Study: Children at risk of brain changes after 1 season of youth football

- While studies focusing on retired professional football players and those who reached collegiate level of play have reported on the damaging effects the sport can have on the brain, new research focusing on children has found that playing just a single season of youth football can put them at risk for measurable brain changes – even if they never received a clinical diagnosis of a concussion.

“Most investigators believe that concussions are bad for the brain, but what about the hundreds of head impacts during a season of football that don’t lead to a clinically diagnosed concussion?” lead study author Dr. Christopher T. Whitlow, an associate professor and chief of neuroradiology at Wake Forest School of Medicine in Winston-Salem, N.C., said in a news release. “We wanted to see if cumulative sub-concussive head impacts have any effects on the developing brain.”

For the study published online Monday in the journal Radiology, researchers focused on 25 male youth football players between the ages of 8 and 13 during a single season of play. They used Head Impact Telemetry System (HITs) to record head impact data and assess the frequency and severity of helmet impacts, according to the news release. None of the players involved in the study had shown signs or symptoms of a concussion throughout the season.

The study subjects were evaluated before and after the season with multimodal neuroimaging, including an advanced MRI technique to determine microstructural changes in the brain’s white matter. All games and practices were video recorded and reviewed to confirm the accuracy of impacts recorded with HITs. Researchers looked for changes in white matter and fractional anisotrophy (FA), which is the movement of water molecules in the brain and along axons. In healthy white matter, the direction of water movement is uniform and measures high in FA, according to the news release. Random water movement and decreased FA value has been associated with brain abnormalities.

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