Table 4.
Inter-group comparison of sprint running, change of direction and jump performances before (pre) and after (post) the 10-week trial.
| Variables | Group | Pre-Trial | Post-Trial | p Value | d (Cohen) | |
|---|---|---|---|---|---|---|
| Sprint | 5 m (s) | Loaded plyometric group | 1.17 ± 0.02 | 1.05 ± 0.06 ***,+ | <0.001 a | 1.36 (large) |
| Unloaded plyometric group | 1.16 ± 0.02 | 1.12 ± 0.05 o | <0.001 b | 1.26 (large) | ||
| Control | 1.17 ± 0.02 | 1.18 ± 0.05 | <0.001 c | 1.42 (large) | ||
| 10 m (s) | Loaded plyometric group | 2.12 ± 0.02 | 1.94 ± 0.08 ***,+++ | <0.001 a | 1.51 (large) | |
| Unloaded plyometric group | 2.12 ± 0.02 | 2.10 ± 0.08 | <0.001 b | 1.34 (large) | ||
| Control | 2.12 ± 0.02 | 2.12 ± 0.06 | <0.001 c | 1.58 (large) | ||
| 20 m (s) | Loaded plyometric group | 3.26 ± 0.05 | 3.07 ± 0.09 **,+ | 0.003 a | 0.85 (large) | |
| Unloaded plyometric group | 3.27 ± 0.06 | 3.08 ± 0.1 | <0.001 b | 1.04 (large) | ||
| Control | 3.24 ± 0.07 | 3.25 ± 0.08 | <0.001 c | 1.17 (large) | ||
| 30 m (s) | Loaded plyometric group | 4.55 ± 0.06 | 4.27 ± 0.08 ***,++ | <0.001 a | 1.74 (large) | |
| Unloaded plyometric group | 4.56 ± 0.05 | 4.42 ± 0.15 ooo | <0.001 b | 1.29 (large) | ||
| Control | 4.53 ± 0.07 | 4.62 ± 0.12 | <0.001 c | 1.5 (large) | ||
| 40 m (s) | Loaded plyometric group | 5.85 ± 0.10 | 5.55 ± 0.13 * | 0.021 a | 0.68 (medium) | |
| Unloaded plyometric group | 5.87 ± 0.09 | 5.68 ± 0.15 | <0.001 b | 1.42 (large) | ||
| Control | 5.85 ± 0.08 | 5.79 ± 0.24 | 0.027 c | 0.65 (medium) | ||
| Change of direction | Sprint time over 9–3–6–3–9 m with 180° turns (s) | Loaded plyometric group | 8.73 ± 0.14 | 8.30 ± 0.14 ***,++ | <0.001 a | 1.19 (large) |
| Unloaded plyometric group | 8.78 ± 0.14 | 8.54 ± 0.14 | <0.001 b | 1.62 (large) | ||
| Control | 8.71 ± 0.19 | 8.70 ± 0.13 | <0.001 c | 1.22 (large) | ||
| Sprint time over 9–3–6–3–9 m with backward and forward running (s) | Loaded plyometric group | 8.62 ± 0.14 | 8.26 ± 0.17 ***,++ | <0.001 a | 1.06 (large) | |
| Unloaded plyometric group | 8.67 ± 0.14 | 8.47 ± 0.14 | <0.001 b | 1.44 (large) | ||
| Control | 8.65 ± 0.13 | 8.57 ± 0.13 | 0.004 c | 0.82 (large) | ||
| Sprint time over 4 × 5 m (s) | Loaded plyometric group | 6.33 ± 0.16 | 6.08 ± 0.18 **,+ | 0.003 a | 0.85 (large) | |
| Unloaded plyometric group | 6.38 ± 0.14 | 6.26 ± 0.23 | 0.004 b | 0.71 (medium) | ||
| Control | 6.36 ± 0.13 | 6.37 ± 0.20 | 0.026 c | 0.66 (medium) | ||
| Jump tests | Squat jump (cm) | Loaded plyometric group | 33.7 ± 1.7 | 39.6 ± 2.8 *** | <0.001 a | 1.03 (large) |
| Unloaded plyometric group | 33.4 ± 1.9 | 40.0 ± 2.8 ooo | <0.001 b | 2.18 (large) | ||
| Control | 33.6 ± 1.7 | 35.0 ± 2.0 | <0.001 c | 1.06 (large) | ||
| Contermovement jump (cm) | Loaded plyometric group | 35.5 ± 1.7 | 40.2 ± 4.4 * | 0.010 a | 0.75 (medium) | |
| Unloaded plyometric group | 35.2 ± 1.9 | 41.7 ± 3.4 o | <0.001 b | 1.37 (large) | ||
| Control | 35.7 ± 1.8 | 36.1 ± 3.2 | 0.002 c | 0.88 (large) | ||
| Contermovement jump aimed arms (cm) | Loaded plyometric group | 37.3 ± 1.7 | 44.3 ± 2.9 ** | 0.005 a | 0.80 (large) | |
| Unloaded plyometric group | 36.7 ± 1.6 | 43.9 ± 3.7 o | <0.001 b | 1.87 (large) | ||
| Control | 37.5 ± 1.8 | 38.9 ± 4.5 | 0.001 c | 0.94 (large) | ||
| Five jump test (m) | Loaded plyometric group | 11.5 ± 0.8 | 13.2 ± 0.7 ** | 0.005 a | 0.81 (large) | |
| Unloaded plyometric group | 11.4 ± 0.5 | 13.0 ± 0.8 o | <0.001 b | 1.82 (large) | ||
| Control | 11.4 ± 0.6 | 12.0 ± 0.9 | 0.016 c | 0.71 (large) | ||
s = seconds; * = denotes a significant difference between loaded and control groups; + = denotes a significant difference between loaded and unloaded groups; o = denotes a significant difference between unloaded and control groups; a = denotes a main effect of group, b = denotes a main effect of time; c = denote a group × time interaction. *: p < 0.05; **: p < 0.01; ***: p < 0.001; +: p < 0.05; ++: p < 0.01; +++: p < 0.001; o: p < 0.05; ooo: p < 0.001.