Knee Exoskeleton Reduces Muscle Effort and Improves Balance During Sit-to-Stand Transitions After Stroke: A Case Study
Knee Exoskeleton Reduces Muscle Effort and Improves Balance During Sit-to-Stand Transitions After Stroke: A Case Study
复制标题
DOI：
10.1109/icorr55369.2022.9896571
复制
发表时间：
2022-07
期刊：
影响因子：
--
通讯作者：
Sergei V. Sarkisian;Andrew J. Gunnell;K. Foreman;T. Lenzi
中科院分区：
文献类型：
--
作者：
Sergei V. Sarkisian;Andrew J. Gunnell;K. Foreman;T. Lenzi
中风后，负重不对称经常迫使中风幸存者通过过度使用未受影响的一侧肌肉来站立进行补偿。电动外骨骼可以通过在坐立转换过程中帮助受影响的肢体来解决这个问题。然而，目前没有实验证据表明这种干预对目标人群的效果。这项研究探索利用肌电信号控制动力膝关节外骨骼，以帮助中风患者在坐-立转换过程中。我们的结果显示，当佩戴外骨骼时，健侧和患侧的峰值膝关节扭矩分别降低了6.24%和11.9%。此外，佩戴外骨骼时，患侧股内侧和股外侧肌的肌电信号峰值分别下降了29.3%和21.9%，积分肌电信号值分别下降了46.7%和36.1%。最后，我们的结果表明，根据不对称度(DOA)、压力中心(COP)和重心(COM)，内侧向平衡分别改善了61.2%、81.6%和70.0%。这些结果支持了使用动力外骨骼进行高扭矩任务的有效性，例如中风幸存者的坐立转换。
After a stroke, the weight-bearing asymmetry often forces stroke survivors to compensate with overuse of the unaffected side muscles to stand up. Powered exoskeletons can address this problem by assisting the affected limb during sit-tostand transitions. However, there is currently no experimental evidence demonstrating the efficacy of this intervention with the target population. This study explores controlling a powered knee exoskeleton with EMG signals to assist a stroke patient during sit-to-stand transitions. Our results show decreased peak knee torques by 6.24% and 11.9% on their unaffected and affected sides, respectively, while wearing the exoskeleton. Additionally, the peak value of the EMG signal decreased by 29.3% and 21.9%, and the integrated EMG signal value decreased by 46.7% and 36.1% on their affected vastus medialis and lateralis while wearing the exoskeleton, respectively. Finally, our results indicate improved medial-lateral balance by 61.2%, 81.6%, and 70.0% based on the degree of asymmetry (DOA), the center of pressure (COP), and the center of mass (COM), respectively. These results support the efficacy of using powered exoskeletons for high-torque tasks such as sit-to-stand transitions with stroke survivors.