| EWMA | Exponentially Weighted Moving Average |
| HR | Heart Rate |
| HRV | Heart Rate Variability |
| LnRMSSD | Natural Logarithm of the Root Mean Square of Successive Differences |
| MD | Match Day |
| NTD | Non-Training Day |
| PPG | Photoplethysmograph |
| RMSE | Root Mean Squared Error |
| RMSSD | Root Mean Square of Successive Differences |
| RPE | Rate of Perceived Exertion |
| SHAP | SHapley Additive exPlanation |
| sRPE | Session Rate of Perceived Exertion |
| TD | Training Day |
| XGBoost | Extreme Gradient Boosting |
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