Dissociation between diaphragmatic and rib cage muscle fatigue.
Dissociation between diaphragmatic and rib cage muscle fatigue.
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膈肌和肋骨肌肉疲劳之间的分离。
DOI：
10.1152/jappl.1988.64.3.959
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Grassino,A
中科院分区：
文献类型：
--
作者：
Fitting,JW;Bradley,TD;Easton,PA;Lincoln,MJ;Goldman,MD;Grassino,A
为了评估胸廓肌肉疲劳及其与肌肉疲劳的关系，我们用细线电极记录胸骨旁肋间肌（PS）、胸锁乳突肌（SM）和颈阔肌的肌电图（EMG），用食管电极记录膈肌的肌电图（DI）。六名正常人在吸气阻力呼吸进行了研究。施加两种不同的呼吸模式：主要是呼吸或主要是胸腔呼吸。疲劳的发展通过分析EMG的高-低（H/L）比率来评估。为了确定PS和SM的适当频带，我们通过傅立叶分析建立了它们的EMG功率谱。PS和SM的质心频率的平均值和SD分别为312 ± 16 Hz和244 ± 48 Hz。当以呼吸模式呼吸时，所有受试者均显示DI的H/L下降，没有PS或SM的H/L下降。在肋骨强调期间，五分之四的受试者显示PS的H/L下降，六分之五显示SM的H/L下降。4名受试者的DI的H/L没有下降;另外2名受试者无法在很大程度上抑制膈肌活动，但DI的H/L确实下降。颈阔肌的活动是最小的或没有强调时，但通常是强大的胸腔呼吸。我们的结论是，根据吸气肌的募集模式，隔膜或胸骨旁和胸锁乳突肌的疲劳可以独立发生。（250字处删节）
To assess rib cage muscle fatigue and its relationship to diaphragmatic fatigue, we recorded the electromyogram (EMG) of the parasternal intercostals (PS), sternocleidomastoid (SM), and platysma with fine wire electrodes and the EMG of the diaphragm (DI) with an esophageal electrode. Six normal subjects were studied during inspiratory resistive breathing. Two different breathing patterns were imposed: mainly diaphragmatic or mainly rib cage breathing. The development of fatigue was assessed by analysis of the high-to-low (H/L) ratio of the EMG. To determine the appropriate frequency bands for the PS and SM, we established their EMG power spectrum by Fourier analysis. The mean and SD for the centroid frequency was 312 ± 16 Hz for PS and 244 ± 48 Hz for SM. When breathing with the diaphragmatic patterns, all subjects showed a fall in H/L of the DI and none had a fall in H/L of the PS or SM. During rib cage emphasis, four out of five subjects showed a fall in H/L of the PS and five out of six showed a fall in H/L of the SM. Four subjects showed no fall in H/L of the DI; the other two subjects were unable to inhibit diaphragm activity to a substantial degree and did show a fall in H/L of the DI. Activity of the platysma was minimal or absent during diaphragmatic emphasis but was usually strong during rib cage breathing. We conclude that fatigue of either the diaphragm or the parasternal and sternocleidomastoid can occur independently according to the recruitment pattern of inspiratory muscles.(ABSTRACT TRUNCATED AT 250 WORDS)