Abstract
Although theoretical studies include a term for gas density in their mathematical descriptions of glottal aerodynamics, there are no studies that have measured the effect of gas density on glottal vibration. This study used an in vivo canine model to evaluate the effect of gas density on glottal vibration by comparing phonation with air and helium. Phonation with helium at a constant flow rate resulted in an increased exit jet particle velocity, and an increased open phase, compared to phonation with air. Phonation with helium also resulted in a decrease in maximum glottal width, glottal area per period, frequency, and subglottic pressure when compared to phonation with air. These results were compared to those obtained with air and helium in a four‐mass computer model of phonation.
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