Hip Joint
throwing leg causes the hip to flex and internally rotate. Flexion occurs when by contracting concentrically with your iliacus, psoas major and minor, rectus femoris, sartorius, pectineus, and tensor fasciae latae muscles, causing an anterior pelvic tilt.
Lead foot keeps the opposite side of the hip remains slightly flexed by concentrically contracting your iliacus, psoas major and minor, rectus femoris, sartorius, pectineus, and tensor fasciae latae muscles.

Knee Joint
The throwing knee flexes slightly by concentrically contracting your biceps femoris, popliteus, semimembranosus and semitendinosus.
The non throwing knee remains in flexion by concetrically contracting your biceps femoris, popliteus, semimembranosus and semitendinosus.