TIME continues to discuss the tragic risks of American Football in their latest issue. A new study from Wake Forest Baptist Medical Center in Winston-Salem, NC says high school football players display notable brain changes, even in the absence of a concussion.

The study monitored 24 high school football players between the ages of 16 and 18. Researches mounted sensors to their helmets to assess the frequency and severity of helmet impacts. While the players wearing the helmets were not concussed