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NancyLebovitz comments on Rationalist Sport - Less Wrong Discussion
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Big wodge of evidence about karate in particular (not martial arts in general) being unhealthy.
A lot of it is about karate masters-- it's quite possible that if you stop when karate starts seeming like it's bad for you, it's not all that destructive.
I've poked around a little to see whether belly-dancing and tap-dancing (complex movement of very different kinds) increase longevity, but haven't turned up anything.
This probably wouldn't be an issue for karate, but a lot of high-level judo and jujitsu people in the last century died of stroke because blood chokes ( a major part of jujitsu technique) put unusual loads on the cardiovascular system. The modern consensus is not to practice them on people over forty-five or so, or with existing cardio issues.
Fascinating, thank you for this!
You're welcome. I keep hoping someone with more knowledge of statistics than I've got will take a look at the karate study.