Chris Neault writes for The Hardball Times and also maintains his own website over at The Disabled List Informer. He recently commented on my voiceover about Max Scherzer, liking what he saw, but adding this clarification:

Where Boddy is incorrect, is that he describes the "decelerator muscles" after release as the anterior shoulder. In fact, this region is not decelerating anything at this phase of the pitching motion.

The decelerator muscles at this phase are actually in the posterior aspect of the shoulder, i.e. the rotator cuff - particularly the Infraspinatus, Teres Minor, and Supraspinatus - as well as the Triceps (preventing the elbow from flexing), Lower Trapezius/Rhomboids (decelerating the Scapula), the Latissimus Dorsi, which decelerates the trunk as well as the assists in preventing the upper arm from crossing the body), and the Supinator and Wrist Extensors, which decelerate the forearm from continuing into forearm pronation and wrist flexion.

...The anterior shoulder is not actively decelerating anything at this point. The joint structures and passive stabilizers (ligaments, capsule, articulating surfaces etc.) are assisting in deceleration, but the muscles are not.
I dispute nothing in the quoted section - I actually meant to say the posterior shoulder muscles and the back muscles do most of the decelerating, and mixed the words up. I spend most of my time speaking about the anterior shoulder due to all the talk on my website about being late at footstrike, forearm flyout, and the arm violently laying back in shoulder external rotation that I haven't talked much about the bad followthrough phases of people like Scherzer. Regardless, the mistake is in the voiceover and I apologize - I was a bit nervous and didn't have my copy of Gray's Anatomy open like I typically do. :)

This is a good a time as any to say that the folks over at RPM Pitching do great work on trying to actively involve the latissimus dorsi and pronator teres major in the pitching delivery while reducing or even eliminating horizontal shoulder abduction (better known as scapular loading). Bill Peterson has been a wealth of information for me, and I credit him with much of what I know, so if that type of thing interests you, go check out the website. His son, a former Dr. Marshall client, has the RPM Pitching motion mastered and I have seen the video of little to no scapular loading in his delivery. One would think that the loss of these accelerators would make it impossible to throw with MLB-quality velocity, but I can assure you that Pat has a very good fastball that is likely at or above the MLB average fastball velocity. I can't say much more until they make their media public, but hopefully that's enough to get you interested!

Anyway, I'll be adding Disabled List Informer to the blogroll and readers who are interested in the medical aspect of what I talk about should definitely check out his site.