## 4 Discussion  
According to the results, there was no difference in the physical parameters of the players of different playing positions (vRER, VO\({}_{2}\)max, vVO\({}_{2}\)max). The VO\({}_{2}\)max was between 55.6 and 59.4 mL/kg/min, the vRER between 13.4 and 14.3 km/h, and the vVO\({}_{2}\)max between 17.4 and 18.6 km/h. In previous studies, it had been reported that in high level football the VO\({}_{2}\)max could be >60 mL/kg/min [63], but in recent studies the values were 58 \(\pm\) 5.2 mL/kg/min and 13.4 \(\pm\) 1.3 km/h for VO\({}_{2}\)max and vRER, respectively [27], and between 17.7 \(\pm\) 1 km/h and 18.0 \(\pm\) 0.9 km/h for vVO\({}_{2}\)max [64]. For playing position, the study by [PERSON] et al. [51] revealed VO\({}_{2}\)max values of 57.83 \(\pm\) 1.38 mL/kg/min, 57.71 \(\pm\) 4.96 mL/kg/min, 56.72 \(\pm\) 3.65 mL/kg/min, vRER values of 13.41 \(\pm\) 0.67 km/h, 13.41 \(\pm\) 0.67 km/h, 13.41 \(\pm\) 0.67 km/h, and vVO\({}_{2}\)max values of 18.67 \(\pm\) 0.70 km/h, 18.63 \(\pm\) 1.10 km/h, 17.45 \(\pm\) 0.93 km/h for defenders, midfielders and strikers, respectively. Similarly to our study results, there were no differences in the VO\({}_{2}\)max between the players of different playing positions [46; 47; 51; 64; 65]. For vRER, our study did not show any difference. The only relevant results are in the literature by [PERSON] et al. [51] (but they used AnT instead of vRER), which revealed that the midfielders, the wingers and the wide defenders had higher values than the central defenders and the strikers. However, in our study there was a tendency for lower vRER values for the central defenders and the strikers in comparison to the other positions, and similar results were also found in another study [47]. These differences can be explained because the players on the wide positions can benefit from a higher vRER, to perform more high intensity actions [66]. The same level of vVO\({}_{2}\)max between the players is in line with other authors [64; 67]; on the contrary, [PERSON] et al. [68] found higher values for the midfielders, but they separated the  
\begin{table} \begin{tabular}{l l l l l l l l l l l l l l} \hline  & & **ACC2** & **ACC3** & **DEC2** & **DEC3** & **DIST** & **DIS4** & **DIS5** & **DIS6** & **SPEF** & **MPW4** & **MPW5** & **MPW6** & **MPWEF** \\ \hline \multirow{2}{*}{vRER} & r & 0.735 & 0.789 & 0.660 & 0.751 & 0.331 & \(-\)0.403 & \(-\)0.649 & \(-\)0.505 & \(-\)0.081 & \(-\)0.051 & 0.597 & 0.262 & 0.866 \({}^{*}\) \\  & \(p\) & 0.096 & 0.062 & 0.154 & 0.085 & 0.521 & 0.429 & 0.163 & 0.307 & 0.879 & 0.924 & 0.211 & 0.616 & 0.026 \\ \hline \multirow{2}{*}{VO\({}_{2}\)max} & r & 0.214 & 0.395 & 0.307 & 0.229 & 0.068 & \(-\)0.204 & \(-\)0.452 & 0.059 & \(-\)0.038 & \(-\)0.115 & 0.130 & 0.200 & 0.317 \\  & \(p\) & 0.645 & 0.381 & 0.503 & 0.622 & 0.884 & 0.661 & 0.308 & 0.899 & 0.935 & 0.806 & 0.781 & 0.668 & 0.489 \\ \hline \multirow{2}{*}{vVO\({}_{2}\)max} & r & 0.674 & 0.801 \({}^{*}\) & 0.506 & 0.614 & \(-\)0.143 & \(-\)0.431 & \(-\)0.664 & \(-\)0.435 & \(-\)0.025 & \(-\)0.145 & 0.414 & 0.363 & 0.707 \\  & \(p\) & 0.097 & 0.030 & 0.247 & 0.143 & 0.759 & 0.335 & 0.104 & 0.330 & 0.958 & 0.757 & 0.356 & 0.423 & 0.076 \\ \hline \end{tabular}