Table 3.
Arterial baroreflex function
| Variable | Normotensive (n = 13) | Prehypertensive (n = 9) | p |
|---|---|---|---|
| SBP-iRR | |||
| LF Central frequency (Hz) | 0,10 ± 0,02 | 0,10 ± 0,01 | 0,58a |
| LF Phase shift (rad) | -0,96 ± 0,33 | - 0,94 ± 0,31 | 0,90a |
| LF Coherence | 0,85 ± 0,08 | 0,79 ±0,14 | 0,15a |
| Resp-iRR | |||
| LF Central frequency (Hz) | 0,14 [0,10-0,15] | 0,10 [0,07-0,12] | 0,08b |
| LF Coherence | 0,47 ± 0,19 | 0,42 ± 0,16 | 0,56a |
| Central frequency HF (Hz) | 0,29 [0,28-0,30] | 0,32 [0,27-0,33] | 0,42b |
| HF Coherence | 0,96 [0,91-0,98] | 0,93 [0,92-0,95] | 0,22b |
Data presented as mean ± standard deviation of mean or median [interquartile range];
a
unpaired Student t test;
b
Mann-Whitney U-test; iRR-RR interval; SBP: systolic blood pressure; LF: low frequency; HF: high frequency.