At least some of this will be stress. If you're enjoying something, then you won't be stressed. If you're feeling positive and delighting in what you do, then you won't be stressed in unhealthy ways. This looks similar to the Mozart Effect, which turned out to be that if you liked something, your brain functioned better.
Yes, charging around the stage playing rock music isn't exactly gentle, but it IS extremely good exercise for the heart and the rest of the body. Again, that's going to have positive effects.
(We can ignore Keith Richards in this model, as he's older than the universe and only created it as a place to store his guitars.)