Women's soccer has very high rates of concussions especially relative to male soccer, the theory being that women have weaker neck muscles and that the rapid movement of the head makes them more susceptible to being concussed. I have read some studies which actually point to soccer as being a high risk due to the collisions that occur at high speed as well as the micro-traumatic events such as heading the ball, which on their own are not going to cause a serious concussion but when taken as an accumulation of the events have the same impact as concussions. Many of the same things happen with skeleton and luge racers if memory serves me correct, as when they go down the track on the sled the jarring motions cause their brains to make contact with their skulls.
We really still know very, very little about concussions and why there are some people who are more prominently impacted.
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