Breathing at the resonance frequency (~ 6 breaths per min) produces resonance effects on baroreflex gain, blood pressure, vascular tone, and therapeutic benefits. Evgeny Vaschillo and Paul Lehrer have emphasized that the stimulation frequency is critical for producing resonance effects in the cardiorespiratory system. Although clinicians overwhelmingly use paced breathing to increase HRV, other promising methods exist. Vaschillo, Lehrer, and colleagues have shown that presenting non-respiratory stimulation at 0.1 Hz—pictures with an emotional valence or rhythmical muscle tensing—amplifies oscillations in heart rate, blood pressure, and vascular tone. Participants in the present study included 49 undergraduate students randomly assigned to one of six different orders of 5-min trials of 1, 6, and 12 muscle contractions per min (cpm), separated by 3-min buffer periods intended to minimize carryover. This randomized controlled trial replicated the Vaschillo et al. (Psychophysiology 48:927–936, 2011. https://doi.org/10.1111/j.1469-8986.2010.01156.x) finding that 6-cpm RSMT can produce a PkFreq of ~ 0.10 Hz, similar to 6-bpm RF breathing. RSMT at 1 and 6 cpm increased five time-domain metrics (HR Max–HR Min, RMSSD, SDNN, TI, and TINN), one frequency-domain metric (LF power), and three non-linear metrics (D2, SD1, SD2) significantly more than RSMT at 12 cpm. There were no differences between 1 and 6 cpm on these measures. The 1-cpm rate (~ 0.02 Hz) may have stimulated the hypothesized vascular tone baroreflex between 0.02 and 0.055 Hz. RSMT at 1 or 6 cpm provides clients with an alternative exercise for increasing HRV for patients who find slow-paced breathing challenging or medically unsafe.

以共振频率（每分钟约 6 次呼吸）呼吸会对压力反射增益、血压、血管张力和治疗益处产生共振效应。Evgeny Vaschillo 和 Paul Lehrer 强调，刺激频率对于在心肺系统中产生共振效应至关重要。尽管临床医生绝大多数使用有节奏的呼吸来增加 HRV，但存在其他有希望的方法。Vaschillo、Lehrer 及其同事已经证明，以 0.1 Hz 的频率呈现非呼吸刺激（具有情绪效价或有节奏的肌肉紧张的图片）会放大心率、血压和血管张力的波动。本研究的参与者包括 49 名本科生，他们被随机分配到六种不同的 5 分钟试验中的一种，每分钟 1、6 和 12 次肌肉收缩 (cpm)，间隔 3 分钟的缓冲期，以尽量减少残留。这项随机对照试验复制了 Vaschillo 等人的研究。(Psychophysiology 48:927–936, 2011. https://doi.org/10.1111/j.1469-8986.2010.01156.x) 发现 6-cpm RSMT 可以产生约 0.10 Hz 的 PkFreq，类似于 6-bpm射频呼吸。1 和 6 cpm 的 RSMT 增加了五个时域指标（HR Max–HR Min、RMSSD、SDNN、TI 和 TINN）、一个频域指标（LF 功率）和三个非线性指标（D2、SD1、 SD2) 在 12 cpm 时明显高于 RSMT。这些措施在 1 和 6 cpm 之间没有差异。1-cpm 速率 (~ 0.02 Hz) 可能在 0.02 和 0.055 Hz 之间刺激了假设的血管张力压力反射。