Think sports fans need a few more stats to stress over while pick their fantasy teams?  How about lung capacity or peak heart rate?  Under Armour and Zephyr Technology have teamed up to create sensor-equipped compression shirt that measures an athlete’s performance, including heart rate, metabolism, body position, and lung capacity.  While there are many practical uses for the technology of the E39 shirt, like customized work-outs and warning signs for injuries, we expect to see some health stats on the big screen at games.  Click ahead to learn more about the technology.