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Codas. 2016 9-10;28(5):618-624. doi: 10.1590/2317-1782/20162015168.

Immediate effects of the semi-occluded vocal tract exercise with LaxVox® tube in singers.

[Article in English, Portuguese]

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Universidade Tuiuti do Paraná - UTP - Curitiba (PR), Brasil.
Universidade Estadual do Centro-Oeste - UNICENTRO - Irati (PR), Brasil.
Escola de Música e Belas Artes do Paraná, Universidade Estadual do Paraná - UNESPAR - Curitiba (PR), Brasil.



The purpose of this study was to analyze the immediate effects of the semi-occluded vocal tract exercise (SOVTE) using the LaxVox® tube in singers.


Participants were 23 singers, classical singing students, aged 18 to 47 years (mean age = 27.2 years). First, data was collected through the application of a demographic questionnaire and the recording of sustained emission - vowel /ε/, counting 1-10, and a music section from the participants' current repertoire. After that, the participants were instructed and performed the SOVTE using the LaxVox® tube for three minutes. Finally, the same vocal samples were collected immediately after SOVTE performance and the singers responded to a questionnaire on their perception regarding vocal changes after the exercise. The vocal samples were analyzed by referees (speech-language pathologists and singing teachers) and by means of acoustic analysis.


Most of the singers reported improved voice post-exercise in both tasks - speech and singing. Regarding the perceptual assessment (sustained vowel, speech, and singing), the referees found no difference between pre- and post-exercise emissions. The acoustic analysis of the sustained vowel showed increased Fundamental Frequency (F0) and reduction of the Glottal to Noise Excitation (GNE) ratio post-exercise.


The semi-occluded vocal tract exercise with LaxVox® tube promotes immediate positive effects on the self-assessment and acoustic analysis of voice in professional singers without vocal complains. No immediate significant changes were observed with respect to auditory-perceptual evaluation of speech and singing.

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