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Investigating the Three-dimensional Flow Separation Induced by a Model Vocal Fold Polyp
Published on: February 3, 2014
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Objective High-Speed Videoendoscopy Measures of Vocal Fold Vibration During Semi-Occluded Vocal Tract Exercise
David S Ford1, Stephanie R Zacharias2, Dimitar D Deliyski3
1Department of Speech-Language Pathology, John G. Rangos, Sr. School of Health Sciences, Duquesne University, Pittsburgh, PA.
Journal of Voice : Official Journal of the Voice Foundation
|February 27, 2025
Summary
Semi-occluded vocal tract (SOVT) exercises may lead to breathier vocal fold onsets, with less supraglottic squeezing during phonation. This study used high-speed videoendoscopy to directly image vocal fold vibration during SOVT tasks.
Area of Science:
- Laryngology
- Voice Science
- Speech Pathology
Background:
- Semi-occluded vocal tract (SOVT) exercises are widely used but lack direct kinematic data.
- Previous understanding relied on modeling and theoretical constructs.
Purpose of the Study:
- To investigate the impact of SOVT exercise on vocal fold vibratory characteristics.
- To obtain direct kinematic data using laryngeal imaging.
Main Methods:
- Exploratory study with two participants without voice disorders.
- Utilized transnasal flexible fiberoptic endoscopy with a high-speed videoendoscopy (HSV) system.
- Compared sustained vowel phonation with straw phonation (in air and water).
Main Results:
- SOVT exercises showed a trend toward longer glottal attack times, indicating breathier onsets.
- This effect was more pronounced with straw phonation into water.
- Supraglottic squeezing during phonation was absent during SOVT production.
Conclusions:
- Provides some of the first direct laryngeal imaging insights into vocal fold physiology during SOVT exercises.
- Highlights potential clinical significance for understanding SOVT exercise effects.
- Offers objective measures for high-speed videoendoscopy analysis in voice research.
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