Patanjali Research Foundation, Patanjali Yogpeeth, Haridwar, India.
Biopsychosoc Med. 2011 Apr 13;5:4. doi: 10.1186/1751-0759-5-4.
Pre and post comparison after one minute of high frequency yoga breathing (HFYB) suggested that the HFYB modifies the autonomic status by increasing sympathetic modulation, but its effect during the practice was not assessed.
Thirty-eight male volunteers with group average age ± S.D., 23.3 ± 4.4 years were each assessed on two separate days in two sessions, (i) HFYB and (ii) breath awareness. Each session was for 35 minutes, with 3 periods, i.e., pre (5 minutes), during HFYB or breath awareness (15 minutes) and post (5 minutes).
There was a significant decrease in NN50, pNN50 and the mean RR interval during and after HFYB and after breath awareness, compared to the respective 'pre' values (p < 0.05) (repeated measures ANOVA followed by post-hoc analysis). The LF power increased and HF power decreased during and after breath awareness and LF/HF ratio increased after breath awareness (p < 0.05).
The results suggest that there was reduced parasympathetic modulation during and after HFYB and increased sympathetic modulation with reduced parasympathetic modulation during and after breath awareness.
高频瑜伽呼吸（HFYB）一分钟前后的比较表明，HFYB 通过增加交感神经调节来改变自主神经状态，但在练习过程中其效果尚未评估。
38 名男性志愿者，平均年龄为 23.3 ± 4.4 岁，在两天的两次会议中分别进行评估，（i）HFYB 和（ii）呼吸意识。每次会议持续 35 分钟，有 3 个周期，即前（5 分钟）、HFYB 或呼吸意识期间（15 分钟）和后（5 分钟）。
与各自的“前”值相比，HFYB 期间和之后以及呼吸意识之后，NN50、pNN50 和平均 RR 间隔显著降低（p < 0.05）（重复测量方差分析后进行事后分析）。LF 功率在呼吸意识期间和之后增加，HF 功率降低，LF/HF 比值在呼吸意识之后增加（p < 0.05）。
结果表明，HFYB 期间和之后副交感神经调节减少，而呼吸意识期间和之后交感神经调节增加，副交感神经调节减少。
