How Much Loading Does Water Resistance Voice Therapy Impose on the Vocal Folds? An Experimental Human Study

0496969 - ÚT 2021 RIV US eng J - Journal Article
Laukkanen, A. M. - Geneid, A. - Bula, Vítězslav - Radolf, Vojtěch - Horáček, Jaromír - Ikävalko, T. - Kukkonen, T. - Kankare, E. - Tyrmi, J.
How Much Loading Does Water Resistance Voice Therapy Impose on the Vocal Folds? An Experimental Human Study.
Journal of Voice. Roč. 34, č. 3 (2020), s. 387-397. ISSN 0892-1997. E-ISSN 1873-4588
R&D Projects: GA ČR(CZ) GA16-01246S
Institutional support: RVO:61388998
Keywords : voice therapy * biomechanics * impact stress * high speed imaging
OECD category: Acoustics
Impact factor: 2.009, year: 2020
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0892199718303709?via%3Dihub

Water resistance voice therapy applies phonation in to water through a tube. This study investigates how strenuous this therapy can be for the vocal folds in terms of impactstress (IS). It further examines whether it is possible to estimate the IS using the contact quotient (CQ) and maximum derivative from an electroglottogram (EGG). A male participant sustained a rounded back vowel [u:] or [o:] at a comfortable speaking pitch and loudness, and phonated into a silicone ´LaxVox´ tube submerged 2 cm in water. High-speed video laryngoscopy was performed with a rigid scope. Oral air pressure (Poral) was registered in a mouth piece through which an endo-scope was inserted into the larynx. An EGG was recorded.
The CQ EGG from the EGG and the closed quotient from the glottal width (CQarea) increased, while the maximum glottal amplitude and absolute value of derivative minimum (dmin) and also the derivative maximum from the EGG decreased for phonation into water. Normalized amplitude quotient from the glottal width variational so decreased but the change was not significant. Based on the glottal a reafindings, water resistance therapy does not seem to increase vocal fold loading (in terms of increased IS) even if the increase of CQ area, and CQ EGG suggest so. CQ EGG may qualitatively correspond to that of area, but the reliability of CQ (from the glottal area or the EGG) and the maximum derivative from the EGG as estimates of IS in semi occlusion exercises warrant further studies.
Permanent Link: http://hdl.handle.net/11104/0309808