Table 4. Athletic Performance Before and After the Intervention   Group Pre-test Post-test Mean Change (95% CI) P (within) Between-group differences at Post-test P (between) Cohen's d Back squat 1RM (kg) Control 128.38 ± 6.87 130.50 ± 6.82 2.12 (-0.17, 4.41) 0.069 Control vs 40% AOP: 3.92 (0.18, 7.66)† 0.012 0.59 40% AOP 128.00 ± 7.07 134.50 ± 6.81 6.50 (3.90, 9.10)* < 0.001 Control vs 60% AOP: 6.86 (3.12, 10.60)† < 0.001 1.07 60% AOP 128.25 ± 5.87 137.50 ± 6.21 9.25 (6.75, 11.75)* < 0.001 40% AOP vs 60% AOP: 2.94 (0.20, 5.68)‡ 0.048 0.46 CMJ height (cm) Control 37.36 ± 4.92 37.91 ± 4.81 0.55 (-0.23, 1.33) 0.158 Control vs 40% AOP: 2.15 (0.08, 4.22)† 0.047 0.55 40% AOP 37.99 ± 2.75 40.06 ± 2.67 2.07 (0.80, 3.34)* 0.002 Control vs 60% AOP: 3.84 (0.77, 6.91)† 0.015 0.79 60% AOP 39.16 ± 5.38 41.81 ± 5.12 2.65 (1.00, 4.30)* 0.003 40% AOP vs 60% AOP: 1.66 (-0.42, 3.74) 0.210 0.43 T-test time (s) Control 10.30 ± 0.42 10.22 ± 0.38 -0.08 (-0.18, 0.02) 0.124 Control vs 40% AOP: -0.21 (-0.39, -0.03)† 0.018 0.74 40% AOP 10.23 ± 0.25 10.00 ± 0.18 -0.23 (-0.35, -0.11)* 0.001 Control vs 60% AOP: -0.19 (-0.37, -0.01)† 0.028 0.62 60% AOP 10.28 ± 0.28 10.02 ± 0.25 -0.26 (-0.38, -0.14)* < 0.001 40% AOP vs 60% AOP: 0.03 (-0.15, 0.21) 0.851 0.09 30-m sprint time (s) Control 4.07 ± 0.14 4.05 ± 0.13 -0.02 (-0.06, 0.02) 0.415 Control vs 40% AOP: -0.01 (-0.09, 0.07) 0.574 0.07 40% AOP 4.08 ± 0.16 4.06 ± 0.15 -0.02 (-0.08, 0.04) 0.185 Control vs 60% AOP: -0.06 (-0.14, 0.02) 0.087 0.00 60% AOP 4.06 ± 0.18 4.05 ± 0.16 -0.01 (-0.07, 0.05) 0.248 40% AOP vs 60% AOP: -0.04 (-0.12, 0.04) 0.221 0.06 Data are presented as mean ± SD. *Significant difference compared with pre-test (P < 0.05). †Significantly greater than the control group at post-test (P < 0.05). ‡Significantly greater than the 40% AOP group at post-test (P < 0.05). Mean change = post-test value minus pre-test value. Cohen’s d values are for between-group pairwise comparisons.