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.

中文翻译：

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喉部肌肉对公共演讲准备压力源的内在反应：个性和自主神经预测因素

目的实验室压力源已被证明会影响喉内肌 (ILM) 的活动，这可能是某些压力引起的声音障碍的最终因果途径的一部分。先前的研究表明，压力反应等人格特征可能会增加一个人对这些问题的敏感性。此外，自主神经系统反应与可能涉及 ILM 功能亢进的声音障碍的发病机制有关。本研究的目的是调查 ILM 对压力源暴露反应的人格和自主神经系统预测因子。 方法三十七名身体和声音健康的女性成年人完成了一份性格调查问卷，并接受了旨在引发压力的演讲准备任务。对 ILM 进行细线肌电图检查，以便在应激源之前和应激源期间测量这些肌肉的活动。参与者的特质应激反应被测量为基于个性的预测变量，呼吸校正呼吸性窦性心律失常也是如此，这是迷走神经流出心脏的推定指标。 结果人格测量特征应激反应独特地预测了甲杓肌、斜方肌和胫骨的活动，而呼吸性窦性心律失常独特地预测了所研究的所有肌肉的活动。在自主预测变量中观察到差异，作为变量计算中是否考虑呼吸影响的函数。 结论本研究探讨了应激源期间人格和自主功能在 ILM 活动中的潜在中介作用。这两个变量对于预测应激源暴露期间的 ILM 活动都有价值。