Table 1.
Correlations of standard time- and frequency-domain HRV parameters with heart rate, respiratory rate, age, and body mass index.
| Standard HRV parameter | HR [bpm] | RespRate [breaths/min] | Age [years] | BMI [kg/m2] | ||||
|---|---|---|---|---|---|---|---|---|
| R | p | R | p | R | p | R | p | |
| SDNN [ms] | -0.64 | -0.41 | -0.03 | 0.61 | -0.04 | 0.52 | ||
| RMSSD [ms] | -0.72 | -0.37 | <-0.01 | 0.99 | -0.04 | 0.45 | ||
| pNN50 [%] | -0.75 | -0.36 | 0.02 | 0.72 | -0.04 | 0.54 | ||
| FFT VLF [ms2] | -0.42 | -0.22 | -0.07 | 0.23 | 0.04 | 0.50 | ||
| FFT LF [ms2] | -0.53 | -0.31 | -0.04 | 0.49 | <0.01 | 0.97 | ||
| FFT HF [ms2] | -0.60 | -0.44 | -0.06 | 0.29 | -0.07 | 0.22 | ||
| FFT TP1 (VLF+LF+HF) [ms2] | -0.60 | -0.41 | -0.06 | 0.28 | -0.04 | 0.46 | ||
| FFT TP2 (LF+HF) [ms2] | -0.60 | -0.41 | -0.06 | 0.31 | -0.05 | 0.42 | ||
| FFT LF/HF | 0.25 | 0.26 | 0.05 | 0.36 | 0.10 | 0.08 | ||
| FFT nLF [nu] | 0.25 | <0.001 | 0.26 | <0.001 | 0.05 | 0.36 | 0.10 | 0.08 |
| FFT nHF [nu] | -0.25 | -0.26 | -0.05 | 0.36 | -0.10 | 0.08 | ||
| AR VLF [ms2] | -0.56 | -0.33 | -0.08 | 0.19 | -0.02 | 0.68 | ||
| AR LF [ms2] | -0.56 | -0.34 | -0.02 | 0.77 | 0.01 | 0.81 | ||
| AR HF [ms2] | -0.63 | -0.45 | -0.03 | 0.57 | -0.06 | 0.28 | ||
| AR TP1 (VLF+LF+HF) [ms2] | -0.63 | -0.43 | -0.03 | 0.64 | -0.03 | 0.57 | ||
| AR TP2 (LF+HF) [ms2] | -0.63 | -0.43 | -0.02 | 0.67 | -0.03 | 0.55 | ||
| AR LF/HF | 0.26 | 0.25 | 0.05 | 0.36 | 0.10 | 0.06 | ||
| AR nLF [nu] | 0.26 | 0.25 | 0.05 | 0.36 | 0.10 | 0.06 | ||
| AR nHF [nu] | -0.26 | -0.25 | -0.05 | 0.37 | -0.10 | 0.06 | ||
FFT denotes that a given HRV parameter was calculated by using Fast Fourier Transform, while AR indicates that the HRV spectrum was calculated with autoregressive method. R, Spearman’s rank correlation coefficient.