Helou Leah B, Jennings J Richard, Rosen Clark A, Wang Wei, Verdolini Abbott Katherine
Department of Communication Science and Disorders, University of Pittsburgh, PA.
Department of Psychiatry, University of Pittsburgh, PA.
J Speech Lang Hear Res. 2020 Sep 15;63(9):2940-2951. doi: 10.1044/2020_JSLHR-19-00402. Epub 2020 Sep 3.
Purpose Laboratory stressors have been shown to impact the activity of the intrinsic laryngeal muscles (ILMs), which may be part of the final causal pathway in some stress-induced voice disorders. Previous research suggests that personality traits such as stress reaction might increase one's susceptibility to these problems. Also, the autonomic nervous system response is implicated in the pathogenesis of voice disorders putatively involving ILM hyperfunction. The purpose of this study was to investigate personality and autonomic nervous system predictors of ILM responses to stressor exposure. Method Thirty-seven physically and vocally healthy female adults completed a personality questionnaire and were subjected to a speech preparation task intended to induce stress. Fine wire electromyography of the ILMs was performed so that the activity of these muscles could be measured prior to and during the stressor. Participants' trait stress reaction was measured as a personality-based predictive variable, as was respiratory-corrected respiratory sinus arrhythmia, a putative measure of vagal outflow to the heart. Results The personality measure trait stress reaction uniquely predicted thyroarytenoid, trapezius, and tibialis activity, whereas respiratory sinus arrhythmia uniquely predicted the activity of all muscles studied. Differences were observed in the autonomic predictor variable as a function of whether or not effects of respiration were accounted for in the variable's calculation. Conclusions This study explores the potential mediating roles of personality and autonomic function in ILM activity during a stressor. Both variables have value in predicting ILM activity during stressor exposure.
目的 实验室应激源已被证明会影响喉内肌（ILMs）的活动，这可能是某些应激诱导的嗓音障碍最终因果途径的一部分。先前的研究表明，诸如应激反应等人格特质可能会增加一个人对这些问题的易感性。此外，自主神经系统反应被认为与可能涉及ILM功能亢进的嗓音障碍发病机制有关。本研究的目的是调查人格和自主神经系统对ILM对应激源暴露反应的预测因素。方法 37名身体和嗓音健康的成年女性完成了一份人格问卷，并接受了一项旨在诱导应激的言语准备任务。对ILMs进行细针肌电图检查，以便在应激源之前和期间测量这些肌肉的活动。参与者的特质应激反应作为基于人格的预测变量进行测量，呼吸校正后的呼吸性窦性心律不齐也是如此，这是一种推测的迷走神经向心脏流出的测量方法。结果 人格测量特质应激反应独特地预测了甲杓肌、斜方肌和胫骨前肌的活动，而呼吸性窦性心律不齐独特地预测了所有研究肌肉的活动。在自主预测变量中观察到差异，这取决于在变量计算中是否考虑了呼吸的影响。结论 本研究探讨了人格和自主功能在应激源期间ILM活动中的潜在中介作用。这两个变量在预测应激源暴露期间的ILM活动方面都有价值。
