WASHINGTON — For more than 20 years, Dr. Gerard Gioia has treated children with brain injuries. For the last seven, he’s focused his research on concussions in youth sports.

He’s noticed significant strides in that field lately — thanks, at least in part, to the focus on helmet hits and concussions in the NFL.

“What is amazing about this is how, over the last year, with the attention that’s been brought to the issue by the NFL, the whole field has just vaulted forward,” said Gioia, director of a concussion program at the Children’s National Medical Center. “In 2003, I had to convince families that this injury was something they needed to be concerned about. Now I have families coming to me, asking mostly the right questions and prepared to deal with the issue in ways so much ahead of where we were.”

Gioia was among the experts invited to speak at a “Youth Sports Safety Summit” hosted by the National Athletic Trainers’ Association on Capitol Hill Tuesday, a day before the NFL’s head, neck and spine committee meets in New York. Gioia and other experts agree there has been a trickle-down effect from the pros to youth sports, where progress is being made.

Last month, for example, Pop Warner — the nation’s oldest and largest youth football organization — announced it will require a note from a doctor before letting a player with a head injury return to action. Also in November, the American Academy of Neurology recommended that a qualified athletic trainer be present at all adult and children’s games and practices. And on Tuesday, New Jersey Gov. Chris Christie signed into law a bill that requires coaches to remove any player who shows signs of a concussion.

There is more work to be done, though, according to NATA. Gioia has been working to develop for teenagers and even younger children who might have a concussion the same sort of neurocognitive computerized testing tools that the NFL mandates for players.

“The NFL is the tip of the iceberg, and it shines an important light,” Gioia, an associate professor at the George Washington University School of Medicine, said in an interview. “But if you look at the volume of kids playing youth sports — not just football, but all youth sports — there’s 30 to 45 million kids playing, and they have the least-available sports medical knowledge and services.”

Dallas-based NATA, a professional membership association, is concerned about concussions among young athletes, as well as the risk of injury from heat illness, sudden cardiac arrest and sickle cell trait. NATA offers some striking statistics:

n More than 45 young athletes have died this year;

n About 8,000 children are treated in emergency rooms each day for sports-related injuries;

n Only 42 percent of high schools have access to athletic training services.

“Youth sports participants are almost the forgotten population,” NATA president Marjorie Albohm said. “We’ve neglected a large amount of young people over the past years, and now it’s time to change that.”