2008
DOI: 10.1177/000348940811700714
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Phonation Threshold Flow in Elongated Excised Larynges

Abstract: Objectives-This study proposes the use of a new parameter of vocal aerodynamics, phonation threshold flow (PTF). The sensitivity of PTF and phonation threshold pressure (PTP) were quantitatively compared to the percent of vocal fold elongation from physiologic length.Methods-Ten excised canine larynges were mounted on a bench apparatus capable of controlling vocal fold elongation. Subglottal airflow was gradually increased until the onset of phonation. Elongation of the vocal folds was varied from +0% (physiol… Show more

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Cited by 16 publications
(16 citation statements)
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“…A more relaxed habitual glottal behaviour can sometimes result in a slightly lowered speaking pitch, especially in women suffering from hyperfunctional dysphonia who are undergoing voice therapy. This clinical experience is in accordance with the theoretical framework that the required PTP is somewhat lowered by a (Jiang et al, 2008;Zhang et al, 2007). Again, in the case of a thickened vocal fold mucosa, it seems rational to assume, that if the vocal folds are not stretched, but rather the increased mass are 'allowed' to oscillate relaxed, occasions of damped oscillation can be prevented but this will be at the cost of vibration at a lower rate.…”
Section: Discussionsupporting
confidence: 80%
See 1 more Smart Citation
“…A more relaxed habitual glottal behaviour can sometimes result in a slightly lowered speaking pitch, especially in women suffering from hyperfunctional dysphonia who are undergoing voice therapy. This clinical experience is in accordance with the theoretical framework that the required PTP is somewhat lowered by a (Jiang et al, 2008;Zhang et al, 2007). Again, in the case of a thickened vocal fold mucosa, it seems rational to assume, that if the vocal folds are not stretched, but rather the increased mass are 'allowed' to oscillate relaxed, occasions of damped oscillation can be prevented but this will be at the cost of vibration at a lower rate.…”
Section: Discussionsupporting
confidence: 80%
“…Also fundamental frequency has been shown to vary systematically with PTP; the higher the F0, i.e. the more stretched vocal folds, the higher pressure is required to initiate vocal fold oscillation (Jiang, Regner, Tao, & Pauls, 2008;Zhang, Reynders, Jiang, & Tateya, 2007). So, intermittent aphonia as a perceptual phenomenon seems closely related to an insufficient degree of subglottal pressure to initiate vocal fold oscillation in cases of increased PTP.…”
mentioning
confidence: 99%
“…found a significant correlation between PTF and vocal fold elongation [74]. No statistically significant relationship was found between the size of larynx and the measured PTF.…”
Section: Excised Human and Animal Larynx Experimentsmentioning
confidence: 99%
“…When a polyp or nodule is present, the glottal closure is limited, thus increasing air leakage during phonation and resulting in higher-than-normal airflow measurements. 12 Previous experiments using excised canine larynges have shown PTF to increase with the size of a posterior glottal gap, 13 vocal fold elongation, 14 and surface dehydration. 15 Hottinger et al 13 determined that PTF is more sensitive than PTP to changes in posterior glottal width, demonstrating the potential value of the flow parameter in evaluating disorders that are characterized by glottal insufficiency.…”
Section: Introductionmentioning
confidence: 99%