Deconstructing Voice Therapy: Towards Enhanced Communication Outcomes

Overview

This research study aims to evaluate the effect of treatment delivery method on voice outcomes over 12 months in people with a primary complaint of a voice problem, diagnosed with either non-phonotraumatic vocal hyperfunction, also known as primary muscle tension dysphonia (MTD) or phonotraumatic vocal hyperfunction, also known as benign vocal fold lesions (lesions). The secondary objectives are: * To evaluate acoustic correlates of clear speech and the relationship to vocal acoustic and patient-reported voice outcomes. * To determine the association between overall dysphonia outcomes and adoption of clear speech.

Detailed description

About 23 million Americans-roughly 1 in 13 people-suffer from voice problems at any given time. These issues can make it hard to speak clearly, lead to throat pain or fatigue, and affect daily life, work, and emotional well-being. The two most common types of voice problems are:

* Muscle tension dysphonia (MTD): when muscles in the throat are too tight during speaking. * Benign vocal fold lesions: such as nodules or swelling on the vocal cords due to overuse or strain.

The most common treatment for these conditions is behavioral voice therapy, which involves working with a speech-language pathologist (SLP) to learn new ways to use the voice. However, over a third of patients drop out, and long-term success is uncertain. One major challenge is helping patients apply what they learn in therapy to their real-life conversations-a step often saved for the end of treatment or skipped entirely.

Traditional voice therapies often follow a strict step-by-step ("hierarchical") approach. Patients start with basic sounds or exercises and only work up to everyday speech later. But this method may not be the most effective, and many people struggle to use the new techniques outside the clinic.

To solve this problem, the research team developed a new method called Conversation Training Therapy (CTT). CTT flips the traditional approach: it begins with practicing clear, intentional speech in real conversation from the first session. This helps patients immediately apply new voice skills in real-life situations, which may lead to faster, more lasting results.

Studies have shown that CTT leads to meaningful improvements in voice-related quality of life both immediately and up to three months after therapy. It is now being used in national research studies and has gained recognition as a promising, evidence-based therapy. The current research will compare CTT to traditional methods over a full year, helping to answer important questions about what makes voice therapy work-and how to help more people benefit from it long-term.

Interventions

• Other Hierarchical method
  Participants in the hierarchical version of Conversation Training Therapy (CTTH) will receive four weekly sessions of voice therapy. This approach gradually increases the difficulty of speaking tasks-from simple sounds to full conversations-based on the participant's progress. The therapy begins with basic awareness and speech sounds (e.g., consonant-vowel pairs), then progresses through words, phrases, and sentences, culminating in natural conversation. Each level must be completed with at leas
• Other Non Hierarchical method
  The therapy includes four weekly sessions and several key techniques: Clear Speech: Speaking clearly, like leaving an important voicemail. Awareness Training: Paying attention to how the voice sounds and feels in the mouth and face. Negative Practice: Switching between their "bad" voice and "good" therapy voice to recognize and improve differences. Embedded Gestures: Briefly holding certain speech sounds to reduce vocal strain and boost clarity. Prosody and Projection: Working on pitch, rhy

Primary outcome measures

• Change in Voice Handicap Index-10 (VHI-10) score [Time frame: During intervention (4 week period of active treatment: Week 1, Week 2, Week 3, Week 4) immediately post treatment ( week 5), 3month, 6 month and 12-months post treatment]
• Change in vowel space [Time frame: During intervention (4 week period of active treatment: Week 1, Week 2, Week 3, Week 4) immediately post treatment ( week 5), 3month, 6 month and 12-months post treatment.]

Secondary outcome measures (12)

• Auditory- Perceptual severity [Time frame: Baseline , 3 month, 6 month, 12 month]
• Stroboscopic changes: Glottal Closure [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Stroboscopic changes: Amplitude [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Stroboscopic changes: Mucosal Wave [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Stroboscopic changes: Free edge contour [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Stroboscopic changes: Phase closure [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Stroboscopic changes: Phase symmetry [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Stroboscopic changes: Regularity percentage [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Aerodynamic changes: Average airflow in speech [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Aerodynamic changes: Average number of breaths [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Aerodynamic changes: Average speaking duration [Time frame: Baseline, Post intervention (1 week), 3 month, 6 month, 12 month]
• Adherence [Time frame: Baseline, end of study (12 month)]

Eligibility criteria

Inclusion criteria

• Non-smoking
• Diagnosis of either primary muscle tension dysphonia of the hyperadducted type or benign vocal fold lesions.
• No neuro-laryngologic or age-related vocal fold changes (e.g., atrophy)
• No history of voice therapy or voice surgery in the last year
• No history of other serious chronic medical conditions that may affect voice (per patient report), Normal hearing (determined by pure tone audiometry), stimulable and appropriate for behavioral voice intervention as determined by a voice-specialized speech-language pathologist and laryngologist,
• Willingness to attend all therapeutic interventions and follow-up sessions
• Willingness to use a smartphone to record practice

Exclusion criteria

• History of voice therapy or voice surgery in the last year
• Serious chronic medical condition that may affect voice (per patient report)
• Abnormal hearing ability (despite appropriate amplification)
• Other laryngeal disorders not attributed to primary MTD and benign vocal fold lesions,
• Not stimulable or inappropriate for behavioral voice intervention as determined by a voice-specialized speech-language pathologist and laryngologist
• Unwillingness to attend therapeutic intervention and follow-up sessions
• Unwillingness to use a smartphone to record practice
• Pregnant women
• Prisoners
• Cognitive impairment or impaired decision-making capacity

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

Randomized

Model

Parallel assignment

Masking

Open label

Primary purpose

Treatment

Study locations

United States · 1 center

• Emory Voice Center at Emory University Hospital Midtown — Atlanta

Identifiers

NCT: NCT07176988 · STUDY00009121 · 1R01DC022026-01A1

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗