Raghuraj P, Ramakrishnan A G, Nagendra H R, Telles S
Vivekananda Kendra Yoga Research Foundation, Bangalore.
Indian J Physiol Pharmacol. 1998 Oct;42(4):467-72.
The heart rate variability (HRV) is an indicator of the cardiac autonomic control. Two spectral components are usually recorded, viz. high frequency (0.15-0.50 Hz), which is due to vagal efferent activity and a low frequency component (0.05-0.15 Hz), due to sympathetic activity. The present study was conducted to study the HRV in two yoga practices which have been previously reported to have opposite effects, viz, sympathetic stimulation (kapalabhati, breathing at high frequency, i.e., 2.0 Hz) and reduced sympathetic activity (nadisuddhi, alternate nostril breathing). Twelve male volunteers (age range, 21 to 33 years) were assessed before and after each practice on separate days. The electrocardiogram (lead I) was digitized on-line and off-line analysis was done. The results showed a significant increase in low frequency (LF) power and LF/HF ratio while high frequency (HF) power was significantly lower following kapalabhati. There were no significant changes following nadisuddhi. The results suggest that kapalabhati modifies the autonomic status by increasing sympathetic activity with reduced vagal activity. The study also suggests that HRV is a more useful psychophysiological measure than heart rate alone.
心率变异性（HRV）是心脏自主控制的一个指标。通常记录两个频谱成分，即高频（0.15 - 0.50赫兹），这是由于迷走神经传出活动引起的，以及低频成分（0.05 - 0.15赫兹），由交感神经活动引起。本研究旨在探讨两种先前报道具有相反作用的瑜伽练习中的HRV，即交感神经刺激（圣光调息法，高频呼吸，即2.0赫兹）和交感神经活动降低（经络净化呼吸法，交替鼻孔呼吸）。12名男性志愿者（年龄范围为21至33岁）在不同日期的每次练习前后进行评估。心电图（I导联）进行在线数字化并进行离线分析。结果显示，在圣光调息法之后，低频（LF）功率和LF/HF比值显著增加，而高频（HF）功率显著降低。在经络净化呼吸法之后没有显著变化。结果表明，圣光调息法通过增加交感神经活动和降低迷走神经活动来改变自主神经状态。该研究还表明，HRV是一种比单独心率更有用的心理生理测量指标。
