Posted by breakdown5
I would say that MMA is more physically demanding than boxing, but boxing has proven to be more harmful in the long term IMO. MMA is still young and we really haven't seen a lot of guys totally destroyed by the sport, so its hard to tell.
I agree with this, MMA is definitely more physically demanding and you have to use a lot more widespread skill sets and a lot more muscles than in boxing. As far as the permanent damage goes, so far it seems that repeated hits to the head that don't knock you out cold, as in boxing, is worse for you. But it will be some time before we know for sure.