Bobblehead, I am no Doctor (I wish!) but I can only speak from a Dad who in hindsight can speculate what causes it. I'm sure WebMD, etc. can probably give a better explanation. In high school weightlifting rooms, most all athletes do workouts to build the bigger muscle sets which is essential for overall strength. This is good for football players (mostly) but not limited to. All athletes benefit from overall strength. But throw into the mix athletes who "specialize" in certain sports, i.e. pitchers, catchers, javelin throws, tennis players, etc. that utilize their arms. It has just recently in the past few years become known that these specialty athletes do not need to lift weights like a fullback or wrestler. Sports Orthopedics are advising these athletes to not be lifting weights past parallel of their shoulders at all, i.e. shoulder presses, bench presses, pulldowns, etc.
Building the large muscles is great, but what is being neglected are all the hundreds of smaller muscles surrounding them. They need strengthening as well. High School football or some strength coaches don't know how to accomplish this. Some can't because the head football coach only wants strength so all athletes are thrown into the proverbial pot to lift how the football team is.
Icing and running is part of the process of proper maintenance, but only a small part.
Again, this is only my opnion.