多频阻抗肌电图：PhaseX效应
Multi-Frequency Impedance Myography: The PhaseX Effect
摘要：
在假肢中，肌肉收缩通常通过EMG检测。然而，由于电极运动引起的信号干扰可能导致误解。因此，需要替代的测量方法来增加结果的可靠性。在这项工作中，提出了一种新的方法的基础上阻抗肌。通过肌肉的等效电路，分析了肌肉收缩时的电特性。在这项分析中，描述了一种名为PhaseX效应的新生物医学标记物。这种效应基于肌肉收缩时相位响应的特定行为，并且由于其高信号鲁棒性和低信号处理要求而令人感兴趣。还分析了这种效应对电极运动的弹性。在相应肌肉的松弛和收缩期间，对三个受试者的前臂进行复阻抗肌电频谱的测量。受试者测量显示了肌肉模型的预期行为。通过对相位响应的简单分析，可以很容易地检测到实际的肌肉收缩。为了更好的可视化，在获取运动前臂的同步视频的同时重复测量。在肌肉收缩期间相位响应的特定效果可以用作新的标记，其可以在诸如假体控制的若干应用中是有益的。PhaseX效应具有高可靠性和低信号处理要求，使其优于其他肌肉活动标记物。可靠的标记和简单的信号分析相结合，有望成为一种新的方法，假肢控制。
英文摘要：
Muscle contraction is often detected via EMG in prosthetics. However, signal disturbances due to electrode motions can lead to misinterpretations. Therefore, alternative measurement approaches are desired to increase the reliability of the results. In this work, a novel approach based on impedance myography is proposed. By means of an equivalent circuit of a muscle, its electrical characteristics during contractions are analyzed. In this analysis, a new biomedical marker named the PhaseX Effect is described. This effect is based on the specific behavior of the phase response when the muscle is contracted and is interesting due to its high signal robustness and low signal processing requirements. The resilience of this effect against electrode motion is also analyzed. Measurements of the complex impedance myography spectra are performed on the forearms of three subjects during relaxation and contraction of the corresponding muscle. The subject measurements show the expected behavior of the muscle model. Actual muscle contractions can easily be detected via a simple analysis of the phase response. For a better visualization, the measurements are repeated while acquiring a synchronized video of the moving forearm. The particular effect of the phase response during muscle contraction can be used as a new marker that can be beneficial in several applications such as prostheses control. The PhaseX Effect has high reliability and low signal processing requirements, making it advantageous over other muscle activity markers. The combination of a reliable marker and simple signal analysis promises to become a new method for prostheses control.
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