Immediate Effects of Two Semi-occluded Vocal Tract Exercises

This study aims to observe the physiological effects of two different Semi-occluded vocal tract (SOVT) exercises in the larynx when they are executed by individuals with constant vocal effort and without vocal pathology.

Completed

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Key information

Conditions

Voice

Age range

25 year–45 year

Sex eligibility

Male

Study type

Observational

Primary location

Universidad Nacional de Colombia

Bogotá, 111321, Colombia

About this study

SOVT is a voice education or rehabilitation method that involves different postures which partially occlude or elongate the vocal tract. It causes a change in the vibration pattern of the vocal folds. SOVT postures have been postulated to produce changes in contact quotient (CQ), measured with electroglottograph (EGG). This study aims to observe the physiological effects of two different SOVT exercises in larynx when they are executed by people with constant vocal effort and without vocal pathology. In order to do so, EGG will be performed before and after 43 volunteers execute two SOVT exercises (tongue trill and resonance tubes). The following parameter will be captured: CQ. A t-paired test will be performed to compare pre and post-test information. Furthermore, a generalized estimating equation will be fit to find the effects of each exercise in the subjects.

This protocol was modified due to different administrative issues related to the use of the stroboscopy (one of the assesment tools previosly considered), so that stroboscopy was removed from the protocol.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

No current or past history of voice disorders.
No current or past voice training or therapy.
Vocal use larger than 20 hours per week.

Exclusion criteria

Laryngeal pathology during execution of stroboscopy.
Flu-like symptoms during measures.
Trouble with execution of semi-occluded vocal tract exercises.
Allergy to electrodes.

Treatment and study plan

Resonance tube

Other

Participants will phonate into a tube (10cm length 4mm inner diameter) during 5 minutes. They will produce series of the vowel /u/ into the tube. They will be asked to maintain the same pitch and loudness as they did in the baseline samples. They will be perceptually controlled by experimenters. When performing the exercise, the participants will be instructed to phonate with ease voice and to sense vibrations in the anterior face and the mouth.

Tongue trill

Other

Participants will produce series of a similar /r/ Spanish sound during 5 minutes. They will be asked to maintain the same pitch and loudness as they did in the baseline samples. They will be perceptually controlled by experimenters. When performing the exercise, the participants will be instructed to phonate with ease voice and to sense vibrations in the anterior face and the mouth.

Primary outcomes

Contact quotient (CQ)

Time frame: 1 hour

Improvement of vocal folds vibration pattern, demonstrated by a decrease of the mean CQ, measured with Electroglottography.

Sponsors and collaborators

Lead sponsor

Universidad Nacional de Colombia

Other

Registry information

Official study title

Immediate Effects of Two Semi-occluded Vocal Tract Exercises on Laryngeal Activity of Individuals With Constant Vocal Effort

Important dates

Study start: 2018
Primary completion: 2019
Study completion: 2019
First posted: Jan 29, 2018
Registry last updated: May 13, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed