Thermal, Acoustic, and Self-Perceptual Measures of Pre-Post Vocal Change After Surface Hydration in Speech-Language Pathologists.

Abstract

Purpose: Numerous clinical findings support the idea that increased surface laryngeal hydration prevents and manages voice problems in professional voice users. However, empirical evidence for surface laryngeal hydration (nebulized saline solution) through multidimensional voice measures is lacking, especially in speech-language pathologists (SLPs). Hence, the present study investigated the effect of surface hydration using nebulized saline solution on voice quality using thermal, acoustic, and self-perceptual measures in SLPs.

Methods: The study involved 30 SLPs divided into three groups: group I had no voice usage, group II read aloud passage for 1 hour without surface hydration, and group III read aloud passage for 1 hour with surface hydration for 10 minutes. Multidimensional voice outcomes such as thermal (front, right, and left view of the throat), acoustic (Multidimensional Voice Program), and self-perceptual (perceived phonatory effort, perceived vocal tiredness) were measured for the pretest and post test condition in all the group.

Results: Pre-post comparison shows that thermal measures showed a significant increase in group II and a significant decrease in group III. Also, fundamental frequency, perturbation, and self-perceptual measures showed a significant increase in group II compared to group III. Further, the between-group post test comparisons revealed a significant decrease in many outcome measures in group III compared to group II. The above results support that surface hydration significantly influenced the voice quality during the vocal loading task.

Conclusion: The study confirms the benefits of surface hydration using saline solution in SLPs. Surface hydration preserves vocal quality compared to those not hydrated during vocal loading.