Mills Randal D, Rivedal Shawna, DeMorett Colten, Maples Grace, Jiang Jack J
Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Wisconsin-Madison School of Medicine and Public Health, Madison, Wisconsin.
Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, University of Wisconsin-Madison School of Medicine and Public Health, Madison, Wisconsin.
J Voice. 2018 May;32(3):386.e21-386.e29. doi: 10.1016/j.jvoice.2017.05.015. Epub 2017 Jun 22.
To examine the immediate effects of straw phonation exercises in normal subjects while altering the effective length of the vocal tract.
A nonrandomized comparison of semi-occluded vocal tract length during straw phonation exercises was carried out.
Oral pressure, mean airflow, aerodynamic resistance, and contact quotient were measured in 20 healthy subjects immediately before and after straw phonation exercises. A short- and long-duration phonatory task was used to examine the voice parameters during semi-occluded vocal tract exercises. These tasks involved repeating a vocalization of the vowel /a/ through a tube. Each subject underwent the protocol using tubes of three different lengths (7.5 cm, 15 cm, and 30 cm) to allow for the effect of moving the outlet of the vocal tract distal to the mouth to be monitored.
Oral pressure and aerodynamic resistance decreased significantly, contact quotient showed a decreasing trend, and airflow increased significantly in pre- and postmeasurements 15 minutes after a long-duration phonatory task. Short-duration tasks were found to have no effect on voice parameters.
The results present and validate a method to isolate the effect that the length of a semi-occluded vocal tract has during straw phonation exercises.
在改变声道有效长度的同时，研究吸管发声练习对正常受试者的即时影响。
对吸管发声练习期间半阻塞声道长度进行非随机比较。
在20名健康受试者进行吸管发声练习之前和之后，立即测量口腔压力、平均气流、空气动力学阻力和接触商。使用短期和长期发声任务来检查半阻塞声道练习期间的嗓音参数。这些任务包括通过一根管子重复元音/a/的发声。每个受试者使用三种不同长度（7.5厘米、15厘米和30厘米）的管子进行该方案，以监测将声道出口移至口腔远端的影响。
在长期发声任务15分钟后的测量前和测量后，口腔压力和空气动力学阻力显著降低，接触商呈下降趋势，气流显著增加。发现短期任务对嗓音参数没有影响。
研究结果提出并验证了一种方法，以分离半阻塞声道长度在吸管发声练习期间产生的影响。
