This is Dr. Mike Marshall's "pitching forearm flyout." I have shortened the name for brevity.
When the pitching elbow moves in a pronounced arc, inertia slings the forearm away from the body. To keep the olecranon of the ulna from slamming into the olecranon fossa of the humerus, the brachialis muscle eccentrically contracts.
Reciprocal inhibition limits the contraction of the triceps brachii while the brachialis is contracting. The brachialis must relax before the triceps can fully contract. When forearm flyout occurs, the triceps brachii is not able to meaningfully contribute to the pitch.
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