DIAPHRAGM MOTOR UNIT RECRUITMENT DURING VENTILATORY AND NONVENTILATORY BEHAVIORS
DIAPHRAGM MOTOR UNIT RECRUITMENT DURING VENTILATORY AND NONVENTILATORY BEHAVIORS
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DOI：
10.1152/jappl.1989.66.6.2539
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发表时间：
1989-06-01
影响因子：
3.3
通讯作者：
FOURNIER, M
中科院分区：
文献类型：
--
作者：
SIECK, GC;FOURNIER, M
通过测量跨膈压力 (Pdi) 来确定不同通气和非通气行为期间隔膜 (DIA) 产生的力。和平时期产生的Pdi仅为.apprx。双侧膈神经刺激产生的最大Pdi（Pdimax）的12%。当动物呼吸 10% O2 和 5% CO2 的气体混合物时，Pdi 增加至 .apprx。 Pdimax 的 28%。在完全气道闭塞期间，隔膜产生的 Pdi 增加至 .apprx。 Pdimax 的 49%。只有在呕吐反射和打喷嚏期间，Pdi 才达到最高水平。基于膈肌内不同运动单位类型的比例、每种单位类型产生的相对强直张力以及运动单位募集有序模式的假设，提出了在这些不同行为期间膈肌运动单位募集的模型。
The forces generated by the act diaphragm (DIA) during different ventilatory and nonventilatory behaviors were determined by measuring transdiaphragmatic pressures (Pdi). The Pdi generated during eupnea was only .apprx. 12% of the maximum Pdi (Pdimax) generated by bilateral phrenic nerve stimulation. When the animals breathed a gas mixture of 10% O2 and 5% CO2, the Pdi increased to .apprx. 28% of Pdimax. During total airway occlusion, the Pdi generated by the diaphragm increased to .apprx. 49% of Pdimax. Only during the gag reflex and sneezing did Pdi reach maximal levels. A model for diaphragm motor unit recruitment during these different behaviors was presented based on the proportion of different motor unit types within the diaphragm, the relative tetanic tensions produced by each unit type, and the assumption of an orderly pattern of motor unit recruitment.