Voice amplifier: effects on dose and vocal intensity of teachers without dysphonia.

Purpose: Analyze the interference of using the voice amplifier in vocal dose of non-dysphonic teachers.

Methods: This is an experimental study comparing people from the same ambience compound for 20 teachers from municipal elementary school in Belo Horizonte/MG. After consent, the participants were requested to answer the vocal symptom scale questionnaire (ESV) and later participated in two different moments of the study, for which they randomly selected.