Re: Understanding Pitcher Fatigue
First of all I agree with kal in that pitchers more than often are freaks of nature. How can a guy like Johnny Cueto throw the ball so fast when he is smallish is stature? When you get to the major leagues you are talking about a select few players who are supreme athletes in the first place. Then you just have God given gifts that pitchers have that ordinary people don't.
As in fatigue it is overall body fatigue. Pitchers run, they build up their leg strength, there really isn't much you can do to your arm in general to increase velocity and arm strength. I may be wrong but most of your arm strength comes from your joints, which is very difficult to strengthen. You also don't want to become too bulky in those areas because it may impede your delivery.
Most of the time I interpret fatigue to being tired or exhausted. It isn't necessarily your arm that is fatigued rather your entire body. You are zapped of energy and in order to make up from that you begin to press. You begin to try to make up for your energy by trying to throw harder. Most of the time when you do this your mechanics suffer. A starting pitcher will throw 80, 90, 100, 110 high effort pitches over the course of a start. That is a lot of energy used up there.