## 3 Results  
The players of different playing positions did not have any differences in the physical parameters that were assessed during the lab testing process: vRER (\(p\) = 0.528, \(\eta^{2}\) = 0.053), VO\({}_{2}\)max (\(p\) = 0.919, \(\eta^{2}\) = 0.024) and vVO\({}_{2}\)max (\(p\) = 0.734, \(\eta^{2}\) = 0.049). The results are presented in Table 1. There was no correlation between vRER, VO\({}_{2}\)max and vVO\({}_{2}\)max and the external load for the central defenders (Table 2). For the wide defenders there was a high correlation between vRER and MPWEF (\(p\) = 0.028, r = 0.721), but no correlation between VO\({}_{2}\)max, vVO\({}_{2}\)max and the external load parameters (Table 3). For the midfielders there was a very high correlation between vRER and ACC2 (\(p\) = 0.004, r = 0.741) and MPWEF (\(p\) = 0.005, r = 0.725), and a high correlation between DEC2 (\(p\) = 0.01, r = 0.685) and MPW5 (\(p\) = 0.016, r = 0.652). For VO\({}_{2}\)max a high correlation was observed with DEC3 (\(p\) = 0.045, r = 0.564), MPW4 (\(p\) = 0.026, r = 0.614), MPW5 (\(p\) = 0.017, r = 0.646), MPWEF (\(p\) = 0.01, r = 0.685), but no correlation was observed between vVO\({}_{2}\)max and the external load parameters (Table 4). For the wingers there was a high correlation between vVO\({}_{2}\)max and ACC2 (\(p\) = 0.038, r = 0.733), MPW5 (\(p\) = 0.005, r = 0.873) and MPWEF (\(p\) = 0.009, r = 0.84), but no correlation between vRER, VO\({}_{2}\)max and the external load parameters (Table 5). For the strikers there was a very high correlation between vRER and MPWEF (\(p\) = 0.026, r = 0.866), and also between vVO\({}_{2}\)max and ACC3 (\(p\) = 0.03, r = 0.801), but no correlation between VO\({}_{2}\)max and the external load parameters (Table 6). \begin{table}
\begin{tabular}{c c c c} \hline
**Playing Position** & **vRER (km/h)** & **VO\({}_{2}\)max (mL/kg/min)** & **vVO\({}_{2}\)max (km/h)** \\ \hline Central defenders (\(n\) = 7) & 13.58 \(\pm\) 1.11 & 55.50 \(\pm\) 5.71 & 17.66 \(\pm\) 1.03 \\ Wide defenders (\(n\) = 9) & 14.15 \(\pm\) 1.06 & 58.40 \(\pm\) 4.39 & 18.35 \(\pm\) 1.59 \\ Midfielders (\(n\) = 13) & 13.65 \(\pm\) 1.07 & 56.94 \(\pm\) 5.02 & 17.75 \(\pm\) 1.49 \\ Wide attackers (\(n\) = 8) & 13.64 \(\pm\) 0.75 & 57.68 \(\pm\) 2.69 & 17.55 \(\pm\) 1.21 \\ Strikers (\(n\) = 7) & 13.83 \(\pm\) 0.76 & 57.58 \(\pm\) 2.19 & 17.75 \(\pm\) 1.26 \\  & \(p\) = 0.528 & \(p\) = 0.919 & \(p\) = 0.734 \\  & \(\mathrm{F}\) = 0.528 & \(\mathrm{F}\) = 0.232 & \(\mathrm{F}\) = 0.503 \\  & \(\mathrm{n}^{2}\) = 0.053 & \(\mathrm{n}^{2}\) = 0.024 & \(\mathrm{n}^{2}\) = 0.049 \\ \hline \end{tabular} Legend: vRER—speed on respiratory gas exchange ratio: 1.0; VO\({}_{2}\)max—maximal oxygen intake; vVO\({}_{2}\)max—minimum speed on maximal oxygen intake intake.  
\end{table} 
Table 1: The mean \(\pm\) SD values of physical parameters for the players of different positions. \begin{table} \begin{tabular}{l l c c c c c c c c c c c c c} \hline \hline  & & **ACC2** & **ACC3** & **DEC2** & **DEC3** & **DIST** & **DIS4** & **DIS5** & **DIS6** & **SPEF** & **MPW4** & **MPW5** & **MPW6** & **MPWEF** \\ \hline vRER & r & 0.741 **+** & 0.212 & 0.685 **+** & 0.632 **+** & 0.433 & \(-\)0.100 & 0.290 & \(-\)0.133 & 0.412 & 0.509 & 0.652 **+** & 0.235 & 0.725 **+** \\  & \(p\) & 0.004 & 0.486 & 0.010 & 0.020 & 0.139 & 0.746 & 0.337 & 0.666 & 0.162 & 0.076 & 0.016 & 0.439 & 0.005 \\ \hline VO\({}_{2}\)max & r & 0.542 & 0.076 & 0.356 & 0.564 **+** & 0.539 & \(-\)0.039 & 0.164 & \(-\)0.428 & 0.186 & 0.614 **+** & 0.646 **+** & \(-\)0.105 & 0.685 **+** \\  & \(p\) & 0.056 & 0.804 & 0.232 & 0.045 & 0.057 & 0.900 & 0.593 & 0.144 & 0.543 & 0.026 & 0.017 & 0.733 & 0.010 \\ \hline vVO\({}_{2}\)max & r & 0.302 & 0.404 & 0.312 & 0.388 & 0.204 & \(-\)0.440 & \(-\)0.163 & \(-\)0.132 & 0.216 & 0.095 & 0.214 & 0.292 & 0.520 \\  & \(p\) & 0.315 & 0.171 & 0.300 & 0.191 & 0.504 & 0.132 & 0.594 & 0.667 & 0.479 & 0.758 & 0.483 & 0.333 & 0.069 \\ \hline \hline \end{tabular}