TAMPA -- It's another hot and humid August morning of preseason practice for the USF Bulls football team. With the sun beating down on the field, the temperature is already 90 degrees Fahrenheit at 9 a.m., and the “feels like” temperature is a sweltering 105 degrees.

Sweat pours off the players wearing heavy pads and helmets as they run, tackle, jump, throw and catch, eager to start a new season of Big East football. On the sidelines, Dr. Eric Coris and the team's athletic trainers move quickly among some players who have briefly left the field, touching a small data recorder to their lower backs or abdomens. The device reads the internal temperature of players who swallowed a silicone-coated pill the night before. The pill, an ingestible thermometer the size of a large multivitamin, transmits low-frequency magnetic signals from deep within the gut to the data recorder held outside the body.

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