Thyroarytenoid muscle activity during loaded and nonloaded breathing in adult humans.
Thyroarytenoid muscle activity during loaded and nonloaded breathing in adult humans.
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成年人有负荷和无负荷呼吸期间的甲杓肌活动。
DOI：
10.1152/jappl.1991.70.6.2410
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Bellia,V
中科院分区：
文献类型：
--
作者：
Insalaco,G;Kuna,ST;Costanza,BM;Catania,G;Cibella,F;Bellia,V
以前的光纤研究表明，在人类呼气阻力负荷的应用过程中，在呼气声门孔径变窄。本文研究了9名健康受试者，以确定呼气阻力负荷对声带内收肌甲杓肌（TA）肌电图活动的影响。9名受试者中有4名还接受了吸气阻力负荷和自主延长吸气（TI）或呼气（TE）时间的应用。肌内钩丝电极记录TA活性。在所有受试者的安静呼吸期间，TA在呼气时是阶段性活跃的，并且在整个呼吸周期中通常是紧张性活跃的。随着呼气负荷水平的增加，TA呼气活动逐渐增加。吸气负荷导致TA“吸气”活动增加。自愿延长TE至与负荷呼吸期间达到的时间相似的时间，会导致TA呼气活动增加，与负荷状态期间达到的时间相似。TI的自主延长与TA吸气活动的增加相关。在吸气负荷或自愿条件下，TI的类似增加与TA吸气活动的增加相当，在4名受试者中有3名。总之，在呼气阻力负荷的应用过程中，TA的激活增加意味着在呼气负荷过程中报告的声门孔径变窄是一种主动现象。电阻性负荷下TA激活的变化似乎与呼吸模式的变化有关。
Previous fiber-optic studies in humans have demonstrated narrowing of the glottic aperture in expiration during application of expiratory resistive loads. Nine healthy subjects were studied to determine the effect of expiratory resistive loads on the electromyographic activity of the thyroarytenoid (TA) muscle, a vocal cord adductor. Four of the nine subjects also underwent the application of inspiratory resistive loads and voluntary prolongation of either inspiratory (TI) or expiratory (TE) time. TA activity was recorded by intramuscular hooked-wire electrodes. During quiet breathing in all subjects, the TA was phasically active on expiration and often tonically active throughout the respiratory cycle. TA expiratory activity progressively increased with increasing levels of expiratory load. Inspiratory loads resulted in increased TA "inspiratory" activity. Voluntary prolongation of TE to times similar to those reached during loaded breathing induced increases in TA expiratory activity similar to those reached during the loaded state. Voluntary prolongation of TI was associated with an increase in TA inspiratory activity. Similar increases in TI during inspiratory loading or voluntary conditions were associated with comparable increases in TA inspiratory activity in three of the four subjects. In conclusion, increased activation of TA during the application of expiratory resistive loads implies that the reported narrowing of glottic aperture during expiratory loading is an active phenomenon. Changes in activation of the TA with resistive loads appear to be related to changes in respiratory pattern.