Table 5. Descriptive statistics and ANCOVA for the performance variables, considering intervention subgroups. All variables Strength group ± SD Hedges g Ballistic group ± SD Hedges g ANCOVA Pre-intervention Post-intervention Pre-intervention Post-intervention p-value η2 CMJ height (m) 0.38 ± 0.05 0.39 ± 0.06† 0.18 (-0.87-0.52) 0.40 ± 0.06 0.41 ± 0.06 0.16 (-1.00-0.68) 0.888 0.006 CMJ jump time (s) 0.69 ± 0.08 0.67 ± 0.08 -0.24 (-0.45-0.94) 0.71 ± 0.07 0.72 ± 0.11 0.10 (-0.94-0.73) 0.348 0.055 RSI 0.55 ± 0.09 0.58 ± 0.11 0.29 (-0.99-0.41) 0.55 ± 0.11 0.56 ± 0.10 0.09 (-0.93-0.74) 0.598 0.027 5m (s) 1.08 ± 0.08 1.02 ± 0.06† -0.83 (0.11-1.55) 1.05 ± 0.07 1.05 ± 0.12§ 0.00 (-0.84-0.84) 0.006 0.233 10m (s) 1.82 ± 0.12 1.77 ± 0.07† -0.50 (-0.21-1.20) 1.79 ± 0.13 1.80 ± 0.13§ -0.07 (-0.91-0.76) 0.004 0.248 15m (s) 2.48 ± 0.14 2.44 ± 0.09 -0.33 (-0.37-1.10) 2.48 ± 0.12 2.47 ± 0.12§ -0.08 (-0.76-0.92) 0.005 0.236 20m (s) 3.12 ± 0.18 3.06 ± 0.08 -0.49 (-0.21-1.19) 3.12 ± 0.12 3.10 ± 0.16§ -0.14 (0-70-0.97) 0.018 0.187 505 left (s) 2.27 ± 0.12 2.18 ± 0.13† -0.70 (-0.01-1.42) 2.19 ± 0.16 2.12 ± 0.14§ -0.45 (-0.40-1.29) 0.029 0.167 505 right (s) 2.23 ± 0.09 2.19 ± 0.13 -0.35 (-0.35-1.05) 2.20 ± 0.13 2.12 ± 0.16§ -0.53 (-0.32-1.38) 0.028 0.167 CoDD left 0.45 ± 0.14 0.44 ± 0.15 -0.07 (-0.63-0.76) 0.41 ± 0.22 0.32 ± 0.13 -0.48 (-0.37-1.33) 0.093 0.115 CoDD right 0.41 ± 0.15 0.41 ± 0.15 -0.00 (-0.69-0.69) 0.41 ± 0.19 0.33 ± 0.14 -0.46 (-0.39-1.31) 0.198 0.080 DSI 0.98 ± 0.07 0.96 ± 0.10 -0.23 (-0.47-0.92) 0.82 ± 0.06 0.82 ± 0.11 0.00 (-0.84-0.84) 0.106 0.96 CMJ max F (N) 2398 ± 334 2381 ± 269 -0.05 (-0.64-0.75) 2179 ± 398 2206 ± 417 0.06 (-0.90-0.77) 0.611 0.026 CMJ avg F (N) 1874 ± 228 1903 ± 187 0.14 (-0.83-0.56) 1759 ± 328 1749 ± 301 -0.03 (-0.81-0.87) 0.134 0.103 IMTP rel F (N/kg) 27.33 ± 3.11 28.14 ± 3.14 0.25 (-0.95-0.44) 31.35 ± 3.35 33.04 ± 4.44§ 0.41 (-1.26-0.43) 0.032 0.169 IMTP max F (N) 2436 ± 394 2517 ± 449 0.19 (-0.88-0.51) 2664 ± 533 2809 ± 602 0.25 (-1.08-0.59) 0.128 0.105 † = indicates significant difference (p < 0.05) in paired t-test within group § = Indicates significant difference (p < 0.05) in post-intervention groups when using pretest score as a covariate η2 = partial eta squared (analysis of covariance); CMJ = countermovement jump; F = force; max = maximal; avg = average; DSI = dynamic strength index; RSI = reactive strength index; 505 = change of direction test; CoDD = change of direction deficit; N = newtons; s = seconds; m = meters; N/kg = newtons per kilogram; IMTP = isometric mid-thigh pull; rel = relative; SD = standard deviation.