Laryngeal airway resistance as a function of phonation type

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Abstract
An indirect method to estimate laryngeal airway resistance was investigated. The ratio of the intraoral pressure (IOP) for the voiceless stop and the volume velocity air flow (V0) for the open vowel in the CV utterance /pa/ was suggested to give an estimate of the laryngeal airway resistance (Rlaw); Rlaw = IOP/V0. The primary variable was phonation type. It was hypothesized that the Rlaw value would reflect the laryngeal airway resistance during: (1) normal, (2) pressed, and (3) breathy phonation. Other controlled variables were intensity and fundamental frequency. The results suggested that the Rlaw value was highest for pressed phonation and lowest for breathy phonation irrespective of intensity and fundamental frequency. Good discrimination in the Rlaw value between high and low intensity was also found. These results were interpreted to give evidence that the Rlaw value obtained with this method was a good index of actual resistance.

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