Heart rate variability | Systolic blood pressure (mm Hg) | ||||||||
---|---|---|---|---|---|---|---|---|---|
70–120 (n = 82) | 121–130 (n = 43) | 131–145 (n = 39) | 146–220 (n = 14) | p-value | |||||
n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | ||
Frequency domain, mean (SD) | |||||||||
Total power (ms2) | 69 | 1282.4 (750.7) | 38 | 1622.8 (843.6) | 34 | 1046.5 (640.2) | 13 | 1326 (810.5) | 0.016 |
HF (ms2) | 65 | 197.3 (135.1) | 36 | 222.9 (130.5) | 34 | 140.6 (108.1) | 14 | 162.8 (136.2) | 0.046 |
LF (ms2) | 69 | 321.9 (203.4) | 36 | 320.9 (190.2) | 33 | 234 (166.8) | 14 | 305.3 (214.3) | 0.21 |
HF In | 77 | 5.4 (1.1) | 40 | 5.5 (0.9) | 33 | 4.8 (1.1) | 12 | 4.7 (1.0) | 0.0064 |
LF In | 78 | 5.8 (1.0) | 40 | 5.8 (0.9) | 32 | 5.5 (0.9) | 12 | 5.6 (0.7) | 0.54 |
HF norm (v) | 81 | 40.6 (16.1) | 43 | 42.1 (16) | 39 | 38.3 (18.4) | 14 | 31.4 (13.4) | 0.17 |
LF norm (v) | 82 | 57.1 (16.4) | 43 | 55.2 (15.3) | 39 | 60.2 (18.7) | 14 | 66.8 (12.8) | 0.10 |
LF/HF ratio | 71 | 1.39 (0.7) | 39 | 1.4 (0.8) | 32 | 1.6 (0.9) | 11 | 2.1 (1.0) | 0.029 |
Time domain, mean (SD) | |||||||||
SDNN (ms) | 79 | 40.9 (14.1) | 43 | 44.6 (13.1) | 38 | 36.8 (13.1) | 14 | 38.5 (13.9) | 0.077 |
RMSDD (ms) | 75 | 25.8 (10.5) | 40 | 27 (8.9) | 37 | 21.9 (9.8) | 13 | 19.6 (8.9) | 0.025 |
Nonlinear analysis | |||||||||
DFA α1 | 82 | 1.1 (0.2) | 43 | 1.0 (0.3) | 39 | 1.1 (0.3) | 14 | 1.1 (0.2) | 0.55 |
DFA α2 | 82 | 0.9 (0.2) | 43 | 1.0 (0.2) | 36 | 1.0 (0.1) | 14 | 1.0 (0.1) | 0.68 |
DFA32 | 32 | 92.6 (31.5) | 22 | 87.9 (30.9) | 11 | 82.4 (31.1) | 8 | 88 (27.2) | 0.81 |
ApEN | 81 | 1.26 (0.14) | 39 | 1.18 (0.18) | 36 | 1.16 (0.22) | 12 | 1.06 (0.22) | 0.001 |