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段落1

This is Scientific American 60-Second Mind, I'm Ingrid Wickelgren. Got a minute?

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Brain injury is a growing concern in football.

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But changes during practice could make the game safer for kids by cutting total blows to the head in half.

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So finds the largest study ever to measure head impacts in youth football.

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The work is in the Annals of Biomedical Engineering.

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Researchers put accelerometers in the helmets of 50 9- to 12-year-olds on three teams to detect forces on the head.

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For kids on two teams, practice was far riskier than games:

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they got more than twice as many whacks to the skull at practice than in games.

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The more hits, the greater the chance of brain injury.

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But the third team got knocked in the noggin only half as often as the others, and the difference was entirely from workouts.

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That team not only practiced less but their sessions were safer:

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players followed new Pop Warner rules that restrict the number of contact drills and outlaw the roughest ones.

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During actual games, however, contact was the same for all players,

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which shows that protecting kids in practice doesn't change the product on the field.

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That can stay as brutal as we like.

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Thanks for the minute, for Scientific American 60-Second Mind. I'm Ingrid Wickelgren.

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