Intensidade de los sintomas de fatiga vocal y parâmetros acústicos de las professoras antes y después de la carga vocal / The intensity of vocal fatigue symptoms and acoustic parameters of teachers before and after vocal loading / Intensidade dos sintomas da fadiga vocal e parâmetros acústicos de professoras antes e após exposição vocal

Introdução: A fadiga vocal é um conjunto de sintomas vocais manifestados após o uso prolongado e/ou intenso da voz, algo amplamente observado em professores. Objetivo: descrever e comparar os parâmetros acústicos e de autopercepção dos sinais e sintomas da fadiga vocal antes e após a exposição vocal pelo professor no ambiente ocupacional. Método: 30 mulheres, com média de idade de 40,37 anos, professoras do ensino público que foram submetidas à extração dos parâmetros acústicos e autoavaliação da intensidade dos sintomas da fadiga vocal antes e depois do uso vocal em sala de aula. Foi utilizado o programa Advanced Mult-Dimensional Voice Programm (MDVP-Adv) na análise acústica. Resultados: apenas a medida de ruído (SPI) demostrou-se significante (p=0.02) nos parâmetros acústicos. Os sintomas de rouquidão, falhas na voz, ardência/ queimação na garganta, cansaço para manter a fala apresentaram aumento após o uso da voz ocupacional. Conclusão: houve diminuição da taxa de soprosidade (SPI) e aumento de alguns sintomas da fadiga vocal após o uso prolongado da voz no ambiente ocupacional por professoras.

Introduction: Vocal fatigue is a set of vocal symptoms manifested after prolonged and/or intense vocal use that is frequently observed in teachers. Objective: to describe and compare acoustic parameters and self-perception of vocal fatigue symptoms before and after a vocal exposure by the teacher in the occupational environment. Methods: 30 women, with an average of 40.37 years old, public school teachers, were submitted to the recording of acoustic parameters and self-perception evaluation of the intensity of vocal fatigue symptoms before and after vocal use in the classroom. The Advanced Mult-Dimensional Voice Programm (MDVP-Adv) was used to extract acoustic parameters. Results: only the SPI parameter of noise showed a significant decrease after vocal use (p=0.02). Symptoms of hoarseness, vocal failures, sore/ burning throat, tiredness to maintain speech increased after occupational voice use. Conclusion: after occupational voice use, the SPI breathiness rate decreased and the vocal fatigue symptoms increased.

Introducción: La fatiga vocal es um conjunto de sintomas vocales que se manifiestan tras um uso vocal prolongado y /o intenso, ampliamente observado en los profesores.Objetivo: describir y comparar los parâmetros acústicos y la autopercepción de los sintomas de fatiga vocal antes y después de uma exposición vocal por parde del professor em el entorno ocupacional. Métodos: 30 mujeres, com um promedio de 40.37 años, los maestros de escuelas públicas fueron sometidos a extracción de parámetros acústicos y autopercépcion de la intensidad de los síntomas de fatiga vocal antes y después del uso vocal en el aula. Se utilizó el Advanced Mult-Dimensional Voice Programm (MDVP-Adv) para extraer los parâmetros acústicos. Resultados: el parâmetro de ruído SPI mostro uma disminución significativa después del uso vocal (p=0.02). Los sintomas de ronquera, fallas vocales, dolor de garganta/ ardor, cansancio para mantener el habla aumentaron después del uso de la voz ocupacional. Conclusión: después del uso ocupacional de la voz, el SPI disminuyó y los sintomas de fatiga vocal aumentaron.

Fundamental Frequency and Formants Before and After Prolonged Voice Use in Teachers.

OBJECTIVES: This study aimed to describe and correlate the fundamental frequency behavior and the first four formants before and after exposure to usual and routinely prolonged voice use from teachers with over 4 years of experience in teaching. STUDY DESIGN: The study design is observational and transversal with quantitative and descriptive evaluations. METHODS: A total of 28 female teachers were subjected to the Screening Index for Voice Disorder (SIVD) and to recordings of the sustained vowel /a/ before and after exposure to prolonged voice use. Data were obtained about the fundamental frequency and the first four formants before and after voice use. Descriptive analysis and statistical processing were performed with P ≤ 0.05 for the general sample and in groups according to the outcome of the SIVD (normal and altered) and the evaluation period (morning or afternoon). RESULTS: The average exposure time to prolonged voice use was 176 minutes. There was no statistical difference in any of the variables studied. Correlations were positive and similar across all assessments before the class, something not observed in evaluations conducted after exposure to prolonged voice use. In the general sample, altered SIVD and afternoon period groups, the second formant from before-class measurements seems to interfere negatively in the fourth formant from after-class measurements. CONCLUSIONS: There were no changes in vocal behavior before and after exposure to prolonged voice use in the occupational environment. However, formants F1 and F2 measured before class correlated inversely with F4 after exposure to prolonged voice use.