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)
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 |