Rochester, NY -- New research at the University of Rochester shows minor brain injuries detected in players after a season of football don't fully heal in the off-season.

Dr. Jeffrey Bazarian says the finding could have long-term implications for the brain health of football players.

The players were scanned at the beginning of the season, at the end and after six months of rest.

The players did not suffer concussions -- and the injuries are not apparent to those around them. Dr. Bazarian says it's not clear yet if the effects are compounded by additional seasons of football.