Vocal Fold Kinematics and Convergent-Divergent Oscillatory Glottis: Basic Insights Using Mucosal Wave Modelling and Synthetic Kymograms

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73630739" target="_blank" >RIV/61989592:15310/25:73630739 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1044/2024_JSLHR-24-00251" target="_blank" >https://doi.org/10.1044/2024_JSLHR-24-00251</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1044/2024_JSLHR-24-00251" target="_blank" >10.1044/2024_JSLHR-24-00251</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Vocal Fold Kinematics and Convergent-Divergent Oscillatory Glottis: Basic Insights Using Mucosal Wave Modelling and Synthetic Kymograms

Popis výsledku v původním jazyce

Purpose: Owing to mucosal waves, the oscillatory glottis is ideally expected to be convergent during opening and divergent during closing. However, this does not necessarily hold for voice disorders. Here, we pave the way for recognizing COnvergent-DIvergent (CODI) waveforms quantitatively and study the kinematic conditions in which they occur. Method: We simulated 3,125 laryngoscopic glottal waveforms using a kinematic vocal fold (VF) model and synthetic kymograms. We independently varied the oscillatory amplitudes of the upper and lower VF margins, Au and AL (0.1 to 1.1 mm), vertical phase difference (VPD; 0 degrees to 125 degrees), glottal halfwidth HW (-0.05 to 1.2 mm), and prephonatory glottal convergence angle 1IJCVG (-15 degrees to 35 degrees) to simulate normal and disordered conditions. We introduced the upper and lower margin quotients, Qu and QL, quantifying the proportion of time when the upper margin is at the glottal edge during the opening, and when the lower margin is at the glottal edge during the closing, respectively. A CODI waveform was defined as the case when Qu = QL =1. Results: The likelihood of obtaining the CODI waveform was highest when Au and AL were similar, 1IJCVG was close to 0, HW was below 0.45 mm, and VPD was larger than 50 degrees. In 88% of the simulated cases, the waveforms did not fulfill the CODI conditions. In these cases, either the lower margin was hidden during some portion of the closing phase or the upper margin was not at the glottal edge during some portion of the opening phase. Conclusion: The study provides the basis for a better understanding of the variability of glottal waveforms and the appearance of mucosal waves related to VF kinematics.

Název v anglickém jazyce

Vocal Fold Kinematics and Convergent-Divergent Oscillatory Glottis: Basic Insights Using Mucosal Wave Modelling and Synthetic Kymograms

Popis výsledku anglicky

Purpose: Owing to mucosal waves, the oscillatory glottis is ideally expected to be convergent during opening and divergent during closing. However, this does not necessarily hold for voice disorders. Here, we pave the way for recognizing COnvergent-DIvergent (CODI) waveforms quantitatively and study the kinematic conditions in which they occur. Method: We simulated 3,125 laryngoscopic glottal waveforms using a kinematic vocal fold (VF) model and synthetic kymograms. We independently varied the oscillatory amplitudes of the upper and lower VF margins, Au and AL (0.1 to 1.1 mm), vertical phase difference (VPD; 0 degrees to 125 degrees), glottal halfwidth HW (-0.05 to 1.2 mm), and prephonatory glottal convergence angle 1IJCVG (-15 degrees to 35 degrees) to simulate normal and disordered conditions. We introduced the upper and lower margin quotients, Qu and QL, quantifying the proportion of time when the upper margin is at the glottal edge during the opening, and when the lower margin is at the glottal edge during the closing, respectively. A CODI waveform was defined as the case when Qu = QL =1. Results: The likelihood of obtaining the CODI waveform was highest when Au and AL were similar, 1IJCVG was close to 0, HW was below 0.45 mm, and VPD was larger than 50 degrees. In 88% of the simulated cases, the waveforms did not fulfill the CODI conditions. In these cases, either the lower margin was hidden during some portion of the closing phase or the upper margin was not at the glottal edge during some portion of the opening phase. Conclusion: The study provides the basis for a better understanding of the variability of glottal waveforms and the appearance of mucosal waves related to VF kinematics.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10610 - Biophysics

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF SPEECH LANGUAGE AND HEARING RESEARCH

ISSN

1092-4388

e-ISSN

1558-9102

Svazek periodika

68

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

1602-1617

Kód UT WoS článku

001466466900001

EID výsledku v databázi Scopus

2-s2.0-105003195919