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Brian Vastag

JAMA. 2002;287:437-439.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

"We just got one that's 11 meters per second."

"That's incredible."

"He got hurt. He was a punt returner, standing still as he got hit."

As two biokinetic engineers recount a video analysis of head-to-head football collisions, the dangers of the sport emerge.

"From my experience in auto safety, that's an incredible speed," said David Viano, PhD, a General Motors (GM) safety engineer who serves on a National Football League (NFL) committee studying concussions. In fact, 11 meters per second is a speed for cars, not people: 25 mph.

Engineers like Viano assess concussions with vectors and dummies. Physicians use neurological examinations, imaging studies, and cognitive tests. Players and coaches subscribe to a different code and use different language.

Sunday afternoon broadcasts offer a surfeit of circumlocution: getting "dinged," being "knocked around," "having your bell rung." Announcers report "mild concussions," never "traumatic brain injuries," even though that's what . . . [Full Text of this Article]

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