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Table 2 Breath rate and HRV measures in breath awareness sessions.

From: Heart rate variability changes during high frequency yoga breathingand breath awareness

Variables Pre During 1 During 2 During 3 Post 1 Post 2 Post 3
Breath rate (breaths/min) 15.39 ± 3.52 14.61 ± 3.80 15.03 ± 3.79 14.93 ± 3.76 16.13 ± 3.32 16.24 ± 3.33 16.20 ± 3.74
LF (nu) 71.09 ± 3.30 72.08 ± 3.43 72.52 ± 3.50 72.63 ± 2.62* 72.39 ± 2.80 72.73 ± 2.21* 72.81 ± 2.49*
HF (nu) 28.91 ± 3.30 27.92 ± 3.43 27.48 ± 3.50 27.37 ± 2.62* 27.61 ± 2.80 27.27 ± 2.21* 27.19 ± 2.49*
LF/HF (nu) 2.50 ± 0.36 2.63 ± 0.43 2.70 ± 0.48 2.69 ± 0.38 2.66 ± 0.35 2.69 ± 0.30 2.71 ± 0.32**
Mean RR (sec) 1.01 ± 0.17 1.01 ± 0.16 1.00 ± 0.16 1.00 ± 0.16 0.98 ± 0.15* 0.95 ± 0.15*** 0.94 ± 0.15***
NN50 (count) 139.95 ± 55.77 137.97 ± 51.33 134.87 ± 54.23 133.53 ± 51.92 127.00 ± 51.98 122.03 ± 53.62 110.21 ± 59.33**
pNN50 (%) 48.69 ± 21.62 47.09 ± 19.85 46.07 ± 21.05 45.45 ± 20.61 42.74 ± 20.34 39.31 ± 20.57** 35.69 ± 21.71***
  1. *p < 0.05, **p < 0.01 and ***p < 0.001, Repeated measures analyses of Variance (RMANOVA), with post-hoc analyses comparing During and Post