Under Armour's Sensor-Embedded Shirts Measure NFL Prospects
![](https://www.popsci.com/uploads/2019/03/18/RXWKKKXZ2OUCLCA7UZ7KGZHTI4.jpg?auto=webp)
Under Armour's E39 shirt looks mostly like a typical Under Armour compression shirt, which is to say, entirely unflattering on those of us who aren't professional athletes. But the E39 is actually a very different beast from the usual apparel, packing a triaxial accelerometer, a heart-rate monitor, and a breathing monitor. The days of simply clocking an NFL prospect's 20-yard sprint time are over--now coaches can see second-to-second updates on the player's internals, and even track the acceleration and deceleration of a player's individual strides.
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Concurrent Validity of the Armour39 Heart Rate Monitor Strap
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Under Armour's Sensor-Embedded Shirts Measure NFL Prospects, Stride by Stride
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Concurrent Validity of the Armour39 Heart Rate Monitor Strap
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Concurrent Validity of the Armour39 Heart Rate Monitor Strap