Beta, gamma band, and high-frequency coherence of EMGs of vasti muscles caused by clustering of motor units
Beta, gamma band, and high-frequency coherence of EMGs of vasti muscles caused by clustering of motor units
复制标题
运动单位聚集引起的股阔肌肌电图的贝塔、伽玛带和高频相干性
作者：
V. von Tscharner;Martin Ullrich;M. Mohr;Daniel Comaduran Marquez;B. Nigg
在跑步运动中，股肌稳定膝关节。这需要一些运动单元来同步。测试来自股肌（VM和VL）的EMG在四个频带中是相干的假设，一个低于30 Hz，40 Hz（30-45 Hz），中间频带高达120 Hz，以及高频带（135-280 Hz）。由于在一个步骤期间的VM和在另一个步骤期间的VL包含共同的EMG信号部分，所以当在从一个步骤获得的EMGVM和前一步骤的EMGVL之间计算相干性时，低频处的步骤间相干性不会消失。12名参与者在跑步机上以2.9 m/s的速度跑了15 min。使用双极电流放大器记录股肌肌电图。普通的相干性之间的EMGVM和EMGVL和步骤间的条件计算。在所有频带中观察到显著的相干性。在中频和高频范围内，相干性消失的步骤间的条件，而低频相干性仍然存在。必须考虑四个频带。有人提出，在低频率的相干性反映了皮质-肌肉的相互作用。然而，运动单位动作电位的聚集也足以产生低频相干性。存在由在不同步骤中相似的股肌的EMG产生的低频相干性。因此，至少必须考虑这三种影响，才能从跑步时发生的低频下的股肌连贯性中得出结论。
The vasti muscles stabilize the knee joint during the running movement. This requires some motor units to synchronize. Test the hypothesis that EMGs from the vasti muscles (VM and VL) are coherent in four frequency bands, one below 30 Hz, the 40 Hz (30–45 Hz), the middle band up to 120 Hz, and the high-frequency band (135–280 Hz). Because the VM during one step and the VL during another step contain common EMG signal parts the inter-step coherence at low frequencies does not disappear when the coherence is computed between the EMGVM obtained from one step and the EMGVL of the previous step. Twelve participants ran on a treadmill at 2.9 m/s for 15 min. EMGs were recorded from the vasti muscles using bipolar current amplifiers. Ordinary coherence was computed between the EMGVM and EMGVL and for the inter-step-condition. Significant coherence was observed in all frequency bands. In the mid- and high-frequency range, coherence disappears for the inter-step condition, whereas the low-frequency coherence is still present. Four frequency bands must be considered. It was proposed that coherence at low frequencies reflects cortico-muscular interactions. However, the clustering of motor unit action potentials is sufficient to generate the low-frequency coherence as well. There is a low-frequency coherence resulting from EMGs of the vasti muscles that are similar in different steps. Therefore, at least these three effects must be considered to draw conclusions from the coherence of the vasti muscles at low frequencies that occur while running.
影响因子：
3.3
作者：
Keenan, KG;Farina, D;Enoka, RM
通讯作者：
Enoka, RM