Resonance Tube or Lax Vox?

0469140 - ÚT 2018 RIV US eng J - Článek v odborném periodiku
Tyrmi, J. - Radolf, Vojtěch - Horáček, Jaromír - Laukkanen, A. M.
Resonance Tube or Lax Vox?
Journal of Voice. Roč. 31, č. 4 (2017), s. 430-437. ISSN 0892-1997. E-ISSN 1873-4588
Grant CEP: GA ČR GA16-01246S
Institucionální podpora: RVO:61388998
Klíčová slova: flow resistance * EGG * voice therapy * water resistance therapy * air pressure in phonation
Obor OECD: Acoustics
Impakt faktor: 1.381, rok: 2016

Objective. This study compares the flow resistance of Resonance tube (RT) and Lax Vox tube (LVT) when submerged 2 cm and 10 cm in water, as well as phonation into the tubes in these conditions.
Methods. In the in vitro experiment, the air pressure for flow rates of 60-600 mL/s was measured at the tube inlet, when the outer end of the tube was submerged 2 cm and 10 cm below water surface in 30 degrees, 45 degrees, and 90 degrees angle. In the in vivo experiment, 14 subjects phonated in habitual loudness and loudly into both tubes, with the outer end 2 cm and 10 cm in water. RT was immersed in a 45 degrees angle and LVT in a 90 degrees angle in water. Oral pressure, contact quotient from electroglottographic signal, and sound pressure level were studied. Sensations during phonation were reported in an interview.
Results. Flow resistance was slightly lower with LVT than with RT, and slightly lower for smaller immersion angles. In habitual loudness, transglottic pressure and frequency of oral pressure variation were lower for LVT phonation and amplitude of oral pressure variation was higher for LVT 2 cm in water. Some subjects preferred RT, whereas others preferred LVT or reported no differences between them.
Conclusions. The tubes differed slightly in flow resistance. Higher oral pressure oscillation with LVT 2 cm in water may offer stronger massage effect on vocal folds.
Trvalý link: http://hdl.handle.net/11104/0273087