Table 2.
Results of the multiple regression analysis considering differences in HR (HR-diff) and RespRate (RespRate-diff), sex, and age as determinants of differences between Test and Retest in standard HRV parameters.
| Test–Retest difference | Parameters of multiple regression analysis | |||||
|---|---|---|---|---|---|---|
| Determinant | β | p | Multiple R2 | F-test | p | |
| SDNN (ms) | HR-diff | −0.57 | < 0.01 | 0.46 | 6.7 | < 0.001 |
| RespRate-diff | −0.19 | 0.26 | ||||
| Sex | 0.02 | 0.90 | ||||
| Age | −0.05 | 0.70 | ||||
| RMSSD (ms) | HR-diff | −0.64 | < 0.001 | 0.45 | 6.3 | < 0.001 |
| RespRate-diff | −0.03 | 0.85 | ||||
| Sex | −0.06 | 0.69 | ||||
| Age | −0.04 | 0.77 | ||||
| pNN50 (%) | HR-diff | −0.64 | < 0.001 | 0.41 | 5.4 | < 0.01 |
| RespRate-diff | 0.09 | 0.61 | ||||
| Sex | −0.01 | 0.93 | ||||
| Age | −0.01 | 0.97 | ||||
| LF (ms2) | HR-diff | −0.35 | 0.07 | 0.29 | 3.1 | < 0.05 |
| RespRate-diff | −0.25 | 0.19 | ||||
| Sex | −0.02 | 0.90 | ||||
| Age | −0.09 | 0.56 | ||||
| HF (ms2) | HR-diff | −0.35 | 0.06 | 0.34 | 4.1 | < 0.01 |
| RespRate-diff | −0.32 | 0.09 | ||||
| Sex | −0.01 | 0.97 | ||||
| Age | −0.11 | 0.48 | ||||
| TP (ms2) | HR-diff | −0.41 | < 0.05 | 0.41 | 5.4 | < 0.01 |
| RespRate-diff | −0.32 | 0.08 | ||||
| Sex | −0.01 | 0.96 | ||||
| Age | −0.12 | 0.41 | ||||
| nLF (nu) | HR-diff | 0.31 | 0.14 | 0.14 | 1.3 | 0.31 |
| RespRate-diff | 0.02 | 0.94 | ||||
| Sex | 0.001 | 0.99 | ||||
| Age | −0.15 | 0.37 | ||||
| nHF (nu) | HR-diff | −0.31 | 0.14 | 0.14 | 1.3 | 0.31 |
| RespRate-diff | −0.02 | 0.94 | ||||
| Sex | 0.001 | 0.99 | ||||
| Age | 0.15 | 0.37 | ||||
| LF/HF | HR-diff | 0.14 | 0.50 | 0.11 | 1.0 | 0.43 |
| RespRate-diff | 0.11 | 0.62 | ||||
| Sex | −0.11 | 0.55 | ||||
| Age | −0.23 | 0.18 | ||||
All independent variables (Test-Retest differences in HRV parameters) and determinants (HR-diff and RespRate-diff) presented normal distribution.