Arm Deceleration

Phase 6- Arm Deceleration:

Arm deceleration begins after release of the baseball. It is the continuation of the downward movement of your arm across your body.


Shoulder Girdle
The scapula on you throwing shoulder continues in protraction 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
Stays flexed to 10˚ with your glove hand elbow by concentrically contracting both heads of the biceps brachii, brachialis, and brachioradialis muscles. Throwing elbow is extended to 180˚ by eccentrically contracting all three heads of the triceps brachii, and anconeus muscles.

Hip Joint
Follow through 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, causing an anterior pelvic tilt.

Knee Joint
The follow through knee flexes slightly by concetrically contracting your biceps femoris, popliteus, semimembranosus and semitendinosus. The opposite knee remains in flexion by concetrically contracting your biceps femoris, popliteus, semimembranosus and semitendinosus.