
So much inflammation. Root causes are a lack of conditioning, poor recovery techniques after engaging in stressful activity like pitching, and not the best of diets.
Speaking of inflammation, Verlander is more than likely extremely out of shape, and in his rehab, they should add some serious jogging to help build up his overall endurance; not just for pitching. Otherwise, he may never pitch again except perhaps in occasional relief. As for his actual pitching, I would wager that the spin rates on his pitches are also down too much, and hence batters teeing off as they have in simulated games. If this is the case, then regardless of all rehab efforts, his body may simply be deteriorating a lot like Miggy's did toward the end, and in V's case, it's significantly reducing his pitching effectiveness, also turning him into a shell of his former self. In addition to what I mentioned above, Verlander's diet needs to be changed dramatically to help increase energy if he is ever to get at least marginally productive to finish his career while playing and contributing as a player.
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