Effects of a simulated system of straw phonation on the complete phonatory range of excised canine larynges

Abstract

Purpose-This study investigated the effects of straw phonation therapy on the aerodynamic and acoustic parameters of the vocal folds at different levels of elongation and subglottal pressure. Methods-20 excised canine larynges were used in both experimental (straw phonation therapy simulation) and control conditions. Aerodynamic parameters, including phonation threshold pressure (PTP), phonation instability pressure (PIP), phonation pressure range (PPR), phonation threshold flow (PTF), phonation instability flow (PIF), phonation flow range (PFR), were obtained at different level of vocal fold elongation (0%, 10%, 20%). Acoustic parameters, including fundamental frequency (F0), jitter, shimmer, signal noise ratio (SNR) were detected at different levels of vocal fold elongation (0%, 10%, 20%) and subglottal pressure (15 cmH 2 O, 20 cmH 2 O, 25 cmH 2 O). Results-Significant decreases in PTP and PTF and significant increases in PIP, PIF, PPR, PFR were occurred in experimental condition at all levels of elongation when compared with control condition. However, no significant changes of acoustic parameters were obtained between conditions at all levels. Conclusion-At different levels of vocal fold elongation, straw phonation not only lowered the onset of normal voice, but also elevated the onset of chaotic voice, indicating a better voice economy and voice control. Moreover, the improved phonatory range demonstrated straw phonation had the potential to prevent voice users who have high voice demand from voice fatigue and vocal damage.

Immediate and Short-term Effects of Straw Phonation in Air or Water on Vocal Fold Vibration and Supraglottic Activity of Adult Patients with Voice Disorders Visualized with Strobovideolaryngoscopy: A Pilot Study

“…Although SP has a long history in voice training and rehabilitation, empirical evidence dates from the last two decades [1,26]. Efficacy studies investigating the immediate effects of SP have focused mainly on aerodynamic, acoustic and electroglottographic (EGG) alterations [4,6,[8][9][10]22,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Also, MRI and CT studies are available [15,43,44].…”

Immediate effects of straw phonation in air or water on the laryngeal function and configuration of female speech‐language pathology students visualised with strobovideolaryngoscopy: A randomised controlled trial

“…Current knowledge about the immediate effects of SOVT phonation on the laryngeal function and configuration is based mainly on in silico (computer simulations) (Lã et al, 2017; Titze, 2006; Titze & Laukkanen, 2007; Titze, 2020; Titze et al., 2021) or excised larynges studies (Conroy et al., 2014; Kang et al., 2019; Mills et al., 2017; Tangney et al., 2021). In in vivo SOVT studies, electroglottography (EGG) has been the most commonly used laryngeal outcome, showing contradictory results between studies (Meerschman et al., Systematic Review in preparation [CRD42021274203]).…”