Correlation of baroreflex sensitivity with heart rate variability
| Variability index | DT-BRS (r value) | Phe-BRS (r value) |
| LF (rest) | 0.6562-165 | 0.6852-165 |
| HF (rest) | 0.5632-160 | 0.5242-160 |
| LF/HF (rest) | 0.078 | 0.201 |
| LF (tilt) | 0.5832-160 | 0.5652-160 |
| HF (tilt) | 0.211 | 0.188 |
| LF/HF (tilt) | 0.5412-160 | 0.5162-160 |
| ΔLF | 0.5502-150 | 0.7452-150 |
| ΔHF | 0.5742-160 | 0.5322-160 |
| ΔLF/HF | 0.5672-160 | 0.4952-150 |
Values are correlation coefficients of the linear regression analysis between downward tilt baroreflex sensitivity measurement (DT-BRS) and conventional phenylephrine assessment (Phe-BRS) versus indices of heart rate variability.
↵2-150 p < 0.01,
↵2-160 p < 0.005,
↵2-165 p < 0.0001.
LF and HF, low and high frequency components of heart rate variability; ΔLF, ΔHF, and ΔLF/HF, the difference between rest and tilt values of LF, HF, and LF/HF, respectively. Measured values of LF and HF were transformed by a natural logarithm.