1.What type of contraction is being performed in the throwing phase of a basebal
ID: 3511079 • Letter: 1
Question
1.What type of contraction is being performed in the throwing phase of a baseball pitch and in follow-through phase?
2. Name 3 muscles that attach on or around the lateral epicondyle of the humerus and describe one eccentric movement for each muscle listed.
3. Please describe the action of the humeroulnar joint and the position of the proximal radioulnar joint during phase throwing phase of a baseball pith. What planes of motion and axes of rotation do these actions take place in? What muscles are contracting to perform the movement/position at each joint?
Explanation / Answer
Answer:
1: In throwing phase: Maximum voluntary isometric contraction of upper trapezius, serratus anterior and anterior deltoid. Rotor cuff muscles are inactive during wind up phase, during cocking phase deltoid, supraspinatus, infraspinatus and teres minor is active, during acceleration, triceps, pectoralis major, lattisimus dorsi and serratus anterior are active.
During follow through: the body rebalances and stops forward movement and muscle activity Returns to resting levels.
2. The three muscles are Extensor carpi radialis brevis, Extensor carpi ulnaris and Extensor digitorum. In the eccentric movement the muscles are stretched out.
3. Humeroulnar joint allows for movement of flexion, extension and circumduction.
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