Fleming Aaron, Huang He Helen
IEEE Int Conf Rehabil Robot. 2019 Jun;2019:899-904. doi: 10.1109/ICORR.2019.8779509.
In this study we aimed to investigate the potential for antagonistic residual muscles to generate anticipatory and compensatory postural adjustments and their benefit to postural control with proportional myoelectric control of a powered ankle prosthesis. We conducted this investigation using a predictable pendulum drop task with a single transtibial amputee. In two individual testing sessions the participant used his prescribed passive device and a powered device with pneumatic artificial muscles actuated proportionally to the activation of residual Tibialis Anterior (TA) and Lateral Gastrocnemius (GAS) muscles. Results demonstrated the transtibial amputee generated activations from the residual TA significantly earlier in the powered condition $(p=\theta.\theta\theta 7)$. In the powered condition anticipatory center of pressure excursions were significantly higher $(p=\theta.\theta 17)$, and peak center of mass excursions were reduced $(p=\theta.\theta 21)$. Peak medio-lateral center of pressure excursions were also significantly less in the direction of the intact limb for the powered condition $(p\ =\ \theta.\theta\theta 3)$. The results from this pilot study demonstrate the promise for transtibial amputees to generate anticipatory postural adjustments as well as the potential improvement of stability under expected perturbations. This pilot study provides an initial basis for future study using proportional myoelectric control via antagonistic residual muscles for the control of posture under expected perturbations.
在本研究中，我们旨在探讨拮抗残余肌肉产生预期和补偿性姿势调整的潜力，以及通过动力踝关节假肢的比例肌电控制对姿势控制的益处。我们使用可预测的摆锤下落任务对一名经胫截肢者进行了此项研究。在两个单独的测试环节中，参与者使用其规定的被动装置和一种动力装置，该动力装置的气动人工肌肉与残余胫骨前肌（TA）和外侧腓肠肌（GAS）的激活成比例地驱动。结果表明，在动力条件下，经胫截肢者残余TA的激活明显更早（p = 0.007）。在动力条件下，预期压力中心偏移显著更高（p = 0.017），质心峰值偏移减小（p = 0.021）。在动力条件下，完整肢体方向的内侧-外侧压力中心峰值偏移在动力条件下也显著更小（p = 0.003）。这项初步研究的结果表明，经胫截肢者有产生预期姿势调整的前景，以及在预期扰动下稳定性的潜在改善。这项初步研究为未来通过拮抗残余肌肉使用比例肌电控制在预期扰动下控制姿势的研究提供了初步基础。
