Error variability affects the after effects following motor learning of lateral balance control during walking in people with spinal cord injury.
Error variability affects the after effects following motor learning of lateral balance control during walking in people with spinal cord injury.
复制标题
误差变异性影响脊髓损伤患者行走期间横向平衡控制运动学习的后遗症。
DOI：
10.1111/ejn.14478
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Wu,Ming
中科院分区：
文献类型：
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作者：
Lin,Jui-Te;Hsu,Chao-Jung;Dee,Weena;Chen,David;Rymer,WilliamZev;Wu,Ming
患有不完全脊髓损伤（iSCI）的人通常在行走时表现出横向平衡控制障碍。有效的干预措施，以改善平衡控制仍然缺乏，可能是由于有限的了解运动学习机制。本研究的目的是确定误差大小和误差变异性如何影响iSCI患者行走过程中横向平衡控制的运动学习。招募了15名iSCI患者。使用定制的线缆驱动机器人系统在内外侧方向上对骨盆施加受控辅助力。参与者使用3种条件进行测试，包括突然，渐进和各种力量。在每种情况下，参与者在跑步机上行走，不用力1分钟（基线），用力9分钟（适应），然后再不用力2分钟（适应后）。计算足跟接触时的稳定裕度（MoS_HC）和最小值力矩（MoS_Min），以比较不同条件下的学习效果。还收集了来自较弱腿的肌电图信号。对于所有三种条件，在适应后期间，受试者在力释放后的MoS_Min（后效）均有所增加。与渐变和突变力条件相比，受试者在变化条件下的MoS_Min表现出更快的适应和更短的后效。增加的误差变异性可能有助于iSCI患者在行走过程中进行横向平衡控制的运动学习，尽管更快的学习可能会导致更短的后效。误差大小对后效的持续时间没有影响。
People with incomplete spinal cord injury (iSCI) usually show impairments in lateral balance control during walking. Effective interventions for improving balance control are still lacking, probably due to limited understanding of motor learning mechanisms. The objective of this study was to determine how error size and error variability impact the motor learning of lateral balance control during walking in people with iSCI. Fifteen people with iSCI were recruited. A controlled assistance force was applied to the pelvis in the medial‐lateral direction using a customized cable‐driven robotic system. Participants were tested using 3 conditions, including abrupt, gradual, and varied forces. In each condition, participants walked on a treadmill with no force for 1 min (baseline), with force for 9 min (adaptation), and then with no force for additional 2 min (post‐adaptation). The margin of stability at heel contact (MoS_HC) and minimum value moment (MoS_Min) were calculated to compare the learning effect across different conditions. Electromyogram signals from the weaker leg were also collected. Participants showed an increase in MoS_Min (after effect) following force release during the post‐adaptation period for all three conditions. Participants showed a faster adaptation and a shorter lasting of after effect in MoS_Min for the varied condition in comparison with the gradual and abrupt force conditions. Increased error variability may facilitate motor learning in lateral balance control during walking in people with iSCI, although a faster learning may induce a shorter lasting of after effect. Error size did not show an impact on the lasting of after effect.