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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

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Official URL: http://doi.org/10.1016/j.jvoice.2015.02.004

Abstract

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: Mrs Wendy Evans
Date Deposited: 23 Jan 2017 17:41
Last Modified: 23 May 2019 09:27
URI: http://marjon.collections.crest.ac.uk/id/eprint/10214

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