ERIC Number: EJ1029442
Record Type: Journal
Publication Date: 2014-Feb
Abstractor: As Provided
Reference Count: N/A
Vocal Function and Upper Airway Thermoregulation in Five Different Environmental Conditions
Sandage, Mary J.; Connor, Nadine P.; Pascoe, David D.
Journal of Speech, Language, and Hearing Research, v57 n1 p16-25 Feb 2014
Purpose: Phonation threshold pressure and perceived phonatory effort were hypothesized to increase and upper airway temperature to decrease following exposure to cold and/or dry air. Greater changes were expected with mouth versus nose breathing. Method: In a within-participant repeated measures design, 15 consented participants (7 men, 8 women) completed 20-min duration trials to allow for adequate thermal equilibration for both nose and mouth breathing in 5 different environments: 3 temperatures (°C) matched for relative humidity (% RH), cold (15 °C, 40% RH), thermally neutral (25 °C, 40% RH), and hot (35 °C, 40% RH); and 2 temperatures with variable relative humidity to match vapor pressure for the neutral environment (25 °C, 40% RH), cold (15 °C, 74% RH) and hot (35 °C, 23% RH). Following each equilibration trial, measures were taken in this order: upper airway temperature (transnasal thermistor probe), phonation threshold pressure, and perceived phonatory effort. Results: Data were analyzed using repeated measures analysis of variance, and no significant differences were established. Conclusions: The study hypotheses were not supported. Findings suggest that the upper airway is tightly regulated for temperature when challenged by a realistic range of temperature and relative humidity environments. This is the first study of its kind to include measurement of upper airway temperature in conjunction with measures of vocal function.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A