Department of Communicative Sciences and Disorders, Michigan State University, East Lansing, Michigan.
Department of Collective Health, Faculty of Nursing, Universidad Nacional de Colombia, Bogotá, Colombia; Speech and Language Pathology Program, Universidad Manuela Beltrán, Bogotá, Colombia.
J Voice. 2024 Mar;38(2):458-465. doi: 10.1016/j.jvoice.2021.09.030. Epub 2021 Nov 26.
A case study was used to determine which acoustic parameters would be sensitive to a SOVT-based vocal warm-up over the duration of a standard voice treatment.
The longitudinal research design consisted of repeated voice measures during 7 weeks from a single subject, a 48-year-old male occupational voice user with a history of voice disorders. A steady phonation and running speech tasks were performed before and after an intensive 1-minute water-resistance voice exercise (WRT). Acoustic assessment of the pre-and postrecordings from each session was obtained with freely accessible software (e.g., Audacity, PRAAT) and acoustic measures (e.g., fundamental frequency, jitter, shimmer, alpha ratio, NHR, HNR, L1L0, Cepstral Peak Prominence smoothed).
After WRT, the analysis indicated that jitter, shimmer, and NHR had a small but statistically significant decrease, while alpha ratio, CPPS, and HNR had a statistically significant increase. For the days where there were six repetitions, there was a larger effect in the later repetitions in the day for some metrics (i.e., alpha ratio, shimmer, NHR, CPPS), while others had the biggest effect in the first two repetitions in a day (i.e., jitter, HNR).
A short vocal water-resistance voice task had a positive effect on the short-term acoustic voice metrics after each repetition of the exercise, independent of the number of repetitions throughout the day. When five repetitions of this exercise routine occurred, there was a more substantial influence on the proportion of acoustic voice changes.
通过对一名职业嗓音使用者（48 岁男性，有嗓音障碍病史）进行为期 7 周的单次研究，以确定哪些声学参数会对基于 SOVT 的嗓音热身产生敏感反应。
纵向研究设计包括在 1 分钟水抗阻发声练习（WRT）前后重复进行 7 周的单次个体发声测量。在每个测试会话中，使用免费软件（如 Audacity、PRAAT）进行稳态发声和连续言语任务，并获得录音前、后的声学评估，测量的声学参数包括基频、抖动、声颤度、声门噪声比、HNR、L1L0、CPPS 平滑度。
WRT 后，分析表明抖动、声颤度和 NHR 略有下降且具有统计学意义，而 alpha 比、CPPS 和 HNR 则具有统计学意义的增加。对于有 6 次重复的日子，在当天的后几次重复中，一些指标（即 alpha 比、声颤度、NHR、CPPS）的效果更大，而其他指标在前两次重复中效果最大（即抖动、HNR）。
简短的声乐水抗阻发声任务对每次练习后的短期声学嗓音指标有积极影响，而与全天重复次数无关。当每天进行 5 次这种练习时，对声学嗓音变化比例的影响更大。
