Effect of Chin-Down Position on Vocal Mean Pitch and Intensity
Background Voice, a unique characteristic of each individual, is an outcome of the configuration and function of various components of the vocal tract. Pitch and loudness, being integral parts of voice, vary with changes in factors such as muscle tension, subglottal pressure, and position. Chin down is often the recommended voice therapy for lowering pitch. But there is no literature available as to by how much does it actually change the mean pitch and intensity. The present study was undertaken to understand the effect on the vocal mean pitch and intensity when head position is changed to chin-down position.
Methods Thirty women aged 18 to 25 years were included in this preliminary study. Individuals having any history of voice disorder were excluded. Voice samples were collected using clinical microphone and acoustically analyzed using the Praat software. The participants were instructed to phonate and count numbers in neutral position and chin down position.
Results It was observed that there was no change in the acoustic or perceptual measure of pitch with change in the head position. However, there was a significant reduction in the intensity for phonation task in the chin-down position.
Conclusion Speech language pathologists need to provide chin down as a facilitative technique for lowering larynx along with other voice therapies which are proved to effectively lower pitch.
12 February 2020 (online)
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