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)

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