What nobody knew at the time is that these small collisions may be just as damaging. The growing body of research on former football players suggests that brain damage isn't necessarily the result of any one trauma, but the accumulation of thousands of seemingly innocuous blows to the head.
Compared to footie/rugby:
there may be a greater prevalence of head injuries in the American game because the players hit each other with forces up to 100% greater. "If they didn't have helmets on, they wouldn't do that," he says. "They know they'd injure themselves."
Dhani Jones, a linebacker for the Cincinnati Bengals who has played rugby, too, says head injuries in that sport do happen, but they're mostly freak accidents. "In football, you're taught to hit with your face," he says. "You're always contacting with your 'hat,' which is your head."
But like most issues that involve a compromise, people will continue to look to technology for the answer, even if it creates a new set of problems.
"The NFL is currently conducting independent testing of helmets with a focus on "more accurate and comparative information about concussive forces," says neurologist Ira Casson, a co-chair of the NFL's Mild Traumatic Brain Injury Committee."
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