Relationships Between Vocal Fold Adduction Patterns, Vocal Acoustic Quality, and Vocal Effort in Individuals With and Without Hyperfunctional Voice Disorders.
Caroline Crocker, Laura E Toles, Robert A Morrison and 1 others
PMID 38195336WHAT IT FOUND
The video measure of vocal fold squeeze did not separate people with muscle tension dysphonia or vocal fold lesions from healthy controls.
Both groups reported more effort, and muscle tension dysphonia had lower voice quality. Squeeze alone did not explain effort.
Key findings
01Automated peak vocal fold adduction velocities and anterior glottic angles did not significantly differ between voice-disorder groups and controls.
02People with pMTD or vocal fold lesions reported higher vocal effort than controls, with no difference between the two clinical groups.
03Vocal fold adduction did not correlate with acoustic quality or vocal effort; only CPP and H1-H2 were negatively correlated in pMTD.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
Only 20 people were in each group, and the authors say the design may have been underpowered for heterogeneous voice disorders and lesion types. Laryngoscopy was recorded at 30 frames per second, which the authors note may be too slow to capture fast vocal fold adduction accurately. The study looked at sustained /i/ vowels and voice onsets, not connected speech or steady-state productions, so it may miss everyday voice behaviors. Benign lesion size and type were not stratified, and averaging across lesions could mask differences. The control group was occupational voice users, so the findings may not apply to people with lower voice demands.
The easy way to misread this
Do not conclude that vocal fold adduction has no role in voice disorders. The study found no significant group differences, but it was small, used a slow frame rate, and only looked at sustained vowels.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →