Table 5 Linear regression analysis between SBP and HRV (both as continuous variables) - among “healthy” individuals (without diabetes, hypertension or self reported cardiovascular conditions)
Heart rate variability | SBP | |||
|---|---|---|---|---|
Univariate | Multivariate (adjusted for age) | |||
Coefficient (r) | p-value | Coefficient (r) | p-value | |
Frequency domain, mean (SD) | ||||
Total power (ms2) | −0.001 | 0.59 | −0.001 | 0.67 |
HF (ms2) | −0.02 | 0.05 | −0.015 | 0.13 |
LF (ms2) | −0.01 | 0.28 | −0.043 | 0.51 |
HF In | −2.65 | 0.017 | −1.67 | 0.12 |
LF In | −1.06 | 0.42 | 0.15 | 0.91 |
HF norm (v) | −0.97 | 0.18 | −0.085 | 0.23 |
LF norm (v) | 0.13 | 0.07 | 0.11 | 0.11 |
LF/HF ratio | 3.52 | 0.026 | 2.79 | 0.064 |
Time domain, mean (SD) | ||||
SDNN (ms) | −0.09 | 0.31 | −0.029 | 0.74 |
RMSDD (ms) | −0.31 | 0.013 | −0.23 | 0.051 |
Nonlinear analysis | ||||
DFA α1 | 1.65 | 0.74 | 0.58 | 0.9 |
DFA α2 | 7.11 | 0.37 | 0.55 | 0.94 |
DFA32 | −0.033 | 0.6 | 0.031 | 0.59 |
ApEN | −25.1 | <0.001 | −20.55 | 0.001 |