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• W616842669 abstract "Introduction: Functional electrical stimulation (FES) has been shown to be an effective approach to upperlimb stroke rehabilitation, where it assists patients' arm and shoulder movement. Model-based FES controllers have recently confirmed significant potential to improve accuracy of functional reaching tasks, but they typically require a reference trajectory to track. No upper limb FES control scheme has yet embedded a computational model of the task, however this is critical to ensure the controller reinforces the intended movement with high accuracy. This paper derives a computational motor control model of the task which can be embedded in FES control schemes, removing the need for a predefined reference trajectory. Methods: Kinematic data were collected using a Vicon motion capture system from unimpaired (N = 14) participants while they performed two functional reaching tasks in which they: 1) pushed a light switch, and 2) closed a drawer. In each case they starting and finished the movement with their hand on their knee. Dynamic models of each patient's arm were derived using estimated mass, inertial and stiffness parameters. Each task was posed as an optimization problem with position and velocity boundary constraints, and these were solved using iterative algorithms to yield computational models of movement. Results: For the case of unimpaired participants, the experimentally recorded joint angles were compared with those derived in simulation using the model, and were found to fit closely (mean fitting > 85%). Conclusion: Functional movements have been accurately modelled as constrained optimization problems involving dynamic models of unimpaired participants' arms. This extends previous computational models of human movement, and shows that they can be solved using iterative methods. Moreover, these methods are suitable to be employed experimentally in future stroke rehabilitation trials using FES to assist task completion in a manner corresponding to unimpaired movement. This hence ensures that assistance is aligned with voluntary intention, and in-so-doing maximizes the potential effectiveness of treatment." @default.
• W616842669 created "2016-06-24" @default.
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• W616842669 date "2013-03-14" @default.
• W616842669 modified "2023-09-27" @default.
• W616842669 title "Computational models of upper limb movement during functional reaching tasks for application in electrical stimulation based stroke rehabilitation" @default.
• W616842669 hasPublicationYear "2013" @default.
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