In the current text, 'morphometry' is used whenever a ruler is used to measure lengths (distances) (from the Greek morphe, 'shape, form,' and metria, 'measurement).
In a study with teachers who underwent the Functional Vocal Exercises program, which can be used for vocal warm-up, the effects of the program were analyzed through vocal auditory-perceptual evaluation (RASAT scale), through variability of the fundamental frequency of the acoustic analysis (Vox Metria software), the collection of aerodynamic measures, pre and postprogram application, and through vocal self-evaluation questionnaire.