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. 2008 May 27;7(2):59–65. doi: 10.1016/j.jcme.2008.02.004

Table 2.

Heart rate variability analysis of the experimental group over a 4-week period

Mean NN Mean HRT SDNN RMSSD Total Power VLF LF HF LFNorm HFNorm LF/HF
Baseline
 Mean 777.317 78.0799 56.9948 44.94924 1072.053 334.4977 517.5409 220.0145 76.04153 23.95848 4.580123
 SD 83.32889 9.069486 27.97229 27.16118 880.0112 251.287 439.3095 283.4354 13.14943 13.14943 3.174537
Fourth week
 Mean 759.3806 80.63403 63.39133 57.64812 1509.88 571.5804 573.9766 364.3227 67.23875 32.76124 3.450067
 SD 113.3062 11.89603 36.0342 42.825 1881.797 766.9527 700.687 764.5625 20.62019 20.62019 2.732027
t Test 0.527654 0.386982 0.286636 0.093633 0.272592 0.255567 0.696424 0.404808 0.167124 0.167125 0.362522

Mean NN, normal to normal; HRT, heart rate; SDNN, standard deviation of normal to normal interval; RMSSD, square root of the mean squared differences of successive NN interval; VLF, very low frequency; LF, low frequency; HF, high frequency; LFNorm, normalized low frequency; HFNorm, normalized high frequency.