Regional differences in length change and electromyographic heterogeneity in sternohyoid muscle during infant mammalian swallowing
Regional differences in length change and electromyographic heterogeneity in sternohyoid muscle during infant mammalian swallowing
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DOI：
10.1152/japplphysiol.00353.2010
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发表时间：
2010-08-01
影响因子：
3.3
通讯作者：
German, Rebecca Z.
中科院分区：
文献类型：
--
作者：
Konow, Nicolai;Thexton, Allan;German, Rebecca Z.
Konow N，Thexton A，Crompton AW，German RZ.幼年哺乳动物吞咽过程中胸骨舌骨肌长度变化和肌电异质性的区域差异。J Appl Physiol 109：439 - 448，2010.首次发表于2010年6月10日; doi：10.1152/japplphysiol.00353.2010。在许多哺乳动物的行为中，复杂的肌肉吊索移动并稳定舌骨。胸骨舌骨肌在食物获取、加工和吞咽过程中以及非进食行为中被招募。我们使用同步声显微测量和肌电图研究区域（肌内）的长度变化和肌电图（EMG）活动的胸骨舌骨在吞咽过程中的幼猪。胸骨舌骨肌简单的带状结构使我们假设，有限的区域变化的长度和肌肉活动将存在。我们发现，统计学上显着的区域差异，肌电图活动，和长度动力学方面，胸骨舌骨肌吞咽过程中没有表现均匀。中腹区域通常缩短，而前部和后部区域延长，尽管在少数燕子（12.5%）中腹与端部区域同时延长。尽管其nonpennate架构和进化保守的神经支配，哺乳动物胸骨舌骨似乎包含以前未被识别的人口的区域专门的运动单位。它还显示出不同的收缩模式，非常类似于非哺乳类脊椎动物的胸骨舌骨。
Konow N, Thexton A, Crompton AW, German RZ. Regional differences in length change and electromyographic heterogeneity in sternohyoid muscle during infant mammalian swallowing. J Appl Physiol 109: 439-448, 2010. First published June 10, 2010; doi:10.1152/japplphysiol.00353.2010.-A complex sling of muscles moves and stabilizes the hyoid bone during many mammalian behaviors. One muscle in this sling, the sternohyoid, is recruited during food acquisition, processing, and swallowing, and also during nonfeeding behaviors. We used synchronous sonomicrometry and electromyography to investigate regional (intramuscular) changes in length and electromyographic (EMG) activity of the sternohyoid during swallowing in the infant pig. The simple straplike architecture of the sternohyoid led us to hypothesize that limited regional variation in length and muscle activity would be present. We found statistically significant regional differences in EMG activity, and, with respect to length dynamics, the sternohyoid did not behave homogeneously during swallowing. The midbelly region typically shortened while the anterior and posterior regions lengthened, although in a minority of swallows (12.5%) the midbelly lengthened simultaneously with the end-regions. Despite its nonpennate architecture and evolutionarily conservative innervation, the mammalian sternohyoid appears to contain previously unrecognized populations of regionally specialized motor units. It also displays differential contraction patterns, very similar to the sternohyoid of nonmammalian vertebrates.