Table 4.
Sum of skinfolds, linear speed, momentum, change of direction speed and aerobic capacity qualities of youth rugby union players categorised by age and playing position (data presented as mean and standard deviation)
| Age category | Level and position | Sample size (n) | Sum of 8 skinfolds (mm) | 5 m (s) | 10 m (s) | 20 m (s) | 40 m (s) | Initial sprint momentum (kg s−1) | 505 (s) | Yo-Yo IRTL1 (m) | 30:15 (km h−1) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Under 14 | Academy [64] | 5 | 446 ± 114 | ||||||||
| Under 15 | Academy [64] | 19 | 529 ± 60 | ||||||||
| Under 16 | Academy [62] | 29 | 88.8 ± 41.9 | 1.05 ± 0.09 | 1.82 ± 0.12 | 3.10 ± 0.19 | 5.66 ± 0.37 | 426 ± 67 |
L = 2.51 ± 0.17 R = 2.54 ± 0.14 |
1145 ± 337 | 18.4 ± 1.3 |
| Academy forwards [63] | 15 | 109.7 ± 44.6 | 1.09 ± 0.11 | 1.88 ± 0.12 | 3.21 ± 0.18 | 5.87 ± 0.30 | 971 ± 328 | 18.0 ± 1.4 | |||
| Academy backs [63] | 14 | 64.2 ± 20.2 | 1.01 ± 0.05 | 1.77 ± 0.08 | 2.99 ± 0.15 | 5.45 ± 0.31 | 1347 ± 221 | 18.8 ± 1.1 | |||
| Academy [64] | 23 | 563 ± 75 | |||||||||
| Academy [60] | 48 | 18.9 ± 1.1 | |||||||||
| Under 17 | Academy [64] | 4 | 609 ± 57 | ||||||||
| Under 18 | Academy [62] | 23 | 86.7 ± 21.3 | 1.06 ± 0.04 | 1.81 ± 0.06 | 3.09 ± 0.12 | 5.51 ± 0.24 | 482 ± 54 |
L = 2.57 ± 0.12 R = 2.52 ± 0.13 |
1225 ± 374 | 18.6 ± 1.1 |
| Academy Forwards [63] | 12 | 98.2 ± 20.1 | 1.07 ± 0.05 | 1.84 ± 0.06 | 3.14 ± 0.10 | 5.63 ± 0.21 | 1080 ± 240 | 18.2 ± 1.1 | |||
| Academy backs [63] | 12 | 72.7 ± 12.9 | 1.05 ± 0.04 | 1.79 ± 0.06 | 3.02 ± 0.10 | 5.34 ± 0.17 | 1467 ± 451 | 19.2 ± 1.0 | |||
| School [65] | 129 | 1.84 ± 0.11 | 3.15 ± 0.18 | 5.67 ± 0.31 | 1022 ± 515 | ||||||
| Academy [65] | 55 | 1.82 ± 0.08 | 3.10 ± 0.13 | 5.52 ± 0.27 | 1245 ± 451 | ||||||
| Academy [61] | 14 | 1.04 ± 0.04 | 1.80 ± 0.06 | 3.12 ± 0.10 | 5.57 ± 0.22 | ||||||
| School [46] | 35 | 1.90 ± 0.09 | 3.23 ± 0.13 | 5.80 ± 0.24 | 443 ± 58 | ||||||
| Academy [60] | 27 | 19.1 ± 1.1 | |||||||||
| Under 21 | Academy [62] | 15 | 105.3 ± 35.4 | 1.07 ± 0.07 | 1.79 ± 0.10 | 3.07 ± 0.13 | 5.43 ± 0.21 | 535 ± 70 |
L = 2.41 ± 0.10 R = 2.37 ± 0.15 |
||
| Academy forwards [63] | 9 | 119.4 ± 34.0 | 1.09 ± 0.07 | 1.82 ± 0.10 | 3.12 ± 0.11 | 5.52 ± 0.17 | |||||
| Academy backs [63] | 6 | 84.1 ± 27.5 | 1.05 ± 0.07 | 1.76 ± 0.12 | 3.02 ± 0.15 | 5.32 ± 0.22 | |||||
| Academy [60] | 15 | 19.2 + 1.0 |