Apfelbach Christopher S, Sandage Mary, Abbott Katherine Verdolini
Department of Speech-Language-Hearing Sciences, University of Minnesota, Minneapolis, Minnesota.
Department of Speech, Language & Hearing Sciences, Auburn University, Auburn, Alabama.
J Voice. 2024 Sep 6. doi: 10.1016/j.jvoice.2024.08.017.
Vocal loading tasks are often used to study how specific variables influence downstream vocal effort or fatigue. The current study introduces a novel vocal loading task, the Fluid Interval Test for Voice (FIT-V) that combines laryngeal diadochokinesis, intervallic rest and exercise, and fluid back pressure. To assess the differences between this novel task and existing vocal loading tasks, we measured vocal fold vibratory dose and perceived phonatory exertion across three 30-minute task conditions: a control loud oral reading task (LOR), a back pressure-resisted Fluid Interval Test for Voice (FIT-V), and an unresisted Fluid Interval Test for Voice (FIT-V).
Following a training session, 30 participants completed the three tasks (LOR, FIT-V, and FIT-V) in counterbalanced order on different days. Vocal fold cycle (Aim 1A) and distance doses (Aim 1B) were collected continuously using a dosimeter. The overall perceived phonatory exertion (Aim 2A) was rated once per minute, while anatomically localized cognitive, laryngeal, thoracic, abdominal, and articulatory exertion (Aim 2B) were rated once at the end of each task. Statistical analyses examined the effects of task and task× time interactions on the dependent variables.
The FIT-V and FIT-V tasks imposed smaller vocal fold cycle doses (P < 0.001; Aim 1A) and distance doses (P < 0.001; Aim 1B) than the LOR task while eliciting comparable or greater magnitudes of overall perceived phonatory exertion (P = 0.003; Aim 2A). However, anatomically localized perceived exertion was greater in the abdomen and thorax (P < 0.05) and lesser in the anterior neck (P < 0.05) in the two FIT-V tasks relative to the LOR task (Aim 2B). Absolute forced vital capacity was a significant predictor of most forms of anatomically localized perceived exertion.
The unresisted FIT-V and the back pressure-resisted FIT-V tasks yielded similar profiles of overall perceived phonatory exertion, despite vocal fold vibratory doses roughly half that of the LOR task. However, the anatomically localized perceived exertion data underscored subtle across-task differences not apparent in the overall ratings, suggesting potentially distinct physiological and perceptual niches for the three task protocols.
发声负荷任务常用于研究特定变量如何影响下游的发声努力或疲劳。本研究引入了一种新型发声负荷任务，即嗓音流体间隔测试（FIT-V），它结合了喉部交替运动、间隔休息与练习以及流体背压。为了评估这项新任务与现有发声负荷任务之间的差异，我们在三种30分钟的任务条件下测量了声带振动剂量和感知到的发声用力程度：对照大声朗读任务（LOR）、背压抵抗性嗓音流体间隔测试（FIT-V）以及无抵抗性嗓音流体间隔测试（FIT-V）。
在一次训练课程之后，30名参与者在不同日期以平衡顺序完成了这三项任务（LOR、FIT-V和FIT-V）。使用剂量计连续收集声带周期（目标1A）和距离剂量（目标1B）。每分钟对总体感知到的发声用力程度（目标2A）进行一次评分，而在每项任务结束时对解剖学定位的认知、喉部、胸部、腹部和关节用力程度（目标2B）进行一次评分。统计分析检验了任务以及任务×时间交互作用对因变量的影响。
与LOR任务相比，FIT-V和FIT-V任务产生的声带周期剂量（P < 0.001；目标1A）和距离剂量（P < 0.001；目标1B）更小，同时引发的总体感知到的发声用力程度相当或更大（P = 0.003；目标2A）。然而，相对于LOR任务（目标2B），在两项FIT-V任务中，解剖学定位的感知用力程度在腹部和胸部更大（P < 0.05），在前颈部更小（P < 0.05）。绝对用力肺活量是大多数形式的解剖学定位感知用力程度的重要预测指标。
尽管声带振动剂量大约是LOR任务的一半，但无抵抗性FIT-V和背压抵抗性FIT-V任务产生的总体感知到的发声用力程度情况相似。然而，解剖学定位的感知用力程度数据突显了总体评分中未明显体现的细微任务间差异，这表明这三种任务方案可能存在不同的生理和感知特点。
