Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5124165 | Journal of Voice | 2017 | 8 Pages |
SummaryObjectiveThis study compares the flow resistance of Resonance tube (RT) and Lax Vox tube (LVT) when submerged 2âcm and 10âcm in water, as well as phonation into the tubes in these conditions.MethodsIn the in vitro experiment, the air pressure for flow rates of 60-600âmL/s was measured at the tube inlet, when the outer end of the tube was submerged 2âcm and 10âcm below water surface in 30°, 45°, and 90° angle. In the in vivo experiment, 14 subjects phonated in habitual loudness and loudly into both tubes, with the outer end 2âcm and 10âcm in water. RT was immersed in a 45° angle and LVT in a 90° angle in water. Oral pressure, contact quotient from electroglottographic signal, and sound pressure level were studied. Sensations during phonation were reported in an interview.ResultsFlow 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 2âcm in water. Some subjects preferred RT, whereas others preferred LVT or reported no differences between them.ConclusionsThe tubes differed slightly in flow resistance. Higher oral pressure oscillation with LVT 2âcm in water may offer stronger massage effect on vocal folds.