3 61 MACHINE LEARNING SUPPORTING SUBSTITUTIONS IN SOCCER throughout the match. The visualization of the distance covered is represented in Figure 3. The average distance covered declined over time from 5275 ± 223m in the first half to 4906 ± 225m in the second half (P < 0.001, ε2 = 0.43). The visualization of the distance in speed category of the entire match players can be found in Figure 4. The distance covered in speed category showed a decline in the average distance in the speed category LIR from 2345 ± 170m in the first half to 2092 ± 148m in the second half (P < 0.001, ε2 = 0.43), MIR from 888 ± 87m in the first half to 792 ± 77m in the second half (P < 0.001, ε2 = 0.26), and HIR from 290 ± 38m in the first half to 268 ± 35m in the second half (P < 0.001, ε2 = 0.08). VLIR increased during the second half from 564 ± 66m in the first 15 minutes to 603 ± 69m in the last 15 minutes (P < 0.001, ε2 = 0.05), and the distance covered in the speed categories HIR and VHIR almost stay stable during the entire match. The descriptives of the distance in power category of the entire match players are visualized in Figure 5. The energy expenditure in power category shows a decline in the average energy expenditure in the power categories IP from 7.26 ± 1.24kJ kg-1 in the first half to 6.47 ± 1.14kJ kg-1 in the second half (P < 0.001, ε2 = 0.75), HP from 3.52 ± 0.76kJ kg-1 in the first half to 3.13 ± 0.67kJ kg-1 in the second half (P < 0.001, ε2 = 0.70) and EP from 1.47 ± 0.44kJ kg-1 in the first half to 1.32 ± 0.40kJ kg-1 the second half (P < 0.001, ε2 = 0.75). Where energy expenditure in the power categories LP and MP almost stayed stable during the match. Figure 3. Average distance covered entire match players in 15-minute periods. * (P < 0.01) a significant decline between the first half (15-45Min) and the second half (60-90Min). $ (P < 0.01) a significant decline between the 15-minute periods in the second half (60-90Min).
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