N=10 SDNN (ms) RMSSD (ms) HR (bpm) LFP (ms2) % LF
Pre 1 62.9 ± 21.2[SD] 56.0 ± 25.6 82.8 ± 11.3 1348 ± 1468 40.3 ± 20.5
Post 1 96.7 ± 37.9* 84.8 ± 46.4 79.5 ± 11.3 3843 ± 3561 49.2 ± 22.0
Pre 2 53.2 ± 28.4 47.3 ± 24.1 84.4 ± 14.1 691 ± 624 32.4 ± 19.5
Post 2 90.4 ± 36.4 78.4 ± 36.1 77.8 ± 10.1 6701 ± 6947 59.5 ± 25.4
Pre 3 54.8 ± 22.0 44.8 ± 22.7 84.4 ± 10.6 981 ± 949 35.3 ± 20.9
Post 3 75.4 ± 33.5* 55.1 ± 34.6 82.0 ± 12.7 3796 ± 3456* 60.0 ± 23.7*
N=6 SDNN (ms) RMSSD (ms) HR (BPM) LFP (ms2) % LF
Pre 1 65.6 ± 23.2 50.2 ± 25.7 79.5 ± 12.4 1702 ± 1848 39.4 ± 25.8
Post 1 85.4 ± 56.3 96.6 ± 55.2 81.4 ± 15.4 4601 ± 4537 49.0 ± 20.2
Pre 2 61.9 ± 33.1 53.4 ± 26.5 79.3 ± 15.5 879 ± 732 34.4 ± 23.5
Post 2 99.8 ± 35.1 81.8 ± 37.6 74.3 ± 12.8 7610 ± 6183 67.8 ± 24.2
Pre 3 57.7 ± 19.8 42.1 ± 22.4 81.9 ± 10.0 1269 ± 1107 42.0 ± 25.3
Post 3 75.0 ± 27.7 47.7 ± 23.0 80.5 ± 15.7 4166 ± 3220 70.3 ± 24.4
Pre 4 75.3 ± 37.9 69.3 ± 48.0 82.3 ± 17.0 1882 ± 1240 39.0 ± 26.4
Post 4 104.7 ± 44.9 71.1 ± 35.9 76.9 ± 12.4 10169 ± 6617* 81.1 ± 7.5*
Autonomic parameters were defined as follows: SDNN [standard deviation of IBI in milliseconds], RMSSD [root mean squared root of standard differences in milliseconds], HR [heart rate in beats per minute], LFP [low frequency power in milliseconds squared], and % LF [percentage low frequency power].
All values are expressed as mean ± standard deviation (SD)
* p < 0.05 comparing pre-session versus post-session
** p< 0.05 comparing pre-session 1 versus post-session 3 or 4
Table 1: Changes in HRV in subjects who attended 3 or 4 yoga sessions.