Inertial measurements of upper limb motion
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We present an inertial sensor based monitoring system for measuring upper limb movements in real time. The purpose of this study is to develop a motion tracking device that can be integrated within a home-based rehabilitation system for stroke patients. Human upper limbs are represented by a kinematic chain in which there are four joint variables to be considered: three for the shoulder joint and one for the elbow joint. Kinematic models are built to estimate upper limb motion in 3-D, based on the inertial measurements of the wrist motion. An efficient simulated annealing optimisation method is proposed to reduce errors in estimates. Experimental results demonstrate the proposed system has less than 5% errors in most motion manners, compared to a standard motion tracker.
KeywordsInertial measurement Stroke rehabilitation Motion tracking Upper limb Simulated annealing
The authors would like to thank the Charnwood Dynamics Ltd that kindly provided the CODA CX1 for the evaluation. The Xsens Dynamics Technologies and the other members of EPSRC EQUAL SMART Rehabilitation Consortium are also acknowledged for valuable discussion.
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