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Tetanic contraction in vocal fold muscle
F Alipour-Haghighi1, I R Titze, A L Perlman
1University of Iowa, Iowa City.
Journal of Speech and Hearing Research
|June 1, 1989
Summary
Canine vocalis muscle exhibits increased tension with elongation and stimulation. Maximum tetanic contraction is significantly greater than twitch contraction, with fatigue decreasing passive tension.
Area of Science:
- Veterinary Science
- Muscle Physiology
- Biomechanics
Background:
- The vocalis muscle is crucial for vocalization in dogs.
- Understanding its active properties is essential for diagnosing and treating laryngeal dysfunction.
Purpose of the Study:
- To investigate the in vitro active properties of canine vocalis muscle.
- To characterize isometric and isotonic tetanic responses and their relationship with muscle strain and fatigue.
Main Methods:
- Experiments were conducted in vitro on canine vocalis muscle samples.
- Isometric and isotonic tetanic responses were measured using a Dual Servo System.
- Muscle fatigue and passive tension changes were assessed under repeated stimulation.
Main Results:
- Fused tetanus was observed at approximately 90 Hz, indicating force saturation.
- Maximum tetanic contraction was 6.4 times greater than maximum twitch contraction.
- Muscle elongation increased combined active and passive isometric tension; fatigue decreased passive tension.
Conclusions:
- Canine vocalis muscle exhibits robust active contractile properties in vitro.
- Muscle strain influences tetanic contraction period linearly, suggesting length-dependent activation.
- Fatigue significantly impacts muscle mechanics, highlighting the importance of recovery in vocal function.