A Myoelectric Computer Interface for Reducing Abnormal Muscle Activations after Spinal Cord Injury

Fabio Rizzoglio, F. Sciandra, Elisa Galofaro, L. Losio, E. Quinland, Clara Leoncini, A. Massone, F. Mussa-Ivaldi, M. Casadio
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引用次数: 1

Abstract

Myoelectric Computer Interfaces (MCIs) are a viable option to promote the recovery of movements following spinal cord injury (SCI), stroke, or other neurological disorders that impair motor functions. We developed and tested a MCI interface with the goal of reducing abnormal muscular activations due to compensatory strategies or undesired co-contraction after SCI. The interface mapped surface electromyographic signals (sEMG) into the movement of a cursor on a computer monitor. First, we aimed to reduce the co-activation of muscles pairs: the activation of two muscles controlled orthogonal directions of the cursor movements. Furthermore, to decrease the undesired concurrent activation of a third muscle, we modulated the visual feedback related to the position of the cursor on the screen based on the activation of this muscle. We tested the interface with six unimpaired and two SCI participants. Participants were able to decrease the activity of the targeted muscle when it was associated with the visual feedback of the cursor, but, interestingly, after training, its activity increased again. As for the SCI participants, one successfully decreased the co-activation of arm muscles, while the other successfully improved the selective activation of leg muscles. This is a first proof of concept that people with SCI can acquire, through the proposed MCI, a greater awareness of their muscular activity, reducing abnormal muscle simultaneous activations.
减少脊髓损伤后异常肌肉激活的肌电计算机接口
肌电计算机接口(MCIs)是促进脊髓损伤(SCI)、中风或其他损害运动功能的神经系统疾病后运动恢复的可行选择。我们开发并测试了MCI接口,目的是减少由于脊髓损伤后代偿策略或不希望的共同收缩而导致的异常肌肉激活。该界面将表面肌电图信号(sEMG)映射为计算机显示器上光标的运动。首先,我们的目标是减少肌肉对的共同激活:两个肌肉的激活控制光标运动的正交方向。此外,为了减少第三块肌肉的同时激活,我们根据这块肌肉的激活来调节与屏幕上光标位置相关的视觉反馈。我们用6名未受损的参与者和2名脊髓损伤参与者测试了这个界面。当目标肌肉与光标的视觉反馈相关联时,参与者能够减少目标肌肉的活动,但有趣的是,训练后,其活动再次增加。对于SCI参与者,一个成功地减少了手臂肌肉的共同激活,而另一个成功地改善了腿部肌肉的选择性激活。这是首次证明SCI患者可以通过拟议的MCI获得对其肌肉活动的更大意识,减少异常肌肉同时激活的概念。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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