SPECTRAL ANALYSIS OF HUMAN INSPIRATORY DIAPHRAGMATIC ELECTROMYOGRAMS
SPECTRAL ANALYSIS OF HUMAN INSPIRATORY DIAPHRAGMATIC ELECTROMYOGRAMS
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DOI：
10.1152/jappl.1979.46.1.152
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发表时间：
1979-01-01
影响因子：
3.3
通讯作者：
LYNNEDAVIES, P
中科院分区：
文献类型：
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作者：
SCHWEITZER, TW;FITZGERALD, JW;LYNNEDAVIES, P
通过食管电极记录 6 名正常受试者的吸气膈肌肌电图。在带通滤波（20-1600 Hz）之前和之后，通过功率密度谱分析来分析 EMG 和 ECG 信号。 EMG 频谱集中在 25-250 Hz 的带宽内。电极运动仅在低频时才会产生明显的伪影。心电图频谱也集中在较低频率，但心脏信号的大量能量溢出到大部分肌电图频谱。因此，带通滤波可以有效地减少前者，但不能有效地减少后者。在用于量化肌电图谱的各种功率和频率参数中，最稳定的是质心频率。这在受试者内部和受试者之间是可重复的，并且不受潮气量或吸气流速变化的影响。
The inspiratory diaphragmatic EMG [electromyogram] was recorded by way of esophageal electrodes in 6 normal subjects. The EMG and ECG signals were analyzed by power density spectral analysis, before and after band-pass filtering (20-1600 Hz). The EMG spectrum was concentrated in the bandwidth 25-250 Hz. Electrode motion introduced a significant artifact only at low frequencies. The ECG spectrum was also concentrated at lower frequencies, but substantial power from the cardiac signal spilled over across most of the EMG spectrum. Band-pass filtering was therefore effective in minimizing the former but not the latter. Of the various power and frequency parameters used to quantitate the EMG spectrum, the most stable was the centroid frequency. This was reproducible within and between subjects, and was not affected by changing tidal volume or inspiratory flow rate.