Football tackleA study measuring the number and magnitude of head impacts occurring during a single season of high school football found: Athletes experienced a mean of 774 impacts during the 15-week season or approximately 50 impacts per athlete per week. Linemen sustained the highest number of impacts per athlete (1076 ± 541), followed by the tight end/running back/linebacker group (779 ± 286), the wide receiver/cornerback/safety group (417 ± 266), and quarterbacks. Games resulted in significantly more impacts than contact and noncontact practices and that contact practices yielded significantly more impacts than noncontact practices.

Source: American Journal of Sports Medicine December 2013