High-Speed Videoendoscopic and Acoustic Characteristics of Inspiratory Phonation

Abstract

Purpose: Given the importance of inspiratory phonation for assessment of vocal fold structure, the aim of this investigation was to evaluate and describe the vocal fold vibratory characteristics of inspiratory phonation using high-speed videoendoscopy in healthy volunteers. The study also examined the empirical relationship between cepstral peak prominence (CPP) and glottal area waveform measurements derived from simultaneous high-speed videoendoscopy and audio recordings. Method: Vocally healthy adults (33 women, 28 men) volunteered for this investigation and completed high-speed videoendoscopic assessment of vocal fold function for two trials of an expiratory/inspiratory phonation task at normal pitch and normal loudness. Twelve glottal area waveform measures and acoustic CPP values were extracted for analyses. Results: Inspiratory phonation resulted in shorter closing time, longer duration of the opening phase, and faster closing phase velocity compared to expiratory phonation. Sex differences were elucidated. CPP changes for inspiratory phonation were predicted by changes in the glottal area index and waveform symmetry index, whereas changes in CPP during expiratory phonation were predicted by changes in asymmetry quotient, glottal area index, and amplitude periodicity. Conclusions: Vocal fold vibratory differences were identified for inspiratory phonation when compared to expiratory phonation, the latter of which has been studied more extensively. This investigation provides important basic inspiratory phonation data to better understand laryngeal physiology in vivo and provides a basic model from which to further study inspiratory phonation in a larger population representing a broader age range. Supplemental Material: https://doi.org/10.23641/asha.22223812

Analyzing Vocal Fold Frequency Dynamics Using High‐Speed 3D Laser Video Endoscopy

“…Along the superior surface, the mean and maximum closing velocities were greater posteriorly for low pitch. Current standard-of-care endoscopic assessments either visual-perceptual 3,35,36 or quantitative 34,37,38 do not take into account the vertical motion. Conducting further experiments with varying loudness and with voice disorders, both using in vivo 3D laser endoscopy and biomechanical modeling studies could provide a more detailed understanding of the clinical significance of evaluating the vertical motion for pitch and loudness changes.…”