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The Boston Globe

Metro

Student athletes return too soon after concussions

Some student athletes who suffered a head injury are at risk of return­ing to the field or rink before their brain is fully healed, according to a new study on a concussion test used by more than 300 schools in Massachusetts.

The study, slated for publication in January’s issue of the journal Brain Injury , found that 28 percent of the athletes who initially seemed to have regained their cognitive abilities, particularly memory, saw a dip after moderate exertion.

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