JOINT ANGLE DEPENDENCE OF INTERMUSCLE DIFFERENCE IN POSTACTIVATION POTENTIATION
JOINT ANGLE DEPENDENCE OF INTERMUSCLE DIFFERENCE IN POSTACTIVATION POTENTIATION
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DOI：
10.1002/mus.21529
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发表时间：
2010-04-01
期刊：
影响因子：
3.4
通讯作者：
Kawakami, Yasuo
中科院分区：
文献类型：
--
作者：
Miyamoto, Naokazu;Mitsukawa, Naotoshi;Kawakami, Yasuo
本研究旨在探讨踝关节角度对腓肠肌内侧肌（MG）和比目鱼肌（SQL）激活后增强（PAP）肌间差异的影响。在关节角度的中立位置，背屈20度，跖屈20度，诱发抽搐反应，刺激胫后神经与超大强度之前和之后的10-s最大自愿跖屈在每个关节角度。MG和SQL肌肉的机械性能进行了评估，同时和单独使用机械肌电图（MMG），并通过MMG信号的峰-峰幅度的每一块肌肉的增强程度进行了评估。在中立位和背屈位条件化MVC后，MG比比目鱼肌表现出更大的增强作用，而在跖屈位，MG和SQL之间的PAP无显著差异。这些结果表明，协同肌肉之间的PAP幅度的差异是由PAP的关节角度和纤维成分依赖性的组合。肌肉神经41：519-523，2010
The purpose of this study was to examine the effect of ankle joint angle on the intermuscle difference in post-activation potentiation (PAP) between the medial gastrocnemius (MG) and soleus (SQL) muscles. At the neutral position of joint angle, dorsiflexion of 20 degrees, and plantarflexion of 20 degrees, twitch responses were evoked by stimulating the posterior tibial nerve with supramaximal intensity before and after a 10-s maximal voluntary plantarflexion at each joint angle. Mechanical properties of the MG and SQL muscles were assessed simultaneously and separately by using mechanomyography (MMG), and the extent of potentiation of each muscle was evaluated by peak-to-peak amplitude of the MMG signal. The MG showed greater potentiation than the soleus after the conditioning MVC in the neutral and dorsiflexion position, while in the plantarflexion position no significant difference was found in PAP between MG and SQL. These results suggest that the difference in the magnitude of PAP between synergistic muscles is determined by a combination of the joint angle- and fiber composition-dependence of PAP. Muscle Nerve 41: 519-523, 2010