The purpose of this study is to suggest sound biofeedback, which is a new technique of early stress relief effect by observing change in the heart rate variability (HRV). The sound biofeedback imitating heart rate of the comfortable and stress state is termed parasympathetic stimulation sound (PSS) and sympathetic stimulation sound (SSS), respectively. Twelve subjects were selected without previous history of cardiovascular diseases and mental illness, such as arrhythmia, myocardial infarction, depression and panic disorder. To confirm the changes in the low-frequency (LF), high-frequency (HF) and LF/HF values of HRV as stress evaluation indicators, the HRV of subjects was measured by photoplethysmogram. Signals were processed using the peak detect algorithm, and fast Fourier transform. Results were obtained using power specific densities. During the PSS stimulation, the LF/HF tended to decrease generally. On the other hand, during the SSS stimulation, LF/HF tended to increase. The LF/HF Mean change value (P<0.05) using the PSS stimulation is similar to the effect of Transcutaneous Vagal Nerve Stimulation (tVNS). In addition, the quantitative effect of sound biofeedback was confirmed by judging changes in the parasympathetic and sympathetic nerves in the autonomic nervous system (ANS) through Z-score normalized data. These experimental results suggest that sound biofeedback has the same stimulation location and clinical applicability as tVNS. As a result, sound biofeedback may be used as a new method for stress reduction.

中文翻译：

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通过心率变异性分析确认临床价值和声音生物反馈对自主神经系统的影响

本研究的目的是提出合理的生物反馈，这是一种通过观察心率变异性 (HRV) 的变化来早期缓解压力的新技术。模拟舒适和压力状态下心率的声音生物反馈分别称为副交感神经刺激声（PSS）和交感神经刺激声（SSS）。选择了12名没有心血管疾病和精神疾病病史的受试者，例如心律失常、心肌梗塞、抑郁症和恐慌症。为确认HRV低频（LF）、高频（HF）和LF/HF值的变化作为应激评价指标，通过光电容积描记图测量受试者的HRV。使用峰值检测算法和快速傅里叶变换处理信号。使用功率比密度获得结果。在PSS刺激期间，LF/HF普遍趋于降低。另一方面，在 SSS 刺激期间，LF/HF 趋于增加。LF/HF 平均变化值 (磷<0.05) 使用 PSS 刺激与经皮迷走神经刺激 (tVNS) 的效果相似。此外，通过判断自主神经系统（ANS）中的副交感神经和交感神经的变化，证实了声音生物反馈的定量效果。Z- 评分标准化数据。这些实验结果表明，声音生物反馈与 tVNS 具有相同的刺激位置和临床适用性。因此，声音的生物反馈可以用作减轻压力的新方法。