From the National Football League’s website:

Advancing a culture wherein the health and safety of players is paramount requires much more than just a set of game rules.

It requires ongoing education, dialogue and monitoring. It requires constant assessment and consistent reinforcement of policies. And it requires an unstinting commitment to everyone involved in the game – players, coaches, administration, medical staff sand the NFL Players Association.

The combination of these efforts, in conjunction with league-wide rule changes and safety equipment updates, have measurably improved player health and safety.

There is perhaps no better recent illustration of the league’s commitment to health and safety than in the area of concussions. The NFL has taken considerable steps to reduce both the occurrence and health In 2011, the league continued these efforts by updating rules and enforcement policies meant to reduce head injuries, and by educating players about what to do if they experience concussion-related symptoms through educational videos, and a fact sheet and poster distributed to all teams, and presentations from the officiating department.

The league also added further enhancements to its in-game concussion-related policies, instituting a new tool for sideline concussion evaluations, and more.

The NFL also continued to promote safe play at all levels of football, working closely with the Centers for Disease Control and Prevention, USA Football and other leading organizations to educate young athletes, their parents and coaches about the importance of head injury awareness.