"A tiny accelerometer, gyroscope and magnetometer, along with a wireless chip and battery, are all packed into the device, which Dillon calls "Mamori" (Japanese for "protect"). The inertial sensors constantly monitor for movement and relay that information in real time to a laptop on the sidelines. If a player takes a hit, the force involved is immediately known, and if the impact falls above the threshold where a concussion is likely, medical care can be given instantly," courtesy of NBC News technology describes in some detail what specifically it measures.
It all stemmed from the ongoing injuries being suffered in Gaelic football. Despite the helmets, players were still continually sustaining head injuries.
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