Different modulation of oscillatory common neural drives to ankle muscles during abrupt and gradual gait adaptations
Different modulation of oscillatory common neural drives to ankle muscles during abrupt and gradual gait adaptations
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DOI：
10.1007/s00221-021-06294-3
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发表时间：
2022-01-25
影响因子：
2
通讯作者：
Yamada, Shigehito
中科院分区：
文献类型：
--
作者：
Kitatani, Ryosuke;Maeda, Ayaka;Yamada, Shigehito
当引入不同误差大小的扰动时，可能涉及不同的神经对运动学习的贡献。虽然皮质脊髓驱动有助于突然步态适应过程中，没有研究调查是否皮质参与步态之间的扰动突然和逐渐应用的不同。本研究的目的是调查振荡的共同神经驱动踝关节肌肉在步态之间的突然和渐进的适应，使用成对的表面肌电图（EMG）记录的相干性分析的差异。16名健康的年轻人在两种条件下进行了10分钟的跑步机步态，其中包括：突然（从适应期开始的大扰动）和逐渐（一系列逐渐增加的小扰动）。摆动相持续时间和步长在适应早期的突然条件下比在逐渐条件下显示出显著更大的不对称性（p < 0.01），尽管在适应后早期的两种条件之间的步态对称性没有显著差异。从扰动侧胫骨前肌β频段（15-35 Hz）计算的EMG-EMG相干性在突然条件下的早期适应期显著较高（p < 0.05），但在渐进条件下不显著。两种情况下，不同适应期的步态时间对称性变化与肌电-肌电一致性变化之间存在显著相关性（p < 0.05）。突然的大扰动似乎需要皮质参与，而逐渐适应小步态不对称不需要皮质参与调制。
Different neural contributions to motor learning might be involved when different error sizes of perturbation are introduced. Although the corticospinal drive contributes to abrupt gait adaptation processes, no studies have investigated whether cortical involvement during gait differs between perturbations applied abruptly and gradually. This study aimed to investigate the differences in oscillatory common neural drives to ankle muscles during gait between abrupt and gradual adaptations, using coherence analyses of paired surface electromyographic (EMG) recordings. Sixteen healthy young adults performed the treadmill gait with perturbation resisting forward movement of the swing leg for 10 min under two conditions: abrupt (a large perturbation from the beginning of the adaptation period) and gradual (a series of small perturbations that gradually increased). Swing phase duration and step length showed significantly greater asymmetry in the abrupt condition than in the gradual condition in the early adaptation period (p < 0.01), despite no significant differences in gait symmetries between the two conditions in the early post-adaptation period. EMG-EMG coherence calculated from the tibialis anterior muscle in the beta band (15-35 Hz) on the perturbed side was significantly higher in the early adaptation period in the abrupt condition (p < 0.05), but not in the gradual condition. There were significant relationships between changes in temporal gait symmetry and EMG-EMG coherence during the different adaptation periods between the two conditions (p < 0.05). The abrupt large perturbation seems to require a cortical involvement, whereas a gradual adaptation with small gait asymmetry requires no modulation of cortical involvement.