## 2 Materials and Methods
### Participants
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & \multicolumn{5}{c}{2016/2017} \\ \hline  & U14 & U15 & U16 & U17 & U18 \\ \hline N & 33 & 25 & 22 & 23 & 10 \\ Age & 13.84 \(\pm\) 0.61 & 15 \(\pm\) 0.08 & 15.89 \(\pm\) 0.18 & 17 \(\pm\) 0.80 & 18.21 \(\pm\) 0.75 \\ Height (cm) & 162 \(\pm\) 15.23 & 165 \(\pm\) 8.85 & 171.83 \(\pm\) 4.08 & 174.86 \(\pm\) 11.12 & 176.90 \(\pm\) 10.12 \\ Weight (Kg) & 50.19 \(\pm\) 4.72 & 61.86 \(\pm\) 2.55 & 64.48 \(\pm\) 3.25 & 67.83 \(\pm\) 2.25 & 70.18 \(\pm\) 2.55 \\ BF (\%) & 10.79 \(\pm\) 3.21 & 13.73 \(\pm\) 4.12 & 12.21 \(\pm\) 1.58 & 13.33 \(\pm\) 0.87 & 13.07 \(\pm\) 1.28 \\ Muscle Mass (\%) & 41.77 \(\pm\) 5.61 & 52.59 \(\pm\) 1.83 & 56.47 \(\pm\) 2.02 & 58.67 \(\pm\) 3.15 & 60.92 \(\pm\) 2.05 \\ \hline  & \multicolumn{5}{c}{2017/2018} \\ \hline  & U14 & U15 & U16 & U17 & U18 \\ \hline N & 47 & 21 & 32 & 23 & 24 \\ Age & 13.59 \(\pm\) 0.69 & 14.84 \(\pm\) 0.7 & 15.81 \(\pm\) 0.64 & 16.84 \(\pm\) 1.32 & 18 \(\pm\) 0.2 \\ Height (cm) & 156 \(\pm\) 50.07 & 157 \(\pm\) 49.53 & 157.18 \(\pm\) 54.72 & 176.05 \(\pm\) 18.50 & 177.15 \(\pm\) 7.62 \\ Weight (Kg) & 60.21 \(\pm\) 8.01 & 60.27 \(\pm\) 7.9 & 67.32 \(\pm\) 11.19 & 68 \(\pm\) 9.33 & 70.66 \(\pm\) 8.01 \\ BF (\%) & 13.94 \(\pm\) 4.63 & 13.92 \(\pm\) 4.57 & 13.49 \(\pm\) 2.84 & 13.52 \(\pm\) 3.23 & 12.43 \(\pm\) 4.21 \\ Muscle Mass (\%) & 37.78 \(\pm\) 23.55 & 42.32 \(\pm\) 17.56 & 44.95 \(\pm\) 25.96 & 45.35 \(\pm\) 26.14 & 52.29 \(\pm\) 22.04 \\ \hline  & \multicolumn{5}{c}{2018/2019} \\ \hline  & U14 & U15 & U16 & U17 & U18 \\ \hline N & 22 & 49 & 38 & 42 & 18 \\ Age & 13.86 \(\pm\) 0.35 & 15 \(\pm\) 0.8 & 16 \(\pm\) 0.12 & 17.21 \(\pm\) 0.25 & 18 \(\pm\) 0.1 \\ Height (cm) & 162.60 \(\pm\) 48.20 & 163.18 \(\pm\) 40.70 & 166 \(\pm\) 32.04 & 174.34 \(\pm\) 6.33 & 174.33 \(\pm\) 8.66 \\ Weight (Kg) & 60.39 \(\pm\) 20.46 & 61.71 \(\pm\) 13.90 & 66.53 \(\pm\) 6.01 & 68.15 \(\pm\) 6.52 & 69.64 \(\pm\) 10.16 \\ BF (\%) & 13.43 \(\pm\) 4.35 & 14.20 \(\pm\) 4.55 & 14.56 \(\pm\) 3.62 & 12.91 \(\pm\) 3.74 & 14.95 \(\pm\) 3.74 \\ Muscle Mass (\%) & 36.34 \(\pm\) 26.1 & 35.51 \(\pm\) 26.68 & 36.92 \(\pm\) 27.72 & 42.59 \(\pm\) 27.07 & 57.40 \(\pm\) 6.15 \\ \hline  & \multicolumn{5}{c}{2019/2020} \\ \hline  & U14 & U15 & U16 & U17 & U18 \\ \hline N & 49 & 22 & 30 & 51 & 29 \\ Age & 13.81 \(\pm\) 0.39 & 14.90 \(\pm\) 0.29 & 14.90 \(\pm\) 0.29 & 16.96 \(\pm\) 0.19 & 17.96 \(\pm\) 0.42 \\ Height (cm) & 167.45 \(\pm\) 12.04 & 170.06 \(\pm\) 5.77 & 174.54 \(\pm\) 4.59 & 175.36 \(\pm\) 6.43 & 176.22 \(\pm\) 8.29 \\ Weight (Kg) & 60.11 \(\pm\) 11.11 & 62.14 \(\pm\) 8.79 & 66.77 \(\pm\) 5.60 & 66.66 \(\pm\) 8.07 & 67.26 \(\pm\) 10.18 \\ BF (\%) & 14.58 \(\pm\) 2.69 & 15.35 \(\pm\) 4.05 & 12.77 \(\pm\) 2.50 & 13.17 \(\pm\) 3.03 & 12.48 \(\pm\) 2.79 \\ Muscle Mass (\%) & 34.34 \(\pm\) 22.3 & 38.24 \(\pm\) 25.1 & 40.69 \(\pm\) 27.26 & 43.23 \(\pm\) 26.14 & 42.51 \(\pm\) 27.53 \\ \hline  & \multicolumn{5}{c}{2020/2021} \\ \hline  & U14 & U15 & U16 & U17 & U18 \\ \hline N & 21 & 22 & 27 & 43 & 18 \\ Age & 13.62 \(\pm\) 0.5 & 14.94 \(\pm\) 0.22 & 15.96 \(\pm\) 0.33 & 16.96 \(\pm\) 0.28 & 18 \(\pm\) 0.48 \\ Height (cm) & 167.54 \(\pm\) 5.28 & 168.29 \(\pm\) 7.65 & 173.19 \(\pm\) 7.40 & 173.07 \(\pm\) 6.52 & 178.18 \(\pm\) 4.16 \\ Weight (Kg) & 60.99 \(\pm\) 6.08 & 59.85 \(\pm\) 8