Table 3.
Heart rate variability (HRV), baroreflex sensitivity, and blood pressure changes by quartile of low-frequency (LF) power.
| Quartile 1 |
Quartile 2 |
Quartile 3 |
Quartile 4 |
|||||
|---|---|---|---|---|---|---|---|---|
| V1 | V2 | V1 | V2 | V1 | V2 | V1 | V2 | |
| Ln LF | 4.3 | 5.0 | 5.8 | 6.0 | 6.6 | 6.6 | 7.8 | 7.5 |
| Ln HF | 4.3 | 4.9 | 5.4 | 5.5 | 6.2 | 6.2 | 7.1 | 7.3 |
| Ln TP | 5.2 | 5.7 | 6.4 | 6.5 | 7.2 | 7.2 | 8.3 | 8.2 |
| UP SBP | 8.2 (5.6) | 10.8 (7.1) | 10.9 (6.5) |  |
17.3 (9.1) | 20.0 (14.8) | 26.0 (14.8) |  |
| DOWN SBP | 8.5 (4.7) |  |
11.6 (6.6) | 15.7 (8.8) | 16.2 (8.9) | 18.8 (14.0) | 21.6 (10.0) |  |
| ALL SBP | 7.9 (4.5) |  |
11.1 (5.7) |  |
16.4 (8.0) | 20.2 (14.3) | 24.0 (11.2) |  |
| SDNN | 24.7 (9.9) |  |
36.2 (7.9) | 42.4 (17.0) | 47.0 (13.3) | 52.3 (21.2) | 69.4 (17.8) |  |
| RMSSD | 18.1 (12.5) |  |
24.6 (11.7) |  |
37.3 (18.2) | 40.9 (21.8) | 61.8 (23.7) |  |
| Heart rate | 72.2 (17.5) | 69.6 (9.4) | 70.9 (11.1) | 70.7 (11.6) | 70.7 (9.2) | 71.3 (10.4) | 59.3 (8.4) | 59.3 (7.8) |
| SAP | 127.8 (18.5) | 125.8 (15.2) | 126.3 (19.7) |  |
122.1 (16.4) | 119.7 (15.4) | 120.0 (20.0) | 119.2 (17.3) |
| MAP | 95.3 (18.5) | 92.9 (10.5) | 94.9 (11.7) | 89.9 (12.0) | 91.6 (12.3) | 88.9 (10.2) | 90.4 (13.4) | 87.4 (8.4) |
| DAP | 78.0 (9.9) | 75.4 (9.9) | 77.9 (9.7) | 75.1 (11.1) | 76.1 (11.5) | 73.3 (10.5) | 75.0 (11.9) | 71.3 (8.9) |
Pre- and post-intervention values are shown for subjects with lower (quartiles 1 and 2) and higher (quartiles 3 and 4) baseline levels of LF HRV power. LF, high frequency, and total power values are shown as natural logarithms of the absolute power values. SDs are indicated in parentheses. Statistically significant differences between pre- and post-interventional values are shown with colored font (blue for 0.01 ≤ p ≤ 0.05; red for p < 0.01).