Abstract
ABSTRACT Purpose: to multidimensionally assess the effect of the Lax Vox® vocal technique on singers with voice complaints. Methods: a comparative intrasubject study that assessed 30 singers - 13 males and 17 females, aged 18 to 55 years - who self-reported voice complaints and had voice problems symptoms. The participants were submitted to voice assessment with perceptive-auditory, acoustic, aerodynamic, and electroglottographic voice analysis, as well as laryngeal assessment with high-speed videolaryngoscopy. The participants were assessed at two moments: 1) at the beginning of the data collection; and 2) five minutes after performing the Lax Vox® vocal technique. The groups were compared with appropriate statistical tests, with a 5% significance level. Results: in the acoustic analysis, there was an increase in the fundamental frequency for males, after using the Lax Vox® vocal technique. In the aerodynamic assessment, there was an increase in the airflow mean values during vocalization, as well as in aerodynamic power after using the Lax Vox® vocal technique in both groups. Conclusion: the Lax Vox® vocal technique, in the studied singers with a complaint of dysphonia, promoted an increase in the fundamental frequency, for males. In the aerodynamic parameters, in both sexes, it promoted an increase in the airflow and aerodynamic power.
Highlights
The speech-language-pathology treatment for dysphonia can take place either directly or indirectly
The professional instructs the patient with data for them to care for their voice, whereas in the direct approach, the speech-languagehearing therapist prescribes techniques and vocal exercises to achieve a better phonatory function[1,2]
The results of the acoustic analysis of the 13 male singers with a complaint of dysphonia revealed an increase of the f0 acoustic parameter after using the Lax Vox® vocal technique (Table 1)
Summary
The speech-language-pathology treatment for dysphonia can take place either directly or indirectly. The professional instructs the patient with data for them to care for their voice, whereas in the direct approach, the speech-languagehearing therapist prescribes techniques and vocal exercises to achieve a better phonatory function[1,2]. The semi-occluded vocal tract exercises (SOVTE) stand out. They consist of the partial occlusion of the oral cavity promoting a retroflex resonance – i.e., the energy produced by the vibration of the vocal folds returns to the glottis and expands the vocal tract, reducing their impact[3,4]. There are various SOVTE, including lip vibration, tongue vibration, glottal firmness, labial fricatives, finger kazoo, nasal sound /m/ emission, tube phonation, Lax Vox®, and the blowing and high-pitched sound exercise[3,4,5,6]
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