Table 2. Changes in physical fitness parameters of soccer players and control subjects determined during two-soccer seasons (mean ± SD). Variables CMJ (cm) SqJ (cm) 5J (cm) 30m (s) YYIRT (m) VO2max (ml/kg/min) Groups SP C SP C SP C SP C SP C SP C T0-T1 3.18 ** 0.89£ 1.89 ** 0.31£ 1.35 ** 0.43*£ -0.03 -0.03 769 ** 21£ 5.37 ** 0.11£ T1-T2 2.27** 1.51*£ 1.38* 0.93£ 0.38 0.40 -0.04 -0.01 355* 89£ 2.38* 0.04£ T2-T3 5.35 ** 0.91£ 3.40 ** 0.69£ 0.59* 0.65* -0.16* -0.05£ 235** 79£ 1.17* 0.59£ T3-T4 2.17 ** 1.15£ 0.37* 0.49*£ 1.28** 0.57£ -0.05 -0.06 271 ** 11£ 1.86 ** 0.63£ T0-T4 12.66** 3.78**£ 6.98 ** 1.43 **£ 2.77 ** 1.17**£ -0.29** -0.17**£ 1119 ** 179**£ 8.47 ** 1.41 **£ CMJ, countermovement jump; SqJ, squat jump; 5J, highest of five consecutive jumps; 30m, 30-m sprint; YYIRT, distance covered in the Yo-Yo Intermittent Recovery Test - Level 1; VO2max, maximal oxygen consumption; SP, Soccer player; C, Controls; Significant differences in change between time points ** p < 0.001. Significant differences in change between soccer players and control subjects £: p < 0.01 * p < 0.01