System determines impact of a helmet, comprising: accelerometer and processor, the accelerometer detecting acceleration of the helmet, the processor configured to process the signals from the accelerometer to determine impact of the helmet. System determines athletic performance, comprising: pressure...http://www.google.es/patents/US7162392?utm_source=gb-gplus-sharePatente US7162392 - Sport performance systems for measuring athletic performance, and associated methods
Sport performance systems for measuring athletic performance, and associated ...
