Table 3.
Changes in performance variables following the 8 weeks of intervention for the plyometric training group (PG, n = 33) and the control group (CG, n = 17).
| Variables | Pre-Training | Post- Training |
Cohen’s d (Pre vs. Post-Training) |
Change from Pre- to Post-Training (90% CI) |
Cohen’s d and Quantitative Inference PG vs. CG (PG, Trivial, CG) |
p Value Group × Time Interaction | |
|---|---|---|---|---|---|---|---|
| CMJ (cm) | PG | 18.1 ± 3.2 | 20.1 ± 2.9 | 0.67 | 2.0 (1.2 to 2.8) | 0.48 | 0.166 |
| CG | 17.0 ± 4.5 | 17.8 ± 4.6 | 0.18 | 0.8 (−0.4 to 2.0) | (69%, 30%, 1%) | ||
| R + L CMJ (cm) | PG | 15.2 ± 4.2 | 18.1 ± 4.0 | 0.72 | 3.0 (1.7 to 4.3) | 0.34 | 0.277 |
| CG | 14.3 ± 5.1 | 15.9 ± 4.7 | 0.34 | 1.6 (0.3 to 2.9) | (96%, 4%, 0%) | ||
| DJ (20 cm) (cm) | PG | 15.3 ± 3.9 | 17.3 ± 3.3 | 0.56 | 2.0 (1.0 to 3.0) | 0.15 | 0.634 |
| CG | 13.9 ± 4.3 | 16.4 ± 4.1 | 0.61 | 2.5 (1.1 to 3.9) | (44%, 45%, 11%) | ||
| SJ (cm) | PG | 17.3 ± 3.4 | 19.0 ± 3.2 | 0.52 | 1.7 (1.0 to 2.4) | 0.18 | 0.547 |
| CG | 16.3 ± 4.0 | 17.5 ± 3.5 | 0.33 | 1.2 (−0.2 to 2.6) | (76%, 22%, 2%) | ||
| SLJ (cm) | PG | 112.5 ± 14.3 | 134.7 ± 14.5 | 1.57 | 22.2 (17.5 to 26.9) | 0.20 | 0.507 |
| CG | 107.4 ± 17.9 | 126.6 ± 17.7 | 1.11 | 19.3 (14.9 to 23.7) | (25%, 52%, 23%) | ||
| COD 5 + 5 m (s) |
PG | 3.77 ± 0.36 | 3.54 ± 0.28 | 0.72 | −0.24 (‒0.33 to −0.15) | 0.39 | 0.203 |
| CG | 3.81 ± 0.37 | 3.71 ± 0.28 | 0.31 | −0.11 (−0.27 to 0.05) | (59%, 32%, 9%) | ||
| COD 10 + 10 m (s) |
PG | 5.94 ± 0.42 | 5.71 ± 0.36 * | 0.60 | −0.22 (−0.32 to −0.12) | 1.00 | 0.008 |
| CG | 6.02 ± 0.47 | 6.14 ± 0.48 | 0.26 | 0.11 (−0.01 to 0.23) | (98%, 2%, 0%) | ||
| 10 m sprint (s) | PG | 2.77 ± 0.26 | 2.51 ± 0.22 * | 1.10 | −0.26 (−0.33 to −0.19) | 0.40 | 0.018 |
| CG | 2.74 ± 0.24 | 2.65 ± 0.25 | 0.38 | −0.10 (−0.04 to −0.16) | (86%, 13%, 1%) | ||
| 20 m sprint (s) | PG | 4.85 ± 0.54 | 4.36 ± 0.30 * | 1.14 | −0.50 (−0.64 to −0.36) | 0.81 | 0.011 |
| CG | 4.78 ± 0.45 | 4.62 ± 0.37 | 0.40 | −0.16 (−0.27 to −0.05) | (97%, 3%, 0%) | ||
| CT (ms) | PG | 306 ± 77 | 301 ± 84 | 0.05 | −4 (−38 to 29) | 0.14 | 0.642 |
| CG | 282 ± 60 | 290 ± 73 | 0.12 | 8 (−22 to 38) | (90%, 9%, 1%) | ||
| RSI (mm/ms) | PG | 0.57 ± 0.22 | 0.65 ± 0.22 | 0.37 | 0.08 (0.02 to 0.14) | 0.00 | 0.998 |
| CG | 0.55 ± 0.21 | 0.63 ± 0.24 | 0.37 | 0.08 (−0.04 to 0.20) | (85%, 14%, 1%) | ||
* p < 0.01 from the corresponding pre-training value; CMJ: counter movement jump; R + L CMJ: sum of right and the left leg counter movement jumps; DJ: drop jump; SJ: squat jump; SLJ: standing long jump; COD 5 + 5 m: 5 + 5 m change of direction test with a 180° turn; COD 10 + 10 m: 10 + 10 m change of direction test with a 180° turn.