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Table 3 Frequency, time and nonlinear domain analysis of heart rate variability parameters across QRS groups (non-diabetes, no history of hypertension and no self reported cardiovascular conditions)

From: Systolic blood pressure but not electrocardiogram QRS duration is associated with heart rate variability (HRV): a cross-sectional study in rural Australian non-diabetics

  QRS duration (ms) p-value
80–100 (n = 66) >100–120 (n = 26) >120 (n = 4)  
n mean (SD) n mean (SD) n mean (SD)
Frequency domain, mean (SD)
 Total power (ms2) 61 1342.9 (833.9) 24 1280.8 (752.3) 4 1428.5 (446.3) 0.92
 HF (ms2) 55 203.1 (130.3) 24 186.3 (133.2) 4 217.5 (114.7) 0.83
 LF (ms2) 56 303.1 (194.8) 24 335.7 (192.4) 4 349.8 (255.6) 0.74
 HF In 57 5.3 (1) 21 5.2 (0.9) 2 5.5 (0.5) 0.89
 LF In 57 5.7 (0.9) 21 5.8 (0.7) 2 5.4 (1.3) 0.76
 HF norm (v) 66 42.5 (15.6) 26 37.9 (18.4) 4 43 (27.2) 0.49
 LF norm (v) 66 56.6 (15.5) 26 62.8 (18.9) 4 44.6 (11.3) 0.072
 LF/HF ratio 60 1.4 (0.7) 22 1.8 (1.1) 3 0.9 (0.5) 0.059
Time domain, mean (SD)
 SDNN (ms) 64 39.8 (12.8) 26 39.3 (13.8) 4 46.5 (17) 0.59
 RMSDD (ms) 61 25.7 (9) 25 23.5 (7.9) 3 27.4 (8.3) 0.52
Nonlinear analysis
 DFA α1 66 1.1 (0.2) 26 1.2 (0.2) 4 1.1 (0.3) 0.12
 DFA α2 64 1.0 (0.2) 26 1.0 (0.2) 4 0.9 (0.1) 0.29
 DFA32 0   0   0   
 ApEN 65 1.3 (0.1) 26 1.2 (0.2) 4 1.2 (0.1) 0.19
  1. SD standard deviation, HF high frequency, LF low frequency, norm normalized, SDNN standard deviation of R-R intervals, RMSDD root mean square of successive difference of RR, DFA detrended fluctuation analysis, ApEN approximate entropy