Efectos acústicos inmediatos de una secuencia de ejercicios vocales con tubos de resonancia
Immediate effects of a vocal exercise sequence with resonance tubes
Marco Guzmán; Diego Higueras; Catherine Fincheira; Daniel Muñoz; Carlos Guajardo
Resumen
Objetivo: el propósito de este estudio es conocer el efecto acústico inmediato de una secuencia de ejercicios fonatorios utilizando tubos de resonancia en un grupo de sujetos disfónicos.
Método: se aplicó una secuencia única de cuatro tareas fonatorias dentro de tubos de resonancia a veinticuatro profesores con voces disfónicas, evaluadas perceptualmente con la escala GRBAS. Las muestras de voz fueron grabadas antes y después de la secuencia de ejercicios. El análisis acústico incluyó Cepstrum, Jitter, Shimmer y relación armónico-ruido (NHR). Se solitó completar un protocolo de autovaloración vocal posterior a la secuencia de ejercicios para evaluar los efectos subjetivos. Se compararon los valores de los parámetros acústicos en las muestras pre y post entrenamiento.
Resultados: cambios significativos fueron obtenidos en el análisis Cepstral, Jitter y relación armónico-ruido. En la autovaloración, los efectos positivos predominaron sobre los negativos, siendo los principales: voz más estable, voz más clara y garganta más abierta.
Conclusión: el uso de tareas fonatorias dentro de tubos de resonancia puede tener un efecto fisiológico terapéutico inmediato en sujetos con voces disfónicas y una percepción subjetiva de mejoría en la producción de la voz posterior a la terapia.
Palabras clave
Abstract
Purpose: the purpose of this study is to determine the immediately acoustic effect of phonatory exercise sequence using resonance tubes in a group of dysphonic subjects.
Method: a unique sequence of four phonatory tasks within resonance tubes was applied in twenty-four teachers with dysphonic voices, assessed perceptually with GRBAS scale. Voice samples were recorded before and after the exercise sequence. Acoustic analysis included the following items: Cepstrum, Jitter, Shimmer, noise-harmonic ratio (NHR). Subjects were asked to fill out a vocal self-assessment protocol after the exercise sequence in order to assess the subjective effects of these exercises. Acoustic parameters of voice samples pre and post training were compared.
Results: significant changes were obtained in the Cepstral analysis, jitter and harmonic-to-noise ratio. In the self-assessment, positive effects prevailed over the negative ones, being the main, as follows: more steady voice, more clear voice and more open throat sensation.Conclusion: the outcome indicates that the use of phonatory tasks with resonance tubes may have immediate therapeutic physiological effects on subjects with hoarse voices and a subjective perception of improvement in voice production after the therapy.
Keywords
Referencias
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Submitted date:
18/01/2011
Accepted date:
06/04/2011
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