How much loading does the water resistance therapy pose on the vocal folds?

0480181 - ÚT 2018 HK eng A - Abstract
Laukkanen, A.M. - Geneid, A. - Bula, Vítězslav - Radolf, Vojtěch - Horáček, Jaromír
How much loading does the water resistance therapy pose on the vocal folds?
AQL 2017 The 12th International Conference on advances in quantitative laryngology, voice and speech research. Hong Kong, 2017 - (Ma, E.; Yiu, E.). s. 1
[AQL 2017 The 12th International Conference on Advances in Quantitative Laryngology, Voice and Speech research. 17.10.2017-21.10.2017, Hong Kong]
R&D Projects: GA ČR(CZ) GA16-01246S
Institutional support: RVO:61388998
Keywords : biomechanics of voice * impact stress measurement * glottal opening measurement * measurement of pre-collision velocity of vocal folds
Subject RIV: BI - Acoustics

A male participant sustained a rounded back vowel [u:] or [o:] at a comfortable pitch and loudness, and phonated into a silicone "Lax vox" tube submerged 2 cm in water. High speed laryngoscopy was performed with a rigid scope. Oral airpressure (Poral) was registered in mouthpiece through which the endoscope was inserted in the larynx. EGG was recored. Results of the participant were compared with those from a physical model of phonation, consisting of silicone vocal folds, and a plexiglas vocal tract in the setting for [u:].
CQ increased, both derived from EGG and glottal area, while negative glottal area derivative and NAQ (from area) decreased for phonation into water. Results from modelling were in line with those obtained from human.
Water resistance therapy does not seem to increase vocal fold loading even if CQ increase and NAQ decrease suggest a more pressed phonation. CQ from EGG corresponds to that of area, but CQ does not seem to be a reliable estimate of impact stress.
Permanent Link: http://hdl.handle.net/11104/0276465