Effect of sensory inputs on the soleus H-reflex amplitude during robotic passive stepping in humans
Effect of sensory inputs on the soleus H-reflex amplitude during robotic passive stepping in humans
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DOI：
10.1007/s00221-009-2145-2
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发表时间：
2010-04-01
影响因子：
2
通讯作者：
Nakazawa, Kimitaka
中科院分区：
文献类型：
--
作者：
Kamibayashi, Kiyotaka;Nakajima, Tsuyoshi;Nakazawa, Kimitaka
我们研究了比目鱼肌（溶胶）霍夫曼（H-）反射兴奋性的调制外周感觉输入被动步进使用机器人驱动的步态矫形器在健康受试者和脊髓损伤患者。溶胶H-反射诱发在站立和六个阶段，在40和100%体重卸载条件下，在被动步进。与站立姿势相比，在每种无负荷条件下，被动踏步时，Sol H反射的兴奋性被显著抑制。在被动步进，H-反射幅度显着较小，在早期和中期摆动阶段比在站立阶段，这是类似的调制模式，以前报道的正常行走。在被动踏步过程中，两种无负荷条件下的H反射振幅无显著差异。在被动踏步过程中，在摆动阶段的早期观察到的反射抑制可能归因于髋关节和膝关节屈曲引起的感觉输入。本研究提供的证据表明，外周感觉输入有一个显着的作用，在步行过程中的Sol H反射的相位依赖性调制，和Sol H反射的兴奋性可能会受到影响较小的负荷相关的传入在步行过程中。
We investigated the modulation of the soleus (Sol) Hoffmann (H-) reflex excitability by peripheral sensory inputs during passive stepping using a robotic-driven gait orthosis in healthy subjects and spinal cord-injured patients. The Sol H-reflex was evoked at standing and at six phases during passive stepping in 40 and 100% body weight unloaded conditions. The Sol H-reflex excitability was significantly inhibited during passive stepping when compared with standing posture at each unloaded condition. During passive stepping, the H-reflex amplitude was significantly smaller in the early- and mid-swing phases than in the stance phase, which was similar to the modulation pattern previously reported for normal walking. No significant differences were observed in the H-reflex amplitude between the two unloaded conditions during passive stepping. The reflex depression observed at the early part of the swing phase during passive stepping might be attributed to the sensory inputs elicited by flexion of the hip and knee joints. The present study provides evidence that peripheral sensory inputs have a significant role in phase-dependent modulation of the Sol H-reflex during walking, and that the Sol H-reflex excitability might be less affected by load-related afferents during walking.