Reported concussions in the NFL rose 58 percent in regular-season games to the highest number in any of the past four years. The league issued its concussion data for 2015, a little more than a week before the Super Bowl, and it showed that helmet-to-helmet hits were also way up. Jeff Miller, the NFL's senior vice president of health and safety policy, said during a conference call the league will study what might have caused the incidence of head injuries to rise so much this season.

 

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Concussions Increase by 58% in NFL - 2015