Only one other study has been published reporting impacts in rugby union[xxvii].  However this study utilised an instrumented mouthguard, not a wireless head impact sensor.  The mouthguard and the XPatch were from the same company (X2 Biosystems) and had the same accelerometer and gyroscope embedded into them. Comparisons for data from the current study are therefore limited to the instrumented mouthguard study in rugby and studies utilising helmet fitted accelerometers in youth ice hockey, youth, collegiate, and professional American football.