Corticospinal excitability of tibialis anterior and soleus differs during passive ankle movement
Corticospinal excitability of tibialis anterior and soleus differs during passive ankle movement
复制标题
被动踝关节运动期间胫骨前肌和比目鱼肌的皮质脊髓兴奋性不同
作者：
Jakob Škarabot;Paul Ansdell;C. Brownstein;K. Hicks;G. Howatson;S. Goodall;R. Durbaba
本研究的目的是评估被动踝关节运动时比目鱼肌（SOL）和胫前肌（TA）在节段水平上的皮质脊髓兴奋性。通过四个实验组成部分来评估被动踝关节运动和肌肉长度对不同肌肉长度的皮质脊髓兴奋性（MEP/Mmax）、腰椎节段水平的皮质下兴奋性（LEP/Mmax）、皮质内抑制（SICI）和促进（ICF）以及SOL和TA的h反射的影响。此外，在一个亚群中，在被动踝关节运动期间，对SOL和TA之间的肌束长度变化程度进行了评估。在被动缩短和延长SOL和TA时，肌束随着关节运动而缩短和延长，其程度相似（p < 0.001）。静息运动阈值在SOL组高于TA组（p≤0.014）。相对于静止位置被动缩短（p≤0.023）和被动延长（p≤0.001）时，TA的MEP/Mmax均得到促进，但无论刺激点的肌肉长度如何（p = 0.922）， SOL的被动踝关节运动时MEP/Mmax保持相似（p≥0.497）。LEP/Mmax （SOL: p = 0.075, TA: p = 0.071）、SICI （SOL: p = 0.427, TA: p = 0.540）和ICF （SOL: p = 0.177, TA: p = 0.777）在被动踝关节运动时保持相似。不同条件下TA的h反射没有差异（p = 0.258），但与SOL的缩短相比，被动延长时h反射减少（p = 0.048）。这些结果表明，在被动运动中，足底肌和背屈肌之间的皮质脊髓兴奋性调节存在差异。观察到的皮质脊髓行为可能是由于肌肉缩短期间传入输入减少导致皮质脊髓驱动增加而介导的，并且似乎是屈肌偏倚的。
The purpose of this study was to assess corticospinal excitability of soleus (SOL) and tibialis anterior (TA) at a segmental level during passive ankle movement. Four experimental components were performed to assess the effects of passive ankle movement and muscle length on corticospinal excitability (MEP/Mmax) at different muscle lengths, subcortical excitability at the level of lumbar spinal segments (LEP/Mmax), intracortical inhibition (SICI) and facilitation (ICF), and H-reflex in SOL and TA. In addition, the degree of fascicle length changes between SOL and TA was assessed in a subpopulation during passive ankle movement. Fascicles shortened and lengthened with joint movement during passive shortening and lengthening of SOL and TA to a similar degree (p < 0.001). Resting motor threshold was greater in SOL compared to TA (p ≤ 0.014). MEP/Mmax was facilitated in TA during passive shortening relative to the static position (p ≤ 0.023) and passive lengthening (p ≤ 0.001), but remained similar during passive ankle movement in SOL (p ≥ 0.497), regardless of muscle length at the point of stimulus (p = 0.922). LEP/Mmax (SOL: p = 0.075, TA: p = 0.071), SICI (SOL: p = 0.427, TA: p = 0.540), and ICF (SOL: p = 0.177, TA: p = 0.777) remained similar during passive ankle movement. H-reflex was not different across conditions in TA (p = 0.258), but was reduced during passive lengthening compared to shortening in SOL (p = 0.048). These results suggest a differential modulation of corticospinal excitability between plantar and dorsiflexors during passive movement. The corticospinal behaviour observed might be mediated by an increase in corticospinal drive as a result of reduced afferent input during muscle shortening and appears to be flexor-biased.
人类运动皮层的体感反应。
影响因子：
2.5
作者：
Shaikhouni,Ammar;Donoghue,JohnP;Hochberg,LeighR
通讯作者：
Hochberg,LeighR