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We developed a wearable device to improve lower limb sport training. The  presented system consists of a pair of spandex shorts which embed a processor  unit, 2 accelerometers and 2 vibro motors. The accelerometers are located in  proximity to the knees and measure tri-axial accelerations. We present a  novel method to compute and correct asymmetry of lower limbs during training.  The user performs an initial calibration phase which sets the accelerometer  reference frames. While running, the system continuously refines the  calibration using principal component analysis to take in account occasional  shorts assessments. The system activates a corrective vibro feedback on the  specific leg according to an asymmetry metric based on: (i) foot ground  impact, (ii) phase error between legs, (iii) transversal knee movements. User  tests demonstrated that the device is ergonomic to wear, easy to use and the  corrective vibro feedback is appreciated during the training.

Asymmetry measurement for vibroactive correction in lower limbs mobility