Accelerometric/encoder system and method to determine kinematic parameters during stationary holonomic exercise

摘要

A novel method and system to determine angular accelerations, angular velocities, and angular positions of the thigh and calf has been developed. Measurements are taken during stationary bicycle exercise. The approach considers only twodimensional motion (sagittal plain). The kinematic parameters are obtained based on acceleration measurements from two two-dimensional accelerometers fixed to each member (calf and thigh). The method is unique in that it does not perform integration toarrive to angular positions, thus avoiding buildup of errors associated with integration. Tests were performed using simulated data. An error analysis was performed. The system's expected maximum error is approximately 2° in the calf position for abicycling speed of one cycle per second.