Initial validation of an indirect measure of subglottal pressure during vowels

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Abstract
Some methods for direct measurement of subglottal pressure during speech are invasive and cannot be used on a routine basis. The development of noninvasive techniques is desirable, and a simple indirect method for measuring subglottal pressure from records of oral pressure during consonants was recently proposed and applied to studies of glottal resistance during phonation. To be useful, indirect measurement procedures should be validated by comparisons with direct measurements; the present procedure was designed for such a comparison. Miniature pressure transducers were used to obtain records of pressure below and above the glottis. Results showed nonsignificant differences and a high correlation between the direct and indirect measurements. This indirect method for measuring subglottal pressure thus appears to provide valid results.

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