An Associated Press survey of 100 NFL players finds that fewer than half think the league's clubs, coaches and team doctors have the athletes' best interests at heart when it comes to health and safety.

The divide between older and younger players is striking.

Barely a third of the players with at least four years of experience, 35 percent, tell the AP they trust that their interests are being protected. That is far lower than the 71 percent of players in Years 1-3 who hold that positive outlook.

The survey of players from all 32 teams, released Sunday, also shows that 71 of the 100 participants say they have noticed other players' play affected by what might be health concerns. More than a third acknowledge their own play has been influenced.