| DFA a1 | short-term scaling exponent of Detrended Fluctuation Analysis |
| HR | Heart rate |
| HRV | Heart rate variability |
| ECG | electrocardiogram |
| LOA | Bland Altman limits of agreement |
| R2 | coefficient of determination |
| RMSSD | square root of the mean squared differences of the successive RR intervals |
| RR interval | the time between two successive R-waves of the QRS signal on the ECG |
| SDNN | standard deviation of RR intervals |
| SEE | standard error of estimate |
| V˙O2MAX | maximal oxygen consumption |
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