Fatiga laríngea: mediciones objetivas y subjetivas de la producción vocal en dos grupos de sujetos siguiendo el uso prolongado de la voz
Keywords:
fatiga laríngea (FL), abuso vocal, mal uso vocal, sobreuso vocal, disfonías crónicas, desórdenes de voz, investigación (es)Downloads
Este informe de investigación sobre el fenómeno de la fatiga laríngea (FL) presenta los resultados de un análisis comparativo de las medidas acústicas, videoestroboscópicas y subjetivas de la producción vocal antes y después del uso prolongado de la voz en un grupo de diez cantantes y diez no cantantes. La FL es consecuencia de condiciones de abuso, mal uso y sobreuso de la voz que afecta el buen funcionamiento vocal. Ésta es responsable de cambios en las dimensiones de tono, intensidad y timbre y en las características y patrones vibratorios de las cuerdas vocales (CV). Los hallazgos de variación individual revelaron una tendencia a mantener o aumentar el tono para el post-test. Fueron observados hiatus de una magnitud y extensión mayores después de inducir experimentalmente la FL. Sin embargo, los resultados del estudio no mostraron diferencias estadísticamente significativas entre los grupos y momentos de la prueba. Una correlación poco concluyente se pudo establecer entre los registros objetivos de la evaluación vocal y los autoreportes proporcionados por los sujetos. Se concluyó que la tarea de lectura prolongada por dos horas a una intensidad confortable, según se usó en esta investigación, no conduce a estados de abuso vocal.
The purpose of this study was to describe laryngeal and acoustic voice hanges associated with laryngeal fatigue (LF) in a prolonged loud reading task. LF may be a symptom caused by factors affecting vocal function such as voice overuse, misuse or abuse. LF affects the pitch, intensity and quality of voice and vibratory patterns of vocal folds. Data were collected from 20 subjects in two groups -nonsingers and trained singers who did not have history of voice disorders- prior to and following experimentally induced LF. ResuIts from this compara tive analysis are presented. Findings about individual variations revealeda trend to maintain or increase vocal pitch in post-test measures. Greater hiatus in glottic closure were observed at the end of the task. However, resuIts from this study failed to show statistically significant differences between groups and moments as a result of the prolonged reading task. Relationships between acoustic and videostroboscopic measures and self-reports provided by the participants could not be clearly established. It was concluded that a twohour loud reading task at a comfortable vocalintensity,as used in this investigation, is not enough to induce vocal abuse states conducive to LF. Other possible reasons associated with the resuIts obtained are discussed.
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