Updated: 05/28/2014 7:33 AM
Created: 05/27/2014 6:38 PM KSTP.com
By: Todd Wilson
In the past few years, we've seen concussions become a big topic in high school sports -- specifically football.
The Centers for Disease Control estimates that 1.6 million to 3.8 million concussions occur each year.
Football is the most common sport with concussion risk for males, with a 75 percent chance for concussion. Edina High School Head Football Coach Reed Boltmann says concussions have changed the way the game is practiced and played.
"We're not doing as much full contact, hitting in practice, a little more thud stuff more walk through," he said.
Boltmann says they had eight concussions last season, out of 170 players in grades 9-12.
Harvard researchers found children who suffered a second concussion within a year of their first had symptoms that lasted nearly three times longer. The number of previous concussions also affected recovery time.
When it comes to football, proper tackling technique is key.
"I think that's eliminated some of those concussions," Boltmann said.