The Effects of Hyper- and Hypocapnia on Phonatory Laryngeal Airway Resistance in Women

Journal of Speech, Language, and Hearing Research : JSLHR
Amanda I GillespieKatherine Verdolini Abbott

Abstract

The larynx has a dual role in the regulation of gas flow into and out of the lungs while also establishing resistance required for vocal fold vibration. This study assessed reciprocal relations between phonatory functions-specifically, phonatory laryngeal airway resistance (Rlaw)-and respiratory homeostasis during states of ventilatory gas perturbations. Twenty-four healthy women performed phonatory tasks while exposed to induced hypercapnia (high CO2), hypocapnia (low CO2), and normal breathing (eupnea). Effects of gas perturbations on Rlaw were investigated as were the reciprocal effects of Rlaw modulations on respiratory homeostasis. Rlaw remained stable despite manipulations of inspired gas concentrations. In contrast, end-tidal CO2 levels increased significantly during all phonatory tasks. Thus, for the conditions tested, Rlaw did not adjust to accommodate ventilatory needs as predicted. Rather, stable Rlaw was spontaneously accomplished at the cost of those needs. Findings provide support for a theory of regulation wherein Rlaw may be a control parameter in phonation. Results also provide insight into the influence of phonation on respiration. The work sets the foundation for future studies on laryngeal function during ph...Continue Reading

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Citations

Jul 11, 2019·Journal of Speech, Language, and Hearing Research : JSLHR·Aaron ZieglerKatherine Verdolini Abbott
Apr 6, 2019·Journal of Speech, Language, and Hearing Research : JSLHR·Daniel J CroakeJoseph C Stemple
Jan 15, 2020·Journal of Voice : Official Journal of the Voice Foundation·Michael A BelskyJackie L Gartner-Schmidt

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