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Completed

NCT Number: NCT07677501

Combined SOVT and Respiratory Exercises: Effects on MPT and Respiratory Function

This study aims to investigate the effects of combined SOVT and breathing exercises, administered twice weekly for six weeks to conservatory students, through a randomized controlled trial. The study has two hypotheses: H1: Combined SOVT and breathing exercises increase the maximum phonation duration. H2: Combined SOVT and breathing exercises improve spirometric parameters (FEV₁, FVC, FEV₁/FVC, and PEF).

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Key information

Age range

18 year–35 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Hasan Kalyoncu University

Gaziantep, 27000, Turkey (Türkiye)

About this study

This study aims to investigate the effects of combined SOVT and breathing exercises, applied twice a week for 6 weeks, on conservatory students at Gaziantep University through a randomized controlled trial. The study has two hypotheses: H1: Combined SOVT and breathing exercises increase maximum phonation duration. H2: Combined SOVT and breathing exercises improve spirometric parameters (FEV₁, FVC, FEV₁/FVC, and PEF). In the intervention group, phonation exercises using a pipette were taught and practiced as part of the SOVT exercise. Simultaneously, pursed-lip breathing, segmental breathing, and diaphragmatic breathing exercises were taught and practiced as breathing exercises. At the end of 6 weeks, the maximum phonation duration of all participants was measured with a stopwatch. Additionally, spirometric parameters were measured using a spirometer.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • Being between 18 and 35 years of age
  • Being an undergraduate student studying vocal training at a state conservatory
  • Volunteering to actively participate in the research process and signing the written consent form

Exclusion criteria

  • • Having been diagnosed with any voice disorder (e.g., nodule, polyp, laryngitis, dysphonia, etc.)
  • Having received voice therapy, voice surgery, or respiratory physiotherapy in the past
  • Having an acute or chronic respiratory disease (e.g., asthma, COPD, bronchitis)
  • Participants who have had an upper respiratory tract infection in the last two weeks
  • Participants with a neurological, psychiatric, or cardiopulmonary system diagnosis
  • Participants who declare that they cannot regularly attend the exercise protocol

Treatment and study plan

combined soft and breathing exercises

Other

The intervention group underwent combined sovt and breathing exercises. Sovt exercises consisted of phonation exercises using a pipette. Breathing exercises consisted of pursed-lip breathing, segmental breathing, and diaphragmatic breathing exercises.

Primary outcomes

  1. Voice Handicap Index (VHI-10)

    Time frame: 6 weeks

    The Voice Handicap Index (VHI) will be used to assess participants' self-perceived voice-related handicap. The questionnaire consists of items evaluating the functional, physical, and emotional impact of voice problems. Total scores range from 0 to 40, with higher scores indicating greater perceived voice handicap.

Secondary outcomes

  1. Maximum Phonation Time (MPT)

    Time frame: 6 weeks

    Maximum Phonation Time (MPT) will be assessed by asking participants to sustain the vowel /a/ after a maximal inhalation at a comfortable pitch and loudness. Three trials will be performed with adequate rest between trials, and the longest duration recorded in seconds will be used for analysis.

Other outcomes

  1. Forced Vital Capacity (FVC)

    Time frame: 6 weeks

    Forced vital capacity (FVC, L) will be assessed using spirometry according to ATS/ERS recommendations. Participants will perform at least three acceptable forced expiratory maneuvers, and the highest value in liters will be recorded for analysis.

  2. Forced Expiratory Volume in 1 Second (FEV₁)

    Time frame: 6 weeks

    Forced expiratory volume in one second (FEV₁, L) will be assessed using spirometry according to ATS/ERS recommendations. The highest value obtained from at least three acceptable maneuvers will be used for analysis.

  3. FEV₁/FVC Ratio

    Time frame: 6 weeks

    The FEV₁/FVC ratio (%) will be calculated from spirometric measurements obtained according to ATS/ERS recommendations. The highest acceptable values will be used for analysis.

  4. Peak Expiratory Flow (PEF)

    Time frame: 6 weeks

    Peak expiratory flow (PEF, L/min) will be assessed using spirometry according to ATS/ERS recommendations. The highest value obtained from at least three acceptable maneuvers will be recorded for analysis.

Sponsors and collaborators

Lead sponsor

Hasan Kalyoncu University

Other

Registry information

Official study title

Effects of Combined Semi-Occluded Vocal Tract (SOVT) and Respiratory Exercises on Maximum Phonation Time (MPT) and Respiratory Function in Conservatory Students Across Different Academic Years

Important dates

Study start
2025
Primary completion
2025
Study completion
2026
First posted
Jun 30, 2026
Registry last updated
Jun 30, 2026

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.

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