It was a hot August afternoon and football practice was just getting underway at Cherokee Trail High School in Aurora. Amid the gruff calls of assistant coaches and the smack of colliding shoulder pads came Coach Monte Thelen’s matter-of-fact voice at the end of each play, “Stay up, stay up, stay up!”

It was a half-pads “thud” practice and he wanted players to stay on their feet.

“We’re trying to limit the number of times players hit the ground with each other,” said Thelen. ”We didn’t do that 10 years ago. I’m not even certain we did that eight years ago.”

This kind of safeguard is just one of many measures that has been employed over the last several years to help prevent an invisible and potentially life-threatening injury: concussions. In the Cherry Creek school district, where Cherokee Trail is located, the issue resonates with particular intensity because it is where Jake Snakenberg, a Grandview High School freshman, was playing football in 2004 when he took a routine hit and died of “Second Impact Syndrome” the next day.

Read more at EdNews Colorado.