. >> reporter: brochard did that goes into the helmets changes. >> reporter: it's not just on the gridf concuusion in girl's -ootball. >> she took a major hit to her head in august and is still >> the headaches lingered and i %->> reporterr allisonfrom testifiee in front congress as lawmaaers investigate his growing ppobbem. high school athletes suffered an estimated 400,000 concussionss3 between 2005 and 2008. %rueename is traumatic brain >> reporter: theyywill require to train students teachers in concussion education. something, howard schools are already ushing. >> nobody wants to see a guyyget knocked down but we try to tell the kids whattthe differenne is. >> reporter: and try to protect the kids as much as possible. >> theee's preventtve measuues that you can take, headdto-head contact but during the game it'ú an issue of the sport. >> repoottr: and the violent hits get even worse ttrough high school, college and the nfl. %-school and collegiate athhete. the most profound impaat we can have on these athletes so to set an example. >> reporter: john called it qqits until doctors w