Holm Jakob R, Green Sylvia, Gilvydis Tomas K, Wischhoff Owen P, Bienhold Grayson J, Nickels Adriana M, Jiang Jack J
Department of Surgery, Division of Otolaryngology, University of Wisconsin-Madison, Madison, WI.
Department of Surgery, Division of Otolaryngology, University of Wisconsin-Madison, Madison, WI.
J Voice. 2025 Jan 22. doi: 10.1016/j.jvoice.2025.01.009.
Straw phonation therapy, a form of semi-occluded vocal tract (SOVT) exercise, is commonly used to help treat various voice disorders. Although straw phonation therapy has been studied extensively for decades, the impact of straw depth on vocal function remains unexplored. This study aims to quantify the effects of various straw vocal tract insertion depths (VTID) into the vocal tract on common aerodynamic parameters such as phonation threshold pressure (PTP), phonation threshold flow (PTF), and phonation threshold power (PTW) in an ex vivo canine model. It was hypothesized that increasing the VTID of the straw would reduce the PTP, PTF, and PTW.
Five excised canine larynges were mounted on a pseudolung apparatus and attached to a simulated vocal tract in an acoustic sound booth. Two straw depths (20.0 and 60.0 mm) were tested to determine the effect of VTID on ease of phonation as indicated by the aerodynamic parameters of PTP, PTF, and PTW. The control had no straw and a VTID of 0.0 mm. The straw diameter and length above the simulated vocal tract were consistent between the straws. Sustained phonation was achieved, and aerodynamic data was collected and analyzed.
Both straw treatment groups exhibited significant reductions in PTP and PTW compared to the control. However, there were no significant differences between the 20.0 or 60.0 mm straw depths in PTP, PTF, or PTW.
The presence of a straw significantly reduced PTP and PTW, but VTID did not appear to influence these outcomes. This supports previous straw phonation therapy research suggesting that straw phonation therapy is beneficial primarily due to the presence of the straw rather than the depth of insertion. Future studies should explore the combined effects of varying straw diameters, lengths, and depths to optimize SOVT therapy for clinical use.
吸管发声疗法是半阻塞声道（SOVT）训练的一种形式，常用于帮助治疗各种嗓音障碍。尽管吸管发声疗法已经被广泛研究了几十年，但吸管插入深度对嗓音功能的影响仍未得到探索。本研究旨在通过离体犬模型，量化不同吸管声道插入深度（VTID）对常见空气动力学参数的影响，如发声阈压（PTP）、发声阈流量（PTF）和发声阈功率（PTW）。研究假设是增加吸管的VTID会降低PTP、PTF和PTW。
将五个切除的犬喉安装在假肺装置上，并连接到声学隔音室内的模拟声道。测试了两种吸管深度（20.0和60.0毫米），以确定VTID对发声难易程度的影响，发声难易程度由PTP、PTF和PTW的空气动力学参数表示。对照组没有吸管，VTID为0.0毫米。吸管直径和模拟声道上方的长度在各吸管之间保持一致。实现持续发声，并收集和分析空气动力学数据。
与对照组相比，两个吸管治疗组的PTP和PTW均显著降低。然而，20.0或60.0毫米吸管深度在PTP、PTF或PTW方面没有显著差异。
吸管的存在显著降低了PTP和PTW，但VTID似乎并未影响这些结果。这支持了先前的吸管发声疗法研究，表明吸管发声疗法主要因其存在而有益，而非插入深度。未来的研究应探索不同吸管直径、长度和深度的综合影响，以优化SOVT疗法用于临床。
