New research reports that 15 of 54 student athletes who seemed to have bounced back from a concussion saw a decline in memory skills after they exercised moderately — suggesting that their brains had not yet healed. Doing too much too early could delay recovery, concussion specialists say — draining needed energy away from healing. William P. Meehan, HMS assistant professor of pediatrics and Alex McLean Taylor, HMS instructor in psychology in the Department of Psychiatry, both of Boston Children’s Hospital, are quoted.

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