A two-year study of high school football players suggests that concussions are likely caused by many hits over time and not from a single blow to the head, as commonly believed. Purdue University researchers have studied football players for two seasons at Jefferson High School in Lafayette, Ind., where 21 players completed the study the first season and 24 the second season, including 16 repeating players. Helmet-sensor impact data from each player were compared with brain-imaging scans and cognitive tests performed before, during and after each season...
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