The Flow and Pressure Relationships in Different Tubes Commonly Used for Semi-occluded Vocal Tract Exercises

Andrade, Pedro Amarante, Wistbacka, Greta, Larsson, Hans, Södersten, Maria, Hammarberg, Britta, Simberg, Susanna, Švec, Jan G. and Granqvist, Svante (2015) The Flow and Pressure Relationships in Different Tubes Commonly Used for Semi-occluded Vocal Tract Exercises. Journal of Voice, 30 (1). pp. 36-41. ISSN 08921997

The flow and pressure relationships in different tubes commonly used for semioccluded vocal tract exercises.pdf - Accepted Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (570kB) | Preview


This experimental study investigated the back pressure (pback) versus flow (U) relationship for 10 different tubes commonly used for semi-occluded vocal tract exercises (SOVTE), i.e., 8 straws of different lengths and diameters, a resonance tube and a silicone tube similar to a Lax Vox tube. All tubes were assessed with the free end in air. The resonance tube and silicone tube were further assessed with the free end under water at the depths from 1 to 7 cm in steps of 1 cm. The results showed that relative changes in the diameter of straws affect pback considerably more compared to the same amount of relative change in length. Additionally, once tubes are submerged into water, pback needs to overcome the pressure generated by the water depth before flow can start. Under this condition, only a small increase in pback was observed as the flow was increased. Therefore, the wider tubes submerged into water produced an almost constant pback determined by the water depth, while the thinner straws in air produced relatively large changes to pback as flow was changed. These differences may be taken advantage of when customizing exercises for different users and diagnoses and optimizing the therapy outcome.

Item Type: Article
Keywords: semi-occluded vocal tract exercises, straw, resonance tube, Lax Vox tube, voice therapy, flow, pressure, back pressure.
Divisions: ?? UniversityCollegePlymouthMarkJohn ??
Depositing User: Users 134 not found.
Date Deposited: 23 Jan 2017 17:41
Last Modified: 14 Feb 2020 14:04
Related URLs: https://www.sci ... 0156?via%3Dihub (Publisher URL)

Actions (login required)

Edit Item Edit Item