Table 4.
Longitudinal development of cardiorespiratory fitness, linear, and change-of-direction speed, and lower limb power.
| T0 | T1 | T2 | p-Value | ES T0-T1 – T0-T2 – T1-T2 | Time × Position | |||
|---|---|---|---|---|---|---|---|---|
| Cardiorespiratory Fitness | ||||||||
| YYIRT (km/h) | Forwards | 14.50 ± 0.41 | 15.22 ± 0.43 | 15.70 ± 0.48 | 0.001 ‡£⸹ | 1.78 – 2.94 – 1.10 | 0.112 | |
| Backs | 15.43 ± 0.28 * | 15.86 ± 0.24 * | 16.46 ± 0.30 * | 0.001 ‡£⸹ | 1.54 – 3.72 – 2.49 | |||
| TG | 14.88 ± 0.59 | 15.48 ± 0.48 | 16.01 ± 0.56 | 0.001 ‡£⸹ | 1.03 – 1.93 – 1.10 | |||
| Linear Sprint Speed | ||||||||
| 10-m (s) | Forwards | 1.76 ± 0.55 | 1.73 ± 0.05 | 1.68 ± 0.05 | 0.001 £⸹ | 0.48 – 1.45 – 1.07 | 0.160 | |
| Backs | 1.69 ± 0.4 1* | 1.61 ± 0.06 * | 1.56 ± 0.07 * | 0.001 ‡£⸹ | 1.79 – 2.96 – 0.77 | |||
| TG | 1.73 ± 0.60 | 1.68 ± 0.08 | 1.63 ± 0.08 | 0.001 ‡£⸹ | 0.76 – 1.61 – 0.63 | |||
| 20-m (s) | Forwards | 3.15 ± 0.12 | 3.15 ± 0.14 | 3.07 ± 0.12 | 0.021 £⸹ | 0.07 – 0.64 – 0.61 | 0.622 | |
| Backs | 2.97 ± 0.20 * | 2.95 ± 0.11 * | 2.84 ± 0.10 * | 0.067 | 0.09 – 0.64 – 1.01 | |||
| TG | 3.07 ± 0.18 | 3.07 ± 0.16 | 2.97 ± 0.16 | 0.001 £⸹ | 0.01 – 0.56 – 0.60 | |||
| 30-m (s) | Forwards | 4.47 ± 0.21 | 4.50 ± 0.23 | 4.34 ± 0.14 | 0.015 £⸹ | 0.15 – 0.62 – 0.70 | 0.654 | |
| Backs | 4.28 ± 0.23 | 4.24 ± 0.13 * | 4.10 ± 0.13 * | 0.002 £⸹ | 0.14 – 0.77 – 1.08 | |||
| TG | 4.39 ± 0.23 | 4.40 ± 0.23 | 4.24 ± 0.18 | 0.001 £⸹ | 0.02 – 0.64 – 0.67 | |||
| Change-of-Direction Speed | ||||||||
| t-test (s) | Forwards | 11.02 ± 0.47 | 10.66 ± 0.39 | 10.25 ± 0.64 | 0.001 ‡£⸹ | 0.76 – 1.65 – 1.05 | 0.851 | |
| Backs | 9.90 ± 0.50 * | 9.52 ± 0.52 * | 9.21 ± 0.56 * | 0.003 ‡£⸹ | 0.74 – 1.36 – 0.60 | |||
| TG | 10.55 ± 0.73 | 10.19 ± 0.72 | 9.82 ± 0.79 | 0.001 ‡£⸹ | 0.49 – 1.00 – 0.51 | |||
| Lower Limb Muscle Power | ||||||||
| SLJ (m) | Forwards | 2.07 ± 0.18 | 2.16 ± 0.21 | 2.28 ± 0.21 | 0.001 ‡£⸹ | 0.49 – 1.18 – 0.59 | 0.602 | |
| Backs | 2.33 ± 0.16 * | 2.42 ± 0.17 * | 2.51 ± 0.12 * | 0.001 ‡£⸹ | 0.56 – 1.16 – 0.54 | |||
| TG | 2.18 ± 0.21 | 2.27 ± 0.23 | 2.38 ± 0.21 | 0.001 ‡£⸹ | 0.42 – 0.94 – 0.48 | |||
| CMJ (cm) | Forwards | 29.58 ± 3.38 | 30.71 ± 3.54 | 32.10 ± 4.02 | 0.001 ‡£⸹ | 0.33 – 0.74 – 0.39 | 0.055 | |
| Backs | 32.79 ± 3.52 | 35.11 ± 3.87 * | 36.71 ± 4.48 * | 0.001 ‡£⸹ | 0.66 – 1.11 – 0.41 | |||
| TG | 30.90 ± 3.71 | 32.52 ± 4.20 | 34.00 ± 4.70 | 0.001 ‡£⸹ | 0.44 – 0.84 – 0.35 | |||
Mean ± SD reported for forwards, backs and total group, YYIRT: Yo-Yo Intermittent Recovery Test level 1, CMJ: Countermovement jump, SLJ: Standing long jump, TG: Total group, ES: Effect size, ‡: Significant differences between T0-T1 (p < 0.05), £: Significant differences between T0-T2 (p < 0.05), ⸹: Significant differences between T1-T2 (p < 0.05), *: Significant differences between forwards and backs (p < 0.05).