Table 3. Estimated means and SE at baseline (pre-) and posttest and % change (±SD) for leg-extensor force-velocity profile in the football training (FOOT) and the control (CON) group. FOOT CON Mean SE % Mean SE % Time Time x group F0 (N) Pre 876 42 827 42 Post 904 43 3.4 ± 9.2 858 42 4.3 ± 9.3 0.558 0.922 V0 (m s-1) Pre 1.12 0.03 1.13 0.03 Post 1.22 0.03 7.6 ± 8.7* 1.17 0.03 2.8 ± 6.7 0.003 0.043 SFV/F0 (%F0 m s-1) Pre -0.903 0.025 -0.892 0.025 Post -0.845 0.027 -6.5 ± 7.4 -0.872 0.026 -2.3 ± 6.4 0.006 0.065 Pmax (W) Pre 249 17 236 17 Post 284 18 11.0 ± 10.5 251 17 7.0 ± 9.1 0.009b 0.221a p-values of Linear Mixed-Effects Models analyses (significant values in bold) * significant within-group change from Pre to Post anot normally distributed and log transformed for the analyses. For easier interpretation, non-transformed data means were reported for all variables. F0 = theoretical maximal isometric force; V0 = maximal velocity; SFV/F0 = the slope of the force-velocity relationship relative to F0; Pmax = maximal muscle power