This year, new research is giving him a closer look. Coris said he's using a lot of different equipment.

"A lot of different technology to look at what a football player of a different position actually exerts during a practice," he said.

One piece of technology helping him track metabolic demand is a vest, with a built-in GPS system.

"It measures your movement, your activity, your acceleration during a football practice," Coris said. "So we can actually kind of measure your workload."

The technology gives researchers a closer look at the workload of a variety of players.

"Obviously if you're a defensive back, your motion, your activity, your movement, your acceleration is a lot different than it might be if you're playing on the offensive line," Coris said. "So we want to try to quantify that and we want to know how that relates back to core temperature, so we can try to predict who's going to get into trouble."

A mask with a portable device strapped to a player's back is also helping make that prediction. It allows researchers to determine how quickly a player is using oxygen.

Coris said these devices haven't really been used in this setting and he's excited to be part of the research.

He hopes matching different pieces of technology will help answer the underlying question of how to prevent athletes from dying on the field from heat stroke.

Coris hopes to have some answers within the next few months.