Narrator: This is Science Today. It's been found that college and high school football players, who have suffered from one concussion, are three times more likely to suffer from another, compared to players who have never experienced head trauma. Dr. Martin Holland, a professor of neurosurgery at the University of California, San Francisco says previous studies found more than half of high school football players returned to the game the same day as a loss of consciousness.
Holland: We have to educate trainers, educate coaches, educate parents and educate the players themselves in terms of somebody should realize, "look, I've just got my bell rung, I'm gonna stay out of the next couple of games."
Narrator:The new study was conducted by researchers at the University of North Carolina at Chapel Hill and Holland says it confirms previous theories that one concussion increases the chances of getting a second one, which can lead to second impact syndrome.
Holland: The recovery after the second injury is longer. That's one of the reasons why we don't want to let athletes go back too soon, because this is well established, especially in the younger populations.
Narrator: For Science Today, I'm Larissa Branin.