Hotho Gerard, von Bonin Dietrich, Krüerke Daniel, Wolf Ursula, Cysarz Dirk
Biologisch Onderzoek Gennep, Eindhoven, Netherland.
Research Department, Clinic Arlesheim, Arlesheim, Switzerland.
Front Physiol. 2022 May 10;13:875583. doi: 10.3389/fphys.2022.875583. eCollection 2022.
Slow breathing at 0.1 Hz (i.e., 6 cycles per minute, cpm) leads to strong cardiovascular oscillations. However, the impact of breathing below 6 cpm is rarely addressed. We investigated the influence of OM chanting, an ancient Indian mantra, with approx. 3 respiratory cpm (0.05 Hz) on the synchronisation of heart period (RR), respiration (RESP) and systolic blood pressure (SBP). Nine healthy, trained speech practitioners chanted three sequences of five subsequent OM with 2 min pauses in between. Each single OM chanting consisted of taking a deep breath and a long "OM" during expiration and lasted approx. 20 s. ECG, respiration and blood pressure were recorded continuously, of which the RR tachogram, RESP and SBP were derived. Synchronisation between the signals was computed using the phase difference between two signals. During OM chanting synchronisation among the oscillations of RR, SBP and RESP was significantly increased compared to rest. Furthermore, OM chanting at breathing frequencies between 0.046 and 0.057 Hz resulted in 0.1 Hz oscillations in RR and SBP. In conclusion, OM chanting strongly synchronized cardiorespiratory and blood pressure oscillations. Unexpected oscillations at 0.1 Hz in SBP and RR appear at breathing frequencies of approx. 0.05 Hz. Such frequency doubling may originate from an interaction of breathing frequency with endogenous Mayer waves.
以0.1赫兹（即每分钟6个周期，cpm）的频率进行慢呼吸会导致强烈的心血管振荡。然而，每分钟呼吸次数低于6次的影响却很少被提及。我们研究了古老的印度咒语——唱诵“唵”，其呼吸频率约为3次/分钟（0.05赫兹）对心动周期（RR）、呼吸（RESP）和收缩压（SBP）同步性的影响。九名健康且训练有素的语音练习者连续唱诵三个包含五次“唵”的序列，每次序列之间有2分钟的停顿。每次单独的唱诵“唵”包括深呼吸以及呼气时发出长长的“唵”音，持续约20秒。连续记录心电图、呼吸和血压，并从中得出RR心动图、RESP和SBP。使用两个信号之间的相位差来计算信号之间的同步性。与休息时相比，唱诵“唵”时RR、SBP和RESP振荡之间的同步性显著增加。此外，在0.046至0.057赫兹的呼吸频率下唱诵“唵”会导致RR和SBP出现0.1赫兹的振荡。总之，唱诵“唵”能强烈同步心肺和血压振荡。在约0.05赫兹的呼吸频率下，SBP和RR会出现意外的0.1赫兹振荡。这种频率翻倍可能源于呼吸频率与内源性迈尔波的相互作用。
