Mechanical function of hyoid muscles during spontaneous breathing in cats.

  title={Mechanical function of hyoid muscles during spontaneous breathing in cats.},
  author={Erik van Lunteren and Musa A. Haxhiu and Neil S. Cherniack},
  journal={Journal of applied physiology},
  volume={62 2},
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… CONTINUE READING
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