Alipour-Haghighi F, Titze I R, Durham P
Department of Speech Pathology and Audiology, Wendell Johnson Speech and Hearing Center, University of Iowa, Iowa City 52242.
J Speech Hear Res. 1987 Sep;30(3):290-4. doi: 10.1044/jshr.3003.290.
The twitch response of the canine vocalis muscle was investigated through a series of experiments conducted in vitro. Samples of vocalis muscle were dissected and prepared from canine larynges a few minutes before death and kept in Krebs solution at a temperature of 37 +/- 1 degrees C and pH of 7.4 +/- 0.05. Field stimulation with parallel-plate silver electrodes was applied to study the twitch response of muscle samples. The peak tension and time course of isometric contraction of isolated muscle samples were measured electronically with a Cambridge Technology Dual Servo System (ergometer). Contraction time and 50% relaxation time of this muscle were measured for seven samples at various levels of strain. It was found that contraction time ranged between 22 and 32 ms and 50% relaxation time ranged between 17 and 37 ms. Results indicate that the vocalis muscle is a fast muscle capable of performing rapid maneuvers in support of changes in fundamental frequency.
通过一系列体外实验研究了犬类杓状肌的抽搐反应。在犬类死亡前几分钟，从其喉部解剖并制备杓状肌样本，将其保存在温度为37±1摄氏度、pH值为7.4±0.05的 Krebs 溶液中。使用平行板银电极进行场刺激，以研究肌肉样本的抽搐反应。用剑桥技术双伺服系统（测力计）以电子方式测量分离肌肉样本的等长收缩的峰值张力和时间进程。在不同应变水平下，对七个样本测量了该肌肉的收缩时间和50%松弛时间。发现收缩时间在22至32毫秒之间，50%松弛时间在17至37毫秒之间。结果表明，杓状肌是一种快速肌肉，能够进行快速运动以支持基频变化。
