Twitch Response in the Canine Vocalis Muscle 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 ± I°C and pH of 7.4 ... Research Article
Research Article  |   September 01, 1987
Twitch Response in the Canine Vocalis Muscle
 
Author Affiliations & Notes
  • Fariborz Alipour-Haghighi
    University of Iowa, Iowa City
  • Ingo R. Titze
    University of Iowa, Iowa City
  • Paul Durham
    University of Iowa, Iowa City
Article Information
Research Articles
Research Article   |   September 01, 1987
Twitch Response in the Canine Vocalis Muscle
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 290-294. doi:10.1044/jshr.3003.290
History: Received November 5, 1985 , Accepted December 3, 1986
 
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 290-294. doi:10.1044/jshr.3003.290
History: Received November 5, 1985; Accepted December 3, 1986

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 ± I°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.

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