Preliminary study on the quantitative analysis of vocal loading effects on vocal fold dynamics using phonovibrograms

Area of Science:

• Laryngology
• Acoustic analysis
• Voice biomechanics

Background:

• Vocal loading can impact vocal fold function.
• Understanding vocal fold dynamics is crucial for voice health.
• High-speed imaging offers detailed visualization of vocal fold movement.

Purpose of the Study:

• To assess if high-speed digital imaging and phonovibrogram (PVG) analysis can identify vocal fold vibratory changes due to vocal fatigue.
• To evaluate the effects of vocal loading on voice production in healthy subjects.

Main Methods:

• Endoscopic high-speed imaging of larynges from three healthy subjects under varying vocal load conditions.
• Segmentation and processing of vocal fold dynamics using PVGs.
• Quantitative analysis of PVG images and statistical analysis (linear discrimination, ANOVA, t-tests) to identify vocal loading effects and inter-subject differences.

Main Results:

• PVG analysis precisely quantified vocal fold dynamics, enabling individual subject characterization.
• Vocal loading altered PVG parameters related to posterior vocal fold opening and closing dynamics.
• Slight asymmetries in vibratory behavior between left and right vocal folds were observed in all subjects.

Conclusions:

• Vocal loading demonstrably affects vocal fold vibratory characteristics in healthy individuals.
• Phonovibrogram analysis can identify left-right vocal fold vibratory asymmetries.
• High-speed imaging combined with PVG analysis is a promising tool for studying vocal fold fatigue and dynamic changes.