When pitchers abduct humeruses overhead beyond vertical posteriorly, shoulder joint extension muscles drive humerus toward home plates. Pitchers reduce pitching arm centrifugal stress with near vertical upper arm accelerations. During forearm accelerations, shoulder joint muscles mioanglosly inwardly rotate humeruses. Until elbow and forearm joints accelerate forearms, pitchers cannot powerfully inwardly rotate shoulder joints. During decelerations, shoulder joint muscles plioanglosly flex, horizontally extend and abduct humeruses.
Flexions stop humeral extensions.
Horizontal extensions stop horizontal flexions. Abductions maintain vertical humeruses. The table of contents for this eBook provide an easy to use navigation tool for Dr. Marshall's superb text. The entire text on this page and other pages of the book are copyrighted by the author Dr. Mike Marshall. This book is presented here at Baseball Almanac with express written permission of the author.