Katerina A Smereka, Adriana M Nickels, Owen P Wischhoff, Matthew A Silverman, Jack J Jiang
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引用次数: 0
Abstract
Objective: The objective of this study is to expand on a novel method for semioccluded vocal tract therapy (SOVT) called controlled supraglottic pressure phonation, and investigate the mechanism that introduced supraglottic pressure mediates a decrease in impedance during SOVT therapy. Instead of the previously used CPAP mask, this study analyzes controlled supraglottic pressure phonation by use of a straw mouthpiece to deliver supraglottic pressure.
Methods: Twenty-six human subjects were randomly assigned to one of four supraglottic pressure levels: 0, 2, 4, and 6 cm H2O, which were controlled through a continuous positive airway pressure device. Subjects were asked to phonate during a SOVT task for one round (referred to as the "short-duration" task) and eight rounds (referred to as the "long-duration" task), in which acoustic and aerodynamic properties were measured before and after. Subjects were surveyed for the levels of discomfort experienced during controlled supraglottic pressure phonation therapy and subjective levels of improvement of vocal economy.
Results: Significant differences were observed between pre- and post-task measurement for phonation threshold pressure for the long-duration task for the 2 cmH2O group. Frequency measurement was not found to have statistically significant differences. The perceived phonatory effort was not significantly different at any pressure levels.
Conclusions: Lower supraglottic pressure levels will improve ease of phonation for longer durations, however, shorter-duration tasks will not be effective. Controlled supraglottic pressure phonation coupled with straw phonation may produce an improved vocal economy for those who have access to an oppositional airflow setup.
期刊介绍:
The Journal of Voice is widely regarded as the world''s premiere journal for voice medicine and research. This peer-reviewed publication is listed in Index Medicus and is indexed by the Institute for Scientific Information. The journal contains articles written by experts throughout the world on all topics in voice sciences, voice medicine and surgery, and speech-language pathologists'' management of voice-related problems. The journal includes clinical articles, clinical research, and laboratory research. Members of the Foundation receive the journal as a benefit of membership.