Air-pressure characteristics and visualization of bubbling effect in water resistance therapy

0428257 - ÚT 2015 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Radolf, Vojtěch - Horáček, Jaromír - Bula, Vítězslav - Laukkanen, A. M.
Air-pressure characteristics and visualization of bubbling effect in water resistance therapy.
Engineering mechanics 2014. Brno: Brno University of Technology, 2014 - (Fuis, V.), s. 528-531. ISBN 978-80-214-4871-1. ISSN 1805-8248.
[Engineering Mechanics 2014 /20./. Svratka (CZ), 12.05.2014-15.05.2014]
Grant CEP: GA ČR GPP101/12/P579
Institucionální podpora: RVO:61388998
Klíčová slova: biomechanics of voice * phonation into tubes * voice therapy
Kód oboru RIV: BI - Akustika a kmity

This study investigates the influence of a widely used method in voice training and therapy, phonation into a resonance tube with the outer end submerged in water (‘water resistance therapy’ with bubbling effect). Acoustic and electroglottographic (EGG) signals and air pressures in the mouth cavity were registered and the formation of bubbles was studied using high speed camera. Bubbling frequency dominates in the spectra of the pressure signal being about 15 dB higher than the amplitude of the first harmonic, which reflects the fundamental frequency of the vocal folds’ vibration. Separation of the bubbles 10 cm under water surface starts when the buoyancy force acting on the bubble is approximately equal to the aerodynamic force in the tube.
Trvalý link: http://hdl.handle.net/11104/0239489