BACKGROUND Arm weight compensation with rehabilitation robots for stroke patients has been successfully used to increase the active range of motion and reduce the effects of pathological muscle synergies. However, the differences in structure, performance, and control algorithms among the existing robotic platforms make it hard to effectively assess and compare human arm weight relief. In this paper, we introduce criteria for ideal arm weight compensation, and furthermore, we propose and analyze three distinct arm weight compensation methods (Average, Full, Equilibrium) in the arm rehabilitation exoskeleton 'ARMin'. The effect of the best performing method was validated in chronic stroke subjects to increase the active range of motion in three dimensional space. METHODS All three methods are based on arm models that are generalizable for use in different robotic devices and allow individualized adaptation to the subject by model parameters. The first method Average uses anthropometric tables to determine subject-specific parameters. The parameters for the second method Full are estimated based on force sensor data in predefined resting poses. The third method Equilibrium estimates parameters by optimizing an equilibrium of force/torque equations in a predefined resting pose. The parameters for all three methods were first determined and optimized for temporal and spatial estimation sensitivity. Then, the three methods were compared in a randomized single-center study with respect to the remaining electromyography (EMG) activity of 31 healthy participants who performed five arm poses covering the full range of motion with the exoskeleton robot. The best method was chosen for feasibility tests with three stroke patients. In detail, the influence of arm weight compensation on the three dimensional workspace was assessed by measuring of the horizontal workspace at three different height levels in stroke patients. RESULTS All three arm weight compensation methods reduced the mean EMG activity of healthy subjects to ...
Human arm weight compensation in rehabilitation robotics: efficacy of three distinct methods
2020-02-05
Just, Fabian; Özen, Özhan; Tortora, Stefano; Klamroth-Marganska, Verena; Riener, Robert; Rauter, Georg (2020). Human arm weight compensation in rehabilitation robotics: efficacy of three distinct methods. Journal of Neuroengineering and Rehabilitation (JNER), 17(1):13.
Article (Journal)
Electronic Resource
English
DDC: | 629 |
Human arm weight compensation in rehabilitation robotics: efficacy of three distinct methods
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