Immediate Effects of Two Semi-occluded Vocal Tract Exercises on Laryngeal Activity of Individuals With Constant Vocal Effort
Overview
- Phase
- N/A
- Intervention
- Not specified
- Conditions
- Voice
- Sponsor
- Universidad Nacional de Colombia
- Enrollment
- 43
- Locations
- 1
- Primary Endpoint
- Contact quotient (CQ)
- Status
- Completed
- Last Updated
- 4 years ago
Overview
Brief Summary
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.
Detailed Description
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.
Investigators
Andres Fernando Delprado
Msc Physiology Student
Universidad Nacional de Colombia
Eligibility Criteria
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.
Outcomes
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.