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Related Experiment Video

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Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

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Vocal function exercises for normal voice: With and without semi-occlusion.

Maria Bane¹, Megan Brown¹, Vrushali Angadi¹

¹a Department of Rehabilitation Sciences, University of Kentucky , Lexington , KY , USA.

International Journal of Speech-Language Pathology

|April 5, 2018

Summary

Modifying vocal tract (VT) posture during Vocal Function Exercises (VFEs) slightly impacts maximum phonation time (MPT) goals. Reduced VT occlusion during VFEs may lessen MPT gains, suggesting caution with modifications.

Keywords:

efficacy maximum phonation time semi-occluded vocal tract

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Area of Science:

Speech and Hearing Sciences
Voice Science
Vocal Pedagogy

Background:

Vocal Function Exercises (VFEs) are commonly used to improve voice production.
Semi-occluded vocal tract (SOVT) postures are integral to VFE efficacy.
Understanding the impact of SOVT modifications is crucial for clinical application.

Purpose of the Study:

To investigate how varying degrees of vocal tract occlusion during VFEs affect maximum phonation time (MPT) in individuals with normal voices.
To determine if SOVT postures in VFEs can be modified without compromising their effectiveness.
To explore the relationship between VT occlusion and MPT attainment.

Main Methods:

A pre-post longitudinal study involving 26 females aged 18-30.
Participants were randomly assigned to three groups performing VFEs with either a prescribed SOVT posture, the vowel /o/, or the vowel /a/.
The primary outcome measure was MPT achieved during the VFE tasks.

Main Results:

A statistically significant improvement in MPT was observed in the group using the prescribed SOVT posture.
The groups performing VFEs with modified postures (/o/ or /a/) did not show significant improvements in MPT.
These findings suggest a dose-dependent relationship between VT occlusion and MPT gains.

Conclusions:

The SOVT posture in VFEs can be modified to a limited extent without substantially reducing efficacy.
Reduced vocal tract occlusion during VFEs may lead to less robust improvements in MPT.
Further research is recommended to validate these findings in clinical populations.