Evaluation of Respiratory Muscle Activity by Means of Concentric Ring Electrodes
Evaluation of Respiratory Muscle Activity by Means of Concentric Ring Electrodes
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DOI：
10.1109/tbme.2020.3012385
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发表时间：
2021-03-01
影响因子：
4.6
通讯作者：
Garcia-Casado, Javier
中科院分区：
文献类型：
--
作者：
Estrada-Petrocelli, Luis;Torres, Abel;Garcia-Casado, Javier
表面肌电图（sEMG）可用于评估呼吸肌活动。记录sEMG涉及在双极配置中使用表面电极。然而，心电图（ECG）干扰和电极方向代表了双极采集的相当大的缺点。作为替代方案，同心环电极（克雷斯）可用于表面肌电信号采集，并提供了巨大的潜力，由于其增强的空间分辨率和简单的放置协议，这不依赖于肌纤维的方向的呼吸肌活动的评估。这项工作的目的是分析在呼吸sEMG采集过程中克雷斯的性能。使用双极和CRE配置将呼吸肌sEMG应用于膈肌和胸锁乳突肌。32名受试者进行了4次吸气负荷自主呼吸试验，互换电极位置后重复进行。我们计算了吸气期间的参数，例如（1）频谱功率和（2）中值频率，以及吸气sEMG（无ECG）与（3）基础sEMG（无ECG）（R-ins/噪声）、（4）基础sEMG（有ECG）（R-ins/cardio）和（5）呼气sEMG（无ECG）（R-ins/exp）的功率比。频谱功率、R-ins/noise和R-ins/cardio随吸气负荷增加而增加。对于克雷斯，获得了显著更高的R-ins/cardio值（p < 0.05）和显著更高的中值频率。R-ins/噪声和R-ins/exp仅在膈肌sEMG记录中对于双极配置较高，而在胸锁乳突肌记录中没有发现显著差异。我们的研究结果表明，通过表面肌电图的呼吸肌活动的评估可以受益于心脏活动的影响显着减少，增强检测的频率内容和轴向各向同性的克雷斯，这有利于其放置的移动。
Surface electromyography (sEMG) can be used for the evaluation of respiratory muscle activity. Recording sEMG involves the use of surface electrodes in a bipolar configuration. However, electrocardiographic (ECG) interference and electrode orientation represent considerable drawbacks to bipolar acquisition. As an alternative, concentric ring electrodes (CREs) can be used for sEMG acquisition and offer great potential for the evaluation of respiratory muscle activity due to their enhanced spatial resolution and simple placement protocol, which does not depend on muscle fiber orientation. The aim of this work was to analyze the performance of CREs during respiratory sEMG acquisitions. Respiratory muscle sEMG was applied to the diaphragm and sternocleidomastoid muscles using a bipolar and a CRE configuration. Thirty-two subjects underwent four inspiratory load spontaneous breathing tests which was repeated after interchanging the electrode positions. We calculated parameters such as (1) spectral power and (2) median frequency during inspiration, and power ratios of inspiratory sEMG without ECG in relation to (3) basal sEMG without ECG (R-ins/noise), (4) basal sEMG with ECG (R-ins/cardio) and (5) expiratory sEMG without ECG (R-ins/exp). Spectral power, R-ins/noise and R-ins/cardio increased with the inspiratory load. Significantly higher values (p < 0.05) of R-ins/cardio and significantly higher median frequencies were obtained for CREs. R-ins/noise and R-ins/exp were higher for the bipolar configuration only in diaphragm sEMG recordings, whereas no significant differences were found in the sternocleidomastoid recordings. Our results suggest that the evaluation of respiratory muscle activity by means of sEMG can benefit from the remarkably reduced influence of cardiac activity, the enhanced detection of the shift in frequency content and the axial isotropy of CREs which facilitates its placement.