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Changes in glottal area associated with increasing airflow

J A Sercarz1, G S Berke, S Bielamowicz

  • 1Division of Head and Neck Surgery, University of California, Los Angeles.

The Annals of Otology, Rhinology, and Laryngology
|February 1, 1994
PubMed
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Higher airflow during phonation increases glottal opening area, not vocal process contact. This study examined laryngeal resistance and airflow effects on glottal morphology in a canine model.

Area of Science:

  • Laryngology
  • Voice Production
  • Biomechanical Analysis

Background:

  • Laryngeal resistance typically decreases as airflow increases during phonation.
  • Understanding glottal morphological changes is crucial for voice production.
  • Previous research has not fully elucidated the relationship between airflow and glottal area dynamics.

Purpose of the Study:

  • To investigate the morphological adaptations of the glottis with increasing airflow and decreasing laryngeal resistance.
  • To quantify changes in glottal area during phonation under varying airflow conditions.

Main Methods:

  • Utilized an in vivo canine model for phonation studies.
  • Employed stroboscopic imaging and video analysis to assess glottal area changes.
  • Measured glottal dynamics using photoglottography, electroglottography, and subglottic pressure.

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Main Results:

  • Increasing airflow did not significantly alter the glottal chink (vocal process contact).
  • A notable increase in peak glottal opening area was observed with higher airflow.
  • The glottal area integral, a measure of overall glottal opening, also increased with airflow.

Conclusions:

  • Glottal morphology adapts to increased airflow by expanding opening area, not by altering vocal process contact.
  • These findings provide insights into the biomechanics of voice production at different airflow levels.
  • The study highlights the dynamic nature of the glottis in response to airflow variations.