“…For example, an investigation involving language therapists which assessed perceived vocal quality during spontaneous speech (using the GRBAS scale where G stands for grade, R for roughness, B for breathiness, A for asthenicity or hypofuction and S for strain) and nasality for sustained vowels between the 10th and 17th day of OCP intake and 3rd day of OCP-free interval period, could not find significant differences for these vocal parameters (16). On the contrary, other studies focusing specially on classically trained singers found that the use of certain OCPs might even improve voice quality during the menstrual cycle, bringing benefits for professional voice users (2,17,18). In a study by Isenberg, Brown, and Rothman (1983), investigating singers who had a history of irregular menstrual cycles and related vocal problems, it was found that their body temperature and their speaking fundamental frequencies were stabilized and raised to a higher pitch when they started to use an OCP.…”