Investigation about the effect of VFEs on VF

Investigating the effect of Vocal Function Exercises on vocal fatigue in professional voice users

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

IRCT

Registry ID

IRCT20220116053728N1

Enrollment

Registered

2022-02-17

Start date

2022-04-03

Completion date

Unknown

Last updated

2022-03-08

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Condition 1: voice disorders. Condition 2: Vocal fatigue. Voice and resonance disorders Dysphonia

Interventions

Intervention 1: Intervention group: Participants in the intervention group will do VFEs practices. The VFEs is an organized vocal practice, structured as vocal pitch-based practice and designed in fou

Eligibility

Sex/Gender

All

Age

18 Years to 50 Years

Inclusion criteria

Inclusion criteria: The participant must work at least three days a week that directly contacts customers. The participant must have at least 1.5 hours of speaking on each working day. The participant should often use their maternal language to communicate with customers. The participant often uses a mask in the working environment.

Exclusion criteria

Exclusion criteria: The applicant has a history of neurological, respiratory, head and neck, pharyngeal/laryngeal, allergies, asthma, reflux, and/or hearing system diseases or surgeries. The applicant have a vocal training in the last six months ago.

Design outcomes

Primary

Measure	Time frame
Scores in the three sections of the vocal fatigue index (VFI). Timepoint: On the day of training and one day before the start of training (in the intervention group) or one day before the start of the 14 days in the control group (pre-term data); One day after completing the 14-day training period (in the intervention group) or the waiting period in the control group (post-term data). Method of measurement: Persian version of Vocal Fatigue Index.	—

Measure

Time frame

Scores in the three sections of the vocal fatigue index (VFI). Timepoint: On the day of training and one day before the start of training (in the intervention group) or one day before the start of the 14 days in the control group (pre-term data); One day after completing the 14-day training period (in the intervention group) or the waiting period in the control group (post-term data). Method of measurement: Persian version of Vocal Fatigue Index.

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Secondary

Measure	Time frame
Total score of the voice handicap index (VHI). Timepoint: On the day of training and one day before the start of training (in the intervention group) or one day before the start of the 14 days in the control group (pre-term data); One day after completing the 14-day training period (in the intervention group) or the waiting period in the control group (post-term data). Method of measurement: Persian version of Voice Handicap Index.	—

Measure

Time frame

Total score of the voice handicap index (VHI). Timepoint: On the day of training and one day before the start of training (in the intervention group) or one day before the start of the 14 days in the control group (pre-term data); One day after completing the 14-day training period (in the intervention group) or the waiting period in the control group (post-term data). Method of measurement: Persian version of Voice Handicap Index.

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Countries

Iran (Islamic Republic of)

Contacts

Public ContactMohammad Sedigh Mahmoudzadeh

Iran University of Medical Sciences

mmahmudzade.slps@gmail.com+98 21 2222 8051

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Feb 4, 2026