I think those are poor directions for self defense training as they miss the issues of multiple opponents, weapons, and terrain... BUT, useful self defense training requires working against a resisting opponent at some point. That may mean mostly drills and conditioning with a high contact sparring session once in a while.

However, notice that your question isn't about high contact sports, or sparring, but you've mentioned martial arts in general. So... it's not well framed for anything you're talking about here.

I mention martial arts in general because I am equally interested in hearing about injury rates in Aikido, taichi and the like. I am proposing a kind of measure of self defence where you look at both injury caused by martial arts and those prevented by martial arts.