Effects of an ankle-foot orthosis with oil damper on muscle activity in adults after stroke
Effects of an ankle-foot orthosis with oil damper on muscle activity in adults after stroke
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DOI：
10.1016/j.gaitpost.2010.10.083
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发表时间：
2011-01-01
期刊：
影响因子：
2.4
通讯作者：
Ichihashi, Noriaki
中科院分区：
文献类型：
--
作者：
Ohata, Koji;Yasui, Tadashi;Ichihashi, Noriaki
背景和目的：研制了一种油阻尼式踝足矫形器（AFO-OD），以抵抗跖屈运动，从而改善偏瘫步态。本研究的目的是确定AFO-OD对中风患者步态周期中肌肉活动的影响。研究方法：在11名卒中幸存者和11名年龄匹配的健康成人中，使用肌电图（EMG）评估在患侧佩戴AFO-OD或带跖屈止动器（AFO-PS）的AFO时以自选速度的步态。从胫骨前肌（TA）、腓肠肌（GAS）和比目鱼肌（SOL）获得EMG信号。此外，还监测了两种支具下的踝关节角度和AFO-OD下的跖屈阻力矩（PFRT）。结果：两组在AFO-OD下的PFRT峰值均出现在负荷反应相（LRP）。AFO-OD在卒中组LRP期间促进了充分的跖屈，而AFO-PS则没有。与AFO-PS相比，AFO-OD组LRP时GAS EMG波幅显著降低，且与LRP时PFRT峰值显著相关。结论：AFO-OD辅助LRP过程中的“足跟摇杆功能”，降低GAS肌肌电图振幅。(C)2010 Elsevier B. V.保留所有权利。
Background and objective: An ankle-foot orthosis with an oil damper (AFO-OD) was developed to resist plantarflexion motion, thereby improving hemiplegic gait performance. The purpose of this study was to determine the effect of AFO-OD on muscle activity during the gait cycle in individuals affected by stroke. Methods: Electromyography (EMG) was used to assess gait at a self-selected speed while wearing an AFO-OD or an AFO with a plantarflexion stop (AFO-PS) worn on the affected side in 11 stroke survivors and on the right side in 11 age-matched healthy adults. EMG signals were obtained from the tibialis anterior (TA), gastrocnemius (GAS), and soleus (SOL) muscles. In addition, the ankle joint angle under both braces and the plantarflexion resistance torque (PFRT) under AFO-OD were monitored. Results: Peak PFRT under AFO-OD was observed during the loading response phase (LRP) in both groups. AFO-OD promoted adequate plantarflexion during LRP in the stroke group, whereas AFO-PS did not. Compared with the AFO-PS, the AFO-OD significantly reduced GAS EMG amplitude during LRP in the stroke group, which was significantly correlated with peak PFRT during LRP. Conclusion: AFO-OD assisted the "heel rocker function" and reduced GAS muscle EMG amplitude during LRP. (C) 2010 Elsevier B.V. All rights reserved.