We developed a simple method for identifying resonance frequency by focusing on the spectral peak of the low-frequency (LF) component of heart rate variability (HRV) and examined the hypothesis that paced breathing at an accurate resonance frequency increases HRV and baroreflex sensitivity (BRS). We assessed a peak frequency of the LF component of the resting HRV by using power spectral analysis under respiratory control at 0.25 Hz, and a resonance frequency, which was evaluated by using the standard breathing maneuver (Lehrer 2007). We examined the effects of paced breathing at the peak frequency of the LF component (Spectral condition) and paced breathing at the resonance frequency as determined by the standard breathing maneuver (Standard condition) on HRV and BRS in 28 healthy college students and young adults. Electrocardiogram, respiration, and noninvasive continuous blood pressure was recorded during a 5-min baseline, followed by a 5-min paced breathing session. Results indicated that the BRS increased during the breathing session under both conditions, but the increase in BRS under the Spectral condition was higher than the Standard condition (p < .05). The LF amplitude increased during the breathing session under both conditions (p < .001), although the difference between the conditions was not significant. These results suggest that paced breathing at the peak frequency of the LF component enhanced the autonomic baroreflex function. Moreover, assessment of the LF-peak may provide more accurate information on resonance frequency for paced breathing during HRV biofeedback.

中文翻译：

---

低频峰值处的缓慢呼吸对心率变异性和Baroreflex敏感性的影响。

我们通过关注心率变异性（HRV）的低频（LF）分量的频谱峰值，开发了一种用于识别共振频率的简单方法，并研究了以下假设：以正确的共振频率进行定时呼吸会增加HRV和压力反射敏感性（BRS） ）。我们通过在0.25 Hz的呼吸控制下使用功率谱分析评估了静息HRV的LF成分的峰值频率，并通过使用标准的呼吸操作对共振频率进行了评估（Lehrer 2007）。我们对28名健康的大学生和年轻人的HRV和BRS进行了标准呼吸操作（标准条件）确定的，在LF分量峰值频率处的呼吸（频谱条件）和在共振频率处的呼吸频率对BRV和BRS的影响。心电图，呼吸，在5分钟的基线期间记录无创持续血压，然后进行5分钟的有规律的呼吸。结果表明，在两种情况下，呼吸期间BRS均升高，但在“光谱”条件下BRS的升高高于“标准”状态（p  <.05）。在两种情况下的呼吸过程中，LF振幅均增加（p  <.001），尽管两种情况之间的差异并不显着。这些结果表明，在LF成分的峰值频率处有规律地呼吸可以增强自主压力反射功能。此外，在RVV生物反馈过程中，评估LF峰可提供有关共振频率的更准确信息，以便进行有规律的呼吸。