The Effect of EMST and Triflo Devices on Acoustic and Aerodynamic Parameters of Sound and Sound Fatigue in Academics: A Randomized Controlled Study
Sponsor study identifier
interventional
40
1 country
1
Study Start
January 10, 2026
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Primary Completion
April 30, 2026
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Study Completion
May 10, 2026
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A healthy voice is essential for meeting professional and communicative demands, particularly for professional voice users such as academics, who are at increased risk of voice disorders due to prolonged and intensive voice use, unfavorable acoustic conditions, and stress. Voice disorders often result from inadequate respiratory support, leading to compensatory laryngeal overuse, vocal fatigue, and deterioration in voice quality. Although traditional voice therapy emphasizes diaphragmatic breathing, it does not enhance respiratory capacity because it lacks resistance. This study aims to investigate the effects of resistance-based breathing exercises using the Expiratory Muscle Strength Trainer (EMST 150) and triflo devices on respiratory capacity, acoustic and aerodynamic voice parameters, and vocal fatigue in academics. The findings are expected to contribute to the literature and support the use of EMST as a preventive and therapeutic approach for occupational groups at risk of voice disorders.
Registry-reported information. Elapsed time and enrollment totals alone do not measure study progress or recruitment pace.
May 10, 2026
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December 23, 2025
Actual (reported)January 10, 2026
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January 27, 2026
Actual (reported)April 30, 2026
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May 10, 2026
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Measurement of vocal fatigue
To assess vocal fatigue, participants will complete a vocal fatigue scale before starting the exercises. Participants will fill out this scale themselves. They will rate the parameters related to vocal fatigue on a scale of 0 to 4. Higher scores indicate greater fatigue. The validity and reliability of the vocal fatigue scale have been established in Turkish. Participants will be asked to complete this scale again in the 3rd week of the exercises and again in the 5th week, which is the final week of the exercises. They will also be asked to complete it again 2 months after the completion of the exercises for follow-up.
The study will continue for 4 months from the start of the study.
measurement of acoustic parameters of voice
In acoustic measurement, participants will have their measurements taken before starting the exercises.For acoustic parameters of the voice, jitter, shimmer, noise-harmonic ratio, and harmonic-noise ratio parameters will be measured by recording via the Multi-Dimensional Voice Program (MDVP). Furthermore, for acoustic parameters of the voice, the extra smooth cepstral peak prominence value and the Acoustic Voice Quality Index (AVQI) score will be calculated using Praat. These measurements will be repeated 3 weeks after the start of exercises, 5 weeks after the completion of exercises, and 2 months after the completion of exercises during follow-up.
triflo will be applied
EMST application will be performed.
EMST and Triflo applications will be carried out.
The TriFlo Breathing Exercise Device is scientifically designed to assist in performing breathing exercises that may be prescribed by doctors. This device increases participants' breath volume. Participants hold the device upright by its plastic parts and try to lift the balls upwards while inhaling. Alternatively, participants can invert the device by holding the plastic parts (the balls will fall down) and try to lift the balls upwards while exhaling. Participants will be asked to perform this exercise 5 days a week, 4 hours a day, in 3 sets of 10 exhalations and 10 inhalations.
İstanbul Medipol Üniversitesi- MEDKOM
Istanbul, Beykoz, Turkey (Türkiye)
eda Uzuner, phd candidate
Medipol University
First Submitted
December 23, 2025
First Posted
January 27, 2026
Study Start
January 10, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
EMST in Patients Undergoing CRT for HNCA
The study will continue for 4 months from the start of the study.
Aerodynamic measurement of the voice,
For the aerodynamic measurement of voice, participants will be asked to produce the sounds /s/ (measuring lung capacity), /z/ (vocal cord closure time), and /a/ (average sound production time), and the duration will be recorded. An s/z ratio close to 1 or between 1 and 1.3 is considered normal. For /a/ phonation, a normal adult is expected to produce sounds of 27-28 seconds. Participants' values will be recorded before the exercise, at the 3rd week of exercise, at the 5th week after the exercise, and again at 2 months post-exercise for follow-up.
The study will continue for 4 months from the start of the study.
EMST is a rehabilitation approach that uses a device to increase and activate the maximum pressure of the respiratory muscles. These muscles are important for powerful exhalation, coughing, and swallowing. EMST Week 1 Exercise Steps a. The participant is instructed to place the nasal plug on their nasal bone. b. The participant is asked to take a deep breath and not exhale. c. The participant is instructed to place the mouthpiece behind their teeth, inside their mouth, and press their lips firmly against the mouthpiece, pressing down on the sides of their cheeks if necessary. d. Participants are instructed to exhale forcefully and quickly, using their chest and abdominal muscles to push the air through the device. This exhalation effort should only take a few seconds for the air to pass. e. Participants are instructed to rest for at least 15-30 seconds, and to rest between breaths as well. The muscles need time to prepare for the next set. f. Participants repeat this exercise 5 times
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Primary Completion
April 30, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Study Completion
May 10, 2026
Estimated (date passed)This estimate has passed. The registry has not confirmed an actual date for this milestone.
Last Updated
January 27, 2026
Record last verified: 2026-01
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