quote:
Originally posted by handyrandy:
And here is one for you..AMSI tested and compared the forces and exerted on the shoulder and elbow between throwing a football and a baseball. They found that, for a variety of reasons(mainly the size of the ball, length of the motion, etc) the forces exerted on a QB's arm were significantly less than those on a pitcher's arm.
Thanks for the reply pointing to the study. I had seen this b4 but forgot about it. I reread the study several times and I don't interpret the info the same as you. ASMI performed the study to evaluate cross-training of baseball and football for pitchers and QBs.
ASMI *never* says that "...forces exerted on a QB's arm were significantly less than those on a pitcher's arm." They do say that pitcher's create "greater rotational velocities of the arm and trunk." They go on to say QBs compensate for this by "rotating the shoulders sooner."
Going into the study, the hypothesis was that QBs could increase velocity by cross-training with pitching. This suggests they expected from the outset that pitchers generate greater velocity.
One could interpret that greater velocities imply greater forces but given that they also say pitchers have greater "internal shoulder rotation" the velocity gain makes sense and shouldn't be interpreted as creating undue force on the shoulder.
On the other hand, ASMI says that QBs compensate for the heavier ball with "greater elbow flexiion and shoulder horizontal adduction", i.e "leading with the elbow", which could be interpreted as the QB having greater force on the elbow than the pitcher.
Here's the link to the study for others:
http://www.asmi.org/asmiweb/research/usedarticles/baseballvsfootball.htmReread the study and see if you disagree with my comments. The study generally is about comparing the mechanics of baseball and football highlighting the differences. There is *no* smoking gun result that says the force on a QB's arm is significantly less than a pitcher.
Some thoughts on why QBs don't have the arm problems of pitchers:
- QBs throw less than pitchers
- QBs don't throw different pitches
- QBs don't always fully exert themselves when throwing (screen passes, etc.)
My son doesn't play football but we do throw the football a lot during the baseball offseason for cross-training and at times for warmups. I picked this up after Nolan Ryan began doing it when with the Rangers. Works great for my oldest (16yr) but my younger son (11yr) has more problems with the mechanical differences.