Table 1. Internal and External Load Metrics used in the model.
Metric Name Abbreviation Description
Distance DTOT Total distance covered
Sprints Sprints Total number of sprints
Accelerations Acc Total number of accelerations above 2 m/s2
Decelerations Dec Total number of decelerations above 2 m/s2
High speed running HSR Total distance covered with running speed above 19.8 km/h
Sprint Distance DSprint The distance covered with running speed above 25.2 km/h
Training Load score TL score A numerical transformation of the Cardio and muscle load provided by the Polar software
Time in Heart Rate zone 80-90 THR 80-90 Time in seconds in Zone 4 (i.e., 80 to 90% of maximum heart rate)
Time in Heart Rate zone 90-100 THR 90-100 Time in seconds in Zone 5 (i.e. 90 to 100% of maximum heart rate)