Someone posted a study that appears to contradict what I said and I can't find where I read it, so may have to say I was incorrect there. It feels almost like boxing in that dehydration was a major factor in the likelihood of concussion, compounding the actual hits to the head. I can certainly believe that repeatedly having your head rattled about cannot be good. English prem players who also play internationally have the most hours of any players in the world and by a fair distance at times. This must be having a big impact, especially when you have a coach like Jones who uses the short time with England to absolutely beast them. It cannot be doing their bodies any good. We really need rules on maximum game time to be tightened up. I don't think any other contact sport has as many hours played per year as rugby.