I have refereed many levels of hockey for 35 years, most concussions are caused by collisions during play.
Actually at the pro level there is much more physical contact (bodychecking) than there used to be, the players are in much better condition (faster), the equipment offers way more protection and shifts are shorter thus more high speed collisions.
Most if not all hockey helmets offer very little protection to the brain, a clean hit can cause a concussion just as an elbow to the head can.
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