Here is a response from Dr. Glen Fleisig in regard to curveballs from the ASMI website:
Glenn Fleisig, Ph.D.
ASMI Team
member is offline
Joined: May 2005
Gender: Male
Posts: 579
Location: Birmingham, AL
Re: curveball
« Reply #49 Yesterday at 12:01pm »
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Good, lively discussion, guys. It clearly shows your collective passion for helping kids enjoy baseball - in a successful and safe manner. I share this passion.
Let me try to add some clarification:
First of all, I think each of you should get and read this article, if you haven't done so already. Click on right, where it says, "Full Text (PDF) Free".
This study, as well as previous studies, shows that lateral trunk tilt at the time of ball release was about the same for kids throwig fastballs and curveballs - about 29 +/- 8 degrees. What this means is that most (about two thirds) youth pitchers have their trunk tilted to their glove side, somewhere between 21 and 37 degrees. Furthermore, shoulder "abduction" (essentially, the armpit angle) is between 80 and 95 degrees for both the fastball and curveball, for most youth pitchers. An "over the top" pitcher might be closer to 37 deg of lat. trunk tilt and 95 deg of abduction, while a pitcher with a low arm slot might be closer to 21 deg of lat. trunk tilt and 80 deg of abduction. What all of this means is that variation in release angle of the ball is a lot bigger between pitchers than between pitch types within one pitcher.
The above study included 29 youth pitchers (10-15 years old). They each claimed to throw a fastball and curveball. No instructions were given how to throw a curveball. We used this procedure because we wanted to test typical, self-proclaimed youth curveballs in our society - not particular curveball mechanics taught by ASMI nor by any other individual center.
Although ASMI has tried to prove that the curveball is more dangerous than the fastball for youth pitchers, we have not been able to prove this. My personal opinion is that we will never prove the curveball to be more dangerous than the fastball. That being said, I think we all agree that the youngest pitchers should get their fastball going first ("master it", "dominate", whatever term you want to use).
Here is a link to the page in the message board:
http://asmiforum.proboards21.com/index.cgi?action=displ...th&thread=569&page=4