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托福听力练习-科学美国人60秒限制训练中的撞击

2017-03-02 10:25:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：限制训练中的撞击

　　科学美国人60秒中英文翻译：限制训练中的撞击

　　科学美国人60秒英文文本

　　Limit Youth Football Practice Hits for Brain Health

　　Brain injury is a growing concern in football. But changes during practice could make the game safer for kids by cutting total blows to the head in half. So finds the largest study ever to measure head impacts in youth football. The work is in the Annals of Biomedical Engineering.

　　Researchers put accelerometers in the helmets of 50 9- to 12-year-olds on three teams to detect forces on the head. For kids on two teams, practice was far riskier than games: they got more than twice as many whacks to the skull at practice than in games. The more hits, the greater the chance of brain injury.

　　But the third team got knocked in the noggin only half as often as the others—and the difference was entirely from workouts. That team not only practiced less but their sessions were safer: players followed new Pop Warner rules that restrict the number of contact drills and outlaw the roughest ones.

　　During actual games, however, contact was the same for all players—which shows that protecting kids in practice doesn’t change the product on the field. That can stay as brutal as we like.

　　中文翻译请点击下一页

本文关键字: 托福听力练习 科学美国人60秒

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