Cerebral Hemodynamics and Vagally Mediated HRV Associated with High- and Low-frequency Yoga Breathing: An Exploratory, Randomized, Crossover Study.

IF 1.1 Q3 INTEGRATIVE & COMPLEMENTARY MEDICINE
International Journal of Yoga Pub Date : 2024-01-01 Epub Date: 2024-05-13 DOI:10.4103/ijoy.ijoy_197_23
Chetan Aacharya, Shirley Telles, Sachin Kumar Sharma
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引用次数: 0

Abstract

Background: Volitionally modifying respiration leads to changes in middle cerebral arterial (MCA) blood flow. The effect of changes in breath rate on MCA blood flow has not been reported.

Aims and objectives: To determine the effect of slow (bumblebee yoga breathing) and fast (high frequency yoga breathing) yoga breathing techniques on MCA blood flow and vagally mediated heart rate variability.

Materials and methods: Thirty participants (mean age ± standard deviation, 27.3 ± 4.2 years) were assessed on 2 separate days practicing either high frequency yoga breathing (HFYB, breath frequency 54.2/min) or slow frequency bumblebee yoga breathing (BBYB, breath frequency 3.8/min) in random order to determine the effects of changes in breath frequency on MCA hemodynamics. Assessments included transcranial Doppler sonography, vagally mediated heart rate variability (VmHRV), and respiration.

Results: Both HFYB and BBYB (i) reduced MCA flow velocities, i.e., peak systolic, end diastolic, and mean flow velocities, and (ii) increased MCA pulsatility indices. There was an increase in VmHRV during BBYB based on increased power in high frequency (HF) and low frequency (LF). LF reflects VmHRV for slow breath frequencies. In BBYB the average breath rate was 3.8 breaths/min. In contrast, VmHRV decreased during HFYB (based on reduced HF power; repeated measures analysis of variance, P < 0.05, all cases).

Conclusion: Hence, irrespective of the differences in breath frequency, both HFYB and BBYB appear to reduce MCA flow velocities and increase the resistance to blood flow bilaterally, although the VmHRV changed in opposite directions. MCA velocity and pulsatility changes are speculated to be associated with low global neural activity during yoga breathing.

与高频和低频瑜伽呼吸相关的脑血流动力学和吟唱式心率变异:一项探索性、随机、交叉研究。
背景:随意改变呼吸会导致大脑中动脉(MCA)血流发生变化。呼吸频率的变化对大脑中动脉血流的影响尚未见报道:确定慢速(大黄蜂瑜伽呼吸)和快速(高频瑜伽呼吸)瑜伽呼吸技术对 MCA 血流和迷走神经介导的心率变异性的影响:30 名参与者(平均年龄 ± 标准差,27.3 ± 4.2 岁)分别在 2 天内以随机顺序练习高频瑜伽呼吸(HFYB,呼吸频率 54.2/分钟)或慢频大黄蜂瑜伽呼吸(BBYB,呼吸频率 3.8/分钟),以确定呼吸频率的变化对 MCA 血流动力学的影响。评估包括经颅多普勒超声检查、迷走神经介导的心率变异性(VmHRV)和呼吸:结果:HFYB 和 BBYB 均(i)降低了 MCA 流速,即收缩期峰值、舒张末期流速和平均流速;(ii)增加了 MCA 搏动指数。基于高频(HF)和低频(LF)功率的增加,BBYB 期间 VmHRV 增加。低频反映了慢呼吸频率的 VmHRV。在 BBYB 中,平均呼吸频率为 3.8 次/分钟。与此相反,HFYB 期间的 VmHRV 有所下降(基于降低的高频功率;重复测量方差分析,P < 0.05,所有情况):因此,无论呼吸频率有何不同,HFYB 和 BBYB 似乎都会降低 MCA 流速并增加双侧血流阻力,尽管 VmHRV 的变化方向相反。据推测,MCA 流速和搏动性的变化与瑜伽呼吸时整体神经活动较低有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Yoga
International Journal of Yoga INTEGRATIVE & COMPLEMENTARY MEDICINE-
自引率
12.50%
发文量
37
审稿时长
24 weeks
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