dr mark rogers, a team physician for the hoekies is giving a follow up exam. >> eight to 10-year-oldsre getting a lot of hits, some pretty good g-force. some of the hits are up to 100 gs. >> it's dangerous. >> it's high. a lot of stuff generates changes. they are not doing a lot of head to head contacts or hitting drills during the week. the fact that he may have had a concussion - does to give you reservations about football. >> when your children get injured it makes you think. as long as you have programs like this, where people are trying to help and making sure the kids stay as safe as approximately. i wouldn't hesitate putting the kids out there if he wants to play. that would be his decision. >> professor dumis is trying to make the game safer. create safer helmets. >> front, side, back, top impacts. for every test we multiply that by how many times the players sees that in a year. everything comes together, giving you a star rating. the helmets absorb energy better, lower acceleration, lowering risk. >> you have what looks like a helmet canon. what is this modelling different