Table 3. Descriptive statistics and ANCOVA for the independent measures of athletic performance. Performance metrics Control group mean ± SD Hedges g Intervention group mean ± SD Hedges g ANCOVA Pre-intervention Post-intervention Pre-intervention Post-intervention p-value η2 CMJ height (m) 0.38 ± 0.03 0.39 ± 0.03 0.39 (-1.12-0.33) 0.38 ± 0.05 0.40 ± 0.06 † 0.43 (-0.97-0.11) 0.778 0.002 CMJ jump time (s) 0.76 ± 0.09 0.73 ± 0.08 -0.36 (-0.36-1.09) 0.70 ± 0.07 0.69 ± 0.10 -0.11 (-0.42-0.65) 0.475 0.013 RSI 0.49 ± 0.07 0.53 ± 0.08 0.57 (-1.30-0.16) 0.55 ± 0.10 0.57 ± 0.11 0.19 (-0.72-0.35) 0.551 0.009 5m (s) 1.04 ± 0.06 1.08 ± 0.07 † 0.57 (-1.27-0.14) 1.07 ± 0.08 1.03 ± 0.09 § † -0.46 (-0.08-1.00) 0.007 0.116 10m (s) 1.79 ± 0.07 1.84 ± 0.08 † 0.63 (-1.34-0-08) 1.81 ± 0.13 1.78 ± 0.09 § -0.26 (-0.27-0.80) 0.005 0.183 15m (s) 2.46 ± 0.09 2.51 ± 0.10 0.55 (-1.26-0.16) 2.48 ± 0.13 2.45 ± 0.11 § -0.25 (-0.29-0.78) 0.002 0.209 20m (s) 3.09 ± 0.11 3.14 ± 0.12 † 0.46 (-1.16-0.25) 3.12 ± 0.15 3.08 ± 0.12 § -0.29 (-0.25-0.83) 0.010 0.153 505 left (s) 2.20 ± 0.15 2.23 ± 0.16 0.21 (-0.90-0.49) 2.24 ± 0.14 2.17 ± 0.15 § † -0.48 (-0.07-1.02) 0.008 0.161 505 right (s) 2.21 ± 0.13 2.25 ± 0.16 0.27 (-0.97-0.42) 2.21 ± 0.11 2.16 ± 0.14 § † -0.39 (-0.15-0.93) 0.009 0.159 CoDD left 0.45 ± 0.26 0.41 ± 0.13 -0.29 (-0.41-0.99) 0.43 ± 0.17 0.39 ± 0.15 -0.25 (-0.29-0.78) 0.837 0.001 CoDD right 0.46 ± 0.23 0.41 ± 0.13 -0.26 (-0.43-0.96) 0.41 ± 0.17 0.38 ± 0.15 -0.18 (-0.35-0.72) 0.757 0.002 * η2 = partial eta squared (analysis of covariance); SD = standard deviation; CMJ = countermovement jump; F = force; max = maximal; avg = average; RSI = reactive strength index; 505 = change of direction test; CoDD = change of direction deficit; N – newtons; m – meters; s – seconds; N/kg – newtons per kilogram † = 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.