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The Flow and Pressure Relationships in Different Tubes Commonly Used for Semi-occluded Vocal Tract Exercises
Pedro Amarante Andrade1, Greta Wistbacka2, Hans Larsson3
1Voice Research Lab, Department of Biophysics, Palacký University Olomouc, Olomouc, The Czech Republic.
Journal of Voice : Official Journal of the Voice Foundation
|April 16, 2015
Summary
Tube diameter significantly impacts vocal tract exercise back pressure more than length. Submerging tubes in water creates constant back pressure determined by depth, unlike thin tubes in air.
Area of Science:
- Acoustics
- Speech Science
- Biomedical Engineering
Background:
- Semi-occluded vocal tract exercises (SOVTE) are crucial for voice therapy.
- Understanding the physical properties of SOVTE devices is essential for optimizing their use.
Purpose of the Study:
- To investigate the relationship between back pressure (P(back)) and flow (U) for various tubes used in SOVTE.
- To compare the effects of tube dimensions (length, diameter) and submersion in water on P(back).
Main Methods:
- Experimental analysis of 10 tubes (8 straws, 1 resonance tube, 1 silicone tube) under varying conditions.
- Assessment of tubes with the free end in air and submerged in water (1-7 cm depth).
Main Results:
- Tube diameter had a greater impact on P(back) than tube length.
- Submerged tubes required overcoming hydrostatic pressure, resulting in near-constant P(back) irrespective of flow.
- Thin tubes in air showed significant P(back) changes with flow variations.
Conclusions:
- Tube dimensions and submersion significantly alter the P(back)-U relationship in SOVTE.
- Findings can inform the customization of SOVTE for specific therapeutic goals and patient needs.
- Optimizing device selection based on these physical properties may enhance therapy outcomes.
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