Pitching Wrist Joint Actions 1. Transition During transitions, wrist joint muscles maximally mioanglosly extend and radially flex metacarpals. From maximal wrist joint extensions, pitchers prepare to maximally flex wrist joints through releases. From maximal wrist joint radially flexions, pitchers prepare to maximally ulnarly flex wrist joints through releases when specific pitches require. During upper arm accelerations, wrist joint muscles isoanglosly flex and ulnarly flex extended and radially flexed metacarpals.
Uniform accelerations require uniform forces.
Therefore, wrist joint muscles uniformly isoanglosly flex and ulnarly flex metacarpals. During forearm accelerations, wrist joint muscles maximally mioanglosly flex and ulnarly flex metacarpals. Wrist joint actions occur immediately prior to pitch releases. During decelerations, wrist joint musles plioanglosly extend and ulnarly flex metacarpals. After releasing pitches, baseballs' resistances disappear and metacarpals accelerate.