3-D motion analysis 1 Fourier transform 1 GMFCS level 1 IMU 1 Lie group 1 Technology: general issues 1 accelerometer 1 accelerometers 1 accelerometry 1 arm use 1 assistive device 1 assistive devices 1 body-worn sensors 1 center of pressure 1 cerebral palsy 1 circadian motor behavior 1 clinical 1 clinical setting constrained extended Kalman filter 1 constraint 1 distance measurement 1 embedded sensors 1 exercise 1 falls 1 functional linear model 1 gait 1 gait analysis 1 gait planning 1 gait rehabilitation 1 goniometer 1