Contractile and endurance properties of geniohyoid and diaphragm muscles.
Contractile and endurance properties of geniohyoid and diaphragm muscles.
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颏舌骨肌和膈肌的收缩和耐力特性。
DOI：
10.1152/jappl.1990.69.6.1992
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Dick,TE
中科院分区：
文献类型：
--
作者：
vanLunteren,E;Salomone,RJ;Manubay,P;Supinski,GS;Dick,TE
尽管有关咽扩张肌神经控制的信息丰富，但对其内在生理特性知之甚少。在本研究中，在原位等长收缩性和耐力的咽扩张，颏舌骨肌，比较了12只麻醉人工通气猫的膈肌的属性。颏舌骨肌的收缩时间（平均值+/- SE）（27 +/- 2 ms）短于膈肌（36 +/- 3 ms; P <0.0005），半松弛时间也是如此（29 +/- 2 vs. 45 +/- 4 ms; P <0.002）。颏舌骨肌的收缩和松弛速度比膈肌快，这在两块肌肉的力-频率曲线的形状中得到了适当的反映，颏舌骨肌的力-频率曲线位于膈肌力-频率曲线的右侧。两种肌肉的耐力特性进行了评估，使用重复刺激，在40赫兹的列车持续0.33秒，与一个列车重复每秒。重复刺激2分钟结束时的力与初始力的比值，颏舌骨为0.67 +/- 0.06，膈肌为0.15 +/- 0.03（P <0.00001）。重复刺激后，在一个范围内的刺激频率产生的肌肉力量减少到更大程度的隔膜比颏舌骨肌。这些结果表明，颏舌骨肌有一个更快的生理轮廓比隔膜，但相对耐疲劳时，在高速率驱动。
Despite the wealth of information about the neural control of pharyngeal dilator muscles, little is known about their intrinsic physiological properties. In the present study the in situ isometric contractility and endurance of a pharyngeal dilator, the geniohyoid muscle, were compared with properties of the diaphragm in 12 anesthetized artificially ventilated cats. The contraction time (means +/- SE) of the geniohyoid (27 +/- 2 ms) was shorter than that of the diaphragm (36 +/- 3 ms; P less than 0.0005), as was the half-relaxation time (29 +/- 2 vs. 45 +/- 4 ms; P less than 0.002). The faster contraction and relaxation of the geniohyoid compared with the diaphragm were appropriately reflected in the shape of the force-frequency curves for the two muscles, with that of the geniohyoid located to the right of the diaphragm force-frequency curve. The endurance properties of the two muscles were assessed using repetitive stimulation at 40 Hz in trains lasting 0.33 s, with one train repeated every second. The ratio of force at the end of 2 min of repetitive stimulation to initial force was 0.67 +/- 0.06 for the geniohyoid and 0.15 +/- 0.03 for the diaphragm (P less than 0.00001). After the repetitive stimulation, the muscle force generated in response to a range of stimulus frequencies was reduced to a greater extent for the diaphragm than for the geniohyoid muscle. These results indicate that the geniohyoid muscle has a faster physiological profile than does the diaphragm yet is relatively resistant to fatigue when driven at high rates.
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