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The Development of a Portable Motion Analysis System Using FES Motion Sensors

The use of accelerometers to measure human motion has been suggested for over 30 years (Smidt et al, 1971). With recent advances in miniaturization and the integration of rate gyroscopes, portable motion sensors are becoming a viable alternative to optical motion analysis systems (Mayagoitia et al, 2002). The development and refinement of accelerometer based motion sensors were largely driven by the needs of FES designers who needed real-time information about limb position for precise FES control. It was important that such sensors be ultra light, unobtrusive, and reliable (Williamson & Andrews, 2000; Simcox, et al, 2001).