Not to discount the study, but my son has had three concussions on the soccer field, and he wasn't heading the ball on any of them. (If you must know: Falling Courver goal to the head, collision with his own keeper's shoulder, and ball accidentally kicked across the field off the back of his head while he got a drink of water on the sideline during practice.)
Did heading the ball at other times make him more susceptible to concussions? I don't know, but I think all three blows would have caused a head injury for almost anyone.
If a soccer player makes it all the way through high school without a concussion, he or she is either lucky ... or hasn't been properly diagnosed.
