Electromyogram patterns during plantarflexions at various angular velocities and knee angles in human triceps surae muscles
Electromyogram patterns during plantarflexions at various angular velocities and knee angles in human triceps surae muscles
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人类小腿三头肌在不同角速度和膝角下跖屈时的肌电图模式
DOI：
10.1007/s004210050118
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
H. Kurata
中科院分区：
文献类型：
--
作者：
H. Tamaki;Kohji Kitada;Takuya Akamine;T. Sakou;H. Kurata
摘要为了研究不同膝关节角度和踝关节角速度对肌肉协同活动的影响，记录了小腿三头肌，即腓肠外侧肌（LG）、腓肠内侧肌（MG）和比目鱼肌（SOL）的表面肌电图（EMG）。六名健康年轻男性在恒定负荷（5%和10%最大自主收缩）下以6、30和60°·s-1的三种脚踝角速度以及0、30和60°的三个膝盖角度（0°等于完全伸展）进行脚踝跖屈。 在膝关节完全伸直角度（0°）时，随着角速度的增加，MG和LG踝关节跖屈时的积分肌电峰值（iEMG峰值）显著增加（P < 0.05），而SOL踝关节跖屈时的积分肌电峰值显著降低（P < 0.05）。另一方面，虽然在屈曲膝关节角度（30 °和60°）时每块肌肉中峰值iEMG的变化模式与在完全伸展膝关节角度时观察到的模式非常相似，但角速度之间没有显著差异。在踝关节跖屈运动中，在任意角速度下（6、30和60°·s-1），SOL的iEMG峰值显著增加（P < 0.05），而MG的iEMG峰值随膝关节角度的增加而显著降低（P < 0.05）。 这些结果表明，根据角速度，人类运动单位有选择性募集的可能性;然而，这种行为似乎会被固定在屈曲的膝关节角度削弱，这会对腓肠肌产生抑制性影响，对SOL产生促进性影响。
Abstract To investigate the influence of the various knee angles and ankle angular velocities on synergistic muscle activities, the surface electromyograms (EMG) were recorded from the triceps surae muscles, i.e. lateral gastrocnemius (LG), medial gastrocnemius (MG) and soleus (SOL) muscles. Six healthy young men performed ankle plantarflexions at three ankle angular velocities of 6, 30 and 60° · s−1 and three knee angles of 0, 30 and 60° (0° equalling full extension) under constant load (5% and 10% maximal voluntary contraction). At the fully-extended knee angle (0°), peak values of integrated EMG (peak iEMG) during ankle plantarflexions were significantly increased (P < 0.05) in MG and in LG, but significantly decreased (P < 0.05) in SOL with increasing angular velocity. On the other hand, although the patterns of variation of the peak iEMG in each muscle at flexed knee angles (30 and 60°) were very similar to the patterns seen at the fully-extended knee angle, there were no significant differences among angular velocities. During ankle plantarflexions at any of the angular velocities (6, 30 and 60° · s−1) the peak iEMG were significantly increased (P < 0.05) in SOL, but were significantly decreased (P < 0.05) in MG following increases in the knee angles. These results would suggest the possibility of selective recruitment of motor units in humans depending on the angular velocity; however, this behaviour would appear to be weakened by fixing at flexed knee angles which cause an inhibitory influence on gastrocnemius muscles and a facilitative influence on SOL.