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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)

From: Applied Sport Science for Male Age-Grade Rugby Union in England

Age categoryLevel and positionSample 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 14Academy [64]5     446 ± 114   
Under 15Academy [64]19     529 ± 60   
Under 16Academy [62]2988.8 ± 41.91.05 ± 0.091.82 ± 0.123.10 ± 0.195.66 ± 0.37426 ± 67L = 2.51 ± 0.17
R = 2.54 ± 0.14
1145 ± 33718.4 ± 1.3
Academy forwards [63]15109.7 ± 44.61.09 ± 0.111.88 ± 0.123.21 ± 0.185.87 ± 0.30  971 ± 32818.0 ± 1.4
Academy backs [63]1464.2 ± 20.21.01 ± 0.051.77 ± 0.082.99 ± 0.155.45 ± 0.31  1347 ± 22118.8 ± 1.1
Academy [64]23     563 ± 75   
Academy [60]48        18.9 ± 1.1
Under 17Academy [64]4     609 ± 57   
Under 18Academy [62]2386.7 ± 21.31.06 ± 0.041.81 ± 0.063.09 ± 0.125.51 ± 0.24482 ± 54L = 2.57 ± 0.12
R = 2.52 ± 0.13
1225 ± 37418.6 ± 1.1
Academy Forwards [63]1298.2 ± 20.11.07 ± 0.051.84 ± 0.063.14 ± 0.105.63 ± 0.21  1080 ± 24018.2 ± 1.1
Academy backs [63]1272.7 ± 12.91.05 ± 0.041.79 ± 0.063.02 ± 0.105.34 ± 0.17  1467 ± 45119.2 ± 1.0
School [65]129  1.84 ± 0.113.15 ± 0.185.67 ± 0.31  1022 ± 515 
Academy [65]55  1.82 ± 0.083.10 ± 0.135.52 ± 0.27  1245 ± 451 
Academy [61]14 1.04 ± 0.041.80 ± 0.063.12 ± 0.105.57 ± 0.22    
School [46]35  1.90 ± 0.093.23 ± 0.135.80 ± 0.24443 ± 58   
Academy [60]27        19.1 ± 1.1
Under 21Academy [62]15105.3 ± 35.41.07 ± 0.071.79 ± 0.103.07 ± 0.135.43 ± 0.21535 ± 70L = 2.41 ± 0.10
R = 2.37 ± 0.15
  
Academy forwards [63]9119.4 ± 34.01.09 ± 0.071.82 ± 0.103.12 ± 0.115.52 ± 0.17    
Academy backs [63]684.1 ± 27.51.05 ± 0.071.76 ± 0.123.02 ± 0.155.32 ± 0.22    
Academy [60]15        19.2 + 1.0
  1. Please note initial sprint momentum was calculated at 8–12 m [64] and 0–10 m [62], respectively
  2. 505 agility 505 test, Yo-Yo IRTL1 Yo-Yo intermittent recovery test level 1, 30–15 30–15 intermittent fitness test, L left, R right