When it comes to brain injuries, doctors say the off season may not be enough time for a football player's brain to recover.
A small study out of the University of Rochester looked the brains of ten football players before and after the season, and again after six months of rest.
None of the players were diagnosed with a concussion, however they did experience hits to the head.
Researchers found the athletes had more changes in the white matter of the brain after the football season, and those changes were still there six months later.
That's indicates a need for more rest.