Effects of Assisted Dorsiflexion Timing on Voluntary Efforts and Compensatory Movements: A Feasibility Study in Healthy Participants
Effects of Assisted Dorsiflexion Timing on Voluntary Efforts and Compensatory Movements: A Feasibility Study in Healthy Participants
复制标题
辅助背屈时间对自愿努力和代偿运动的影响：健康参与者的可行性研究
DOI：
10.1109/tnsre.2021.3119873
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发表时间：
2021
影响因子：
4.9
通讯作者：
H. Iwata
中科院分区：
文献类型：
--
作者：
Jing;Hao Cheng;Kazuhiro Yasuda;Hiroki Ohashi;H. Iwata
在以前的研究中，我们发现，调节背屈的辅助时间可能会影响用户的自愿努力。这可以构成一个基于辅助战略的重点领域，可以制定这些战略，以促进患者的自愿努力。在本研究中，我们进行了实验，以验证在不同的时间使用高背屈辅助系统的踝关节背屈辅助的效果。9名健康的年轻参与者佩戴了一个限制背屈的装置，使他们能够使用环绕或踏步步态。基于步态从站立到摆动阶段的过渡，将高背屈辅助系统的辅助定时设置为具有延迟，延迟范围为0到300 ms。9名参与者中有8名的指数结果评估了补偿运动，并显示与辅助延迟时间的正的强/中等相关性（r = 0.627-0.965，p <0.001），而其他参与者在背屈辅助时间较晚时也进行了代偿运动。与此同时，9名参与者中有6名的胫骨前表面肌电图结果显示，与背屈辅助延迟时间呈强/中度正相关（r = 0.598-0.922，p <.001），这表明调整辅助时机确实促进了这些参与者的自主背屈运动。这一结果表明，应该有一个权衡之间，确保自愿背屈运动和防止不正确的步态模式在不同的援助时间。这项可行性研究的结果表明，开发一种自适应控制方法，以确保自愿的努力，在机器人辅助步态康复的基础上援助定时修改的潜力。还需要一种新的援助机制，以刺激和激励患者的自愿努力，并应加强积极的步态康复的效果。
In previous research, we found that modulating the assistance timing of dorsiflexion may affect a user’s voluntary efforts. This could constitute a focus area based on assistive strategies that could be developed to foster patients’ voluntary efforts. In this present study, we conducted an experiment to verify the effects of ankle dorsiflexion assistance under different timings using a high-dorsiflexion assistive system. Nine healthy and young participants wore a dorsiflexion-restrictive device that enabled them to use circumduction or steppage gaits. On the basis of the transition from the stance to the swing phase of the gait, the assistance timings of the high-dorsiflexion assistive system were set to have delays, which ranged from 0 to 300 ms. The index results from eight out of nine participants evaluated compensatory movements and revealed positive strong/moderate correlations with assistance delay times (r = 0.627–0.965, p <.001), whereas the other participants also performed compensatory movement when dorsiflexion assistance timing was late. Meanwhile, the results from tibialis anterior surface electromyography from six out of nine participants showed positive strong/moderate correlations with dorsiflexion assistance delay times (r = 0.598–0.922, p <.001), indicating that tuning the assistance timing did foster these participants’ voluntary dorsiflexion movements. This result indicates that there should be a trade-off between ensuring voluntary dorsiflexion movements and preventing incorrect gait patterns at different assistance timings. The findings of this feasibility study indicate the potential of developing an adaptive control method to ensure voluntary efforts during robot-assisted gait rehabilitation based on assistance timing modification. A new assistance mechanism should also be required to stimulate and motivate a patient’s voluntary efforts and should reinforce the effects of active gait rehabilitation.