Table 3. Associations between cardiovascular risk factors and heart rate variability assessed by fast Fourier transform and autoregressive methods in adolescent’s boys.
| Cardiovascular risk factors | Total power (ms2) | LF (n.u.) | HF (n.u.) | LF/HF | ||||
|---|---|---|---|---|---|---|---|---|
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| FFT | AR | FFT | AR | FFT | AR | FFT | AR | |
| Systolic BP (mmHg) | -0.114 (<0.001) | -0.115 (<0.001) | -0.171 (<0.001) | 0.175 (<0.001) | -0.171 (<0.001) | -0.175 (<0.001) | 0.162 (<0.001) | 0.155 (<0.001) |
| BMI (kg/m2) | -0.033 (0.262) | -0.028 (0.351) | -0.113 (<0.001) | 0.098 (0.001) | -0.113 (<0.001) | -0.098 (0.001) | 0.098 (0.001) | 0.079 (0.007) |
| WC (c) | -0.048 (0.102) | -0.046 (0.121) | 0.126 (<0.001) | 0.109 (<0.001) | -0.126 (<0.001) | -0.109 (<0.001) | 0.109 (<0.001) | 0.091 (0.002) |
Data presented as Pearson’s correlation coefficients (p value).
LF: low frequency; HF: high frequency; FFT: fast Fourier transform; AR: autoregressive; BP: blood pressure; BMI: body mass index; WC: waist circumference; n.u: normalized units.