ROCHESTER, N.Y., Nov. 21 (UPI) -- A routine hit to the head during a high school football or hockey game may result in subtle injury even if there is no concussion, U.S. researchers say.
Lead author Dr. Jeffrey Bazarian, associate professor of Emergency Medicine at the University of Rochester Medical Center, said the study involved a small sample of athletes -- nine athletes and six people in a control group -- but it raises powerful questions about the consequences of the mildest head injury among youths with developing brains.