Mechanical function of hyoid muscles during spontaneous breathing in cats.
Mechanical function of hyoid muscles during spontaneous breathing in cats.
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猫自主呼吸过程中舌骨肌肉的机械功能。
DOI：
10.1152/jappl.1987.62.2.582
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Cherniack,NS
中科院分区：
文献类型：
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作者：
vanLunteren,E;Haxhiu,MA;Cherniack,NS
我们评估了机械行为的颏舌骨肌和胸骨舌骨肌在自主呼吸过程中使用sonomicrometry在麻醉猫。当动物呼吸氧气时，舌骨肌在吸气过程中要么变长，要么不改变长度（但从未缩短）。在进行性高氧高碳酸血症期间，许多动物发生颏舌骨肌吸气延长的短暂增加;然而，在高PCO 2下，颏舌骨肌在吸气期间总是缩短（CO2再呼吸结束时平均为静息长度的4.9%; P小于0.001）。颏舌骨肌吸气延长变为吸气缩短时的PCO 2显著高于颏舌骨肌电活动开始时的CO2阈值（P <0.01）。对于胸骨舌骨肌，高碳酸血症导致17只猫中的13只吸气延长，4只吸气缩短;在CO2再呼吸结束时，胸骨舌骨肌平均延长静息长度的1.6%（P <0.01）。胸骨舌骨延长发生，尽管这是肌肉电活跃。这些结果表明，舌骨肌电活动和呼吸长度的变化之间的关系是非常复杂的，因此，舌骨肌电活动的存在并不一定表明肌肉缩短，和颏舌骨肌和胸骨舌骨肌之间，颏舌骨肌有一个主要的作用，作为喉咽扩张器在自主呼吸的猫，与胸骨舌骨肌起辅助作用的能力。
We assessed the mechanical behavior of the geniohyoid and sternohyoid muscles during spontaneous breathing using sonomicrometry in anesthetized cats. When the animals breathed O2, the hyoid muscles either became longer or did not change length (but never shortened) during inspiration. During progressive hyperoxic hypercapnia, transient increases in geniohyoid muscle inspiratory lengthening occurred in many animals; however, at high PCO2 the geniohyoid invariably shortened during inspiration (mean 4.9% of resting length at the end of CO2 rebreathing; P less than 0.001). The PCO2 at which geniohyoid inspiratory lengthening changed to inspiratory shortening was significantly higher than the CO2 threshold for the onset of geniohyoid electrical activity (P less than 0.01). For the sternohyoid muscle, hypercapnia caused inspiratory lengthening in 13 of 17 cats and inspiratory shortening in 4 of 17 cats; on average the sternohyoid lengthened by 1.6% of resting length at the end of CO2 rebreathing (P less than 0.01). Sternohyoid lengthening occurred in spite of this muscle being electrically active. These results suggest that the relationship between hyoid muscle electrical activity and respiratory changes in length is very complex, so that the presence of hyoid muscle electrical activity does not necessarily indicate muscle shortening, and among the geniohyoid and sternohyoid muscles, the geniohyoid has a primary role as a hypopharyngeal dilator in the spontaneously breathing cat, with the sternohyoid muscle acting in an accessory capacity.