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Table 2 Correlations among measures of heart rate variability and heart rate

From: Effect of an office worksite-based yoga program on heart rate variability: outcomes of a randomized controlled trial

  Log SDNN Log RMSSD pNN50 Log LF power Log HF power Log total power Log LF:HF Resting HR
Log SDNN   0.91* 0.76* 0.75* 0.76* 0.83* −0.23 −0.48*
Log RMSSD    0.81* 0.69* 0.84* 0.83* −0.44* −0.57*
pNN50     0.73* 0.85* 0.82* −0.41* −0.48*
Log LF Power      0.80* 0.92* 0.06 −0.39*
Log HF Power       0.94* −0.56* −0.49*
Log Total Power        −0.28 −0.44*
Log LF:HF         0.27
  1. *p < 0.05; SDNN, standard deviation of the normal-normal interval; RMSSD, root-mean-square of the successive normal sinus RR interval difference; pNN50, percentage of absolute differences between successive normal RR intervals that exceed 50 ms; HF, high frequency power; LF, low frequency power; LF:HF, ratio of low frequency to high frequency power; HR, heart rate.
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