A Simulation Study on the Dominance of the Tissues' Conductivity in the Muscle Recruitment
A Simulation Study on the Dominance of the Tissues' Conductivity in the Muscle Recruitment
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DOI：
10.1166/jmihi.2013.1139
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发表时间：
2013-03-01
影响因子：
--
通讯作者：
Yu, Wenwei
中科院分区：
文献类型：
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作者：
Gomez-Tames, Jose;Gonzalez, Jose;Yu, Wenwei
经皮电刺激的效果在很大程度上取决于刺激方案和参数。不同的刺激方案，如脉冲电流（PC）和突发调制交流电（BMAC），以及这些方案的不同参数，已被提出，以引起更大的肌肉扭矩，同时保持舒适。然而，对于哪种方案和参数具有更好的力生成能力，还没有达成共识。一些研究人员认为，通过降低组织的阻抗，能量转移到肌肉中的增加，提高了力量。因此，一些研究已经测量了组织内的电流密度分布和传输，但是阻抗降低作为改善力的机制仍然不清楚。此外，其他研究模拟了电导率的各向异性和不均匀性，表明细胞外介质的电导率可以对细胞外电场产生的神经元兴奋产生强烈影响。然而，他们的模型有一些局限性：点电极的就业，肌肉电导率的变化被省略，解剖方面没有考虑在模型的几何形状。在这项研究中，我们研究了组织的导电性对肌肉招聘的影响，通过实施一个3D多层大腿模型加上一组哺乳动物神经，支配简化的半腱肌。因此，我们明确了皮肤阻抗不影响募集，脂肪和肌肉在TES的正常操作条件下对肌肉激活有很大的影响。
The effect of transcutaneous electrical stimulation depends greatly on stimulation schemes and parameters. Different stimulation schemes, such as pulse current (PC) and burst-modulated alternating current (BMAC), and different parameters for these schemes have been proposed to elicit greater muscle torque while keeping comfort. Though, there is no consensus on which scheme and parameters have better force-generating capacity. Some researchers argued that by decreasing the impedance of the tissues the transfer of energy into the muscle increases, improving force. Thus, some studies have measured the current density distribution and transmission within the tissues, but the impedance reduction as a mechanism to improve force is still not clear. In addition, other studies have simulated the anisotropy and inhomogeneity of the conductivity, showing that the conductivity of the extracellular medium can have a strong influence on the neuronal excitation generated by extracellular electric fields. However, their models had some limitations: employment of point electrodes, muscle conductivity variation was omitted, and anatomical aspects were not considered in the geometry of the model. In this study, we investigated the effect of the conductivity of the tissues on the muscle recruitment by implementing a 3D multi-layer thigh model coupled with a group of mammalian nerves that innervate a simplified Semitendinosus muscle. As a result, we made clear that skin impedance did not affect the recruitment and fat and muscle had a large influence on the muscle activation under normal operation conditions of the TES.