Table 8.

Weighted means and standard deviations for physical qualities in male, adolescent rugby league players according to age group and test

Quality and test	12 years of age	13 years of age	14 years of age	15 years of age	16 years of age	17 years of age	18 years of age
Anthropometric quality
Height (cm)	–	171.58 ± 7.66	174.18 ± 6.26	176.61 ± 6.50	174.53 ± 5.44	179.34 ± 5.61	180.01 ± 5.30
Seated height (cm)	–	88.43 ± 4.24	88.55 ± 3.67	90.75 ± 3.24	–	91.83 ± 2.24	–
Body mass (kg)	50.68 ± 9.32c	65.42 ± 11.44	68.13 ± 10.98	75.36 ± 10.86	78.78 ± 9.95	84.89 ± 10.76	87.35 ± 9.91
Skinfold thickness (mm) using Σ4 sites	–	37.73 ± 15.40	38.72 ± 15.91	40.22 ± 15.54	36.81 ± 13.37	39.01 ± 12.50	37.44 ± 11.52
Skinfold thickness (mm) using Σ7 sites	–	–	73.3– ± 8.4–b	74.05 ± 22.13	73.45 ± 22.37	92.94 ± 35.92	–
Linear speed
10-m sprint time (s)	–	1.94 ± 0.12	1.94 ± 0.12	1.85 ± 0.13	1.80 ± 0.06	1.81 ± 0.62	1.81 ± 0.07
20-m sprint time (s)	–	3.36 ± 0.17	3.37 ± 0.17	3.11 ± 0.16	3.11 ± 0.09	3.11 ± 0.10	3.10 ± 0.12
Change-of-direction speed
505 Agility Test(s)a	–	2.52 ± 0.15	2.49 ± 0.15	2.50 ± 0.15	2.30 ± 0.13	–	–
L-run (s)	–	–	–	–		8.60 ± 0.40	8.7 ± 0.4
Aerobic capacity
MSFT (predicted $\dot{\mathrm{V}}$O2max in mL kg−1 min−1)	34.23 ± 4.16c	47.50 ± 4.97	48.47 ± 5.11	49.58 ± 4.58	47.26 ± 0.51	46.65 ± 6.17	48.50 ± 2.90b
Yo-Yo Intermittent Recovery Test Level I (m)	–	–	1027 ± 510I	810.6 ± 276.76	1365.51 ± 361.85	915.65 ± 247.58	1192.35 ± 367.80
Muscular strength
Bench press 1RMb	–	–		74.38 ± 12.83	93.48 ± 13.41	99.84 ± 16.02	112.82 ± 16.25
Back squat 1RMb	–	–		99.62 ± 19.92	122.63 ± 17.98	126.83 ± 17.71	137.99 ± 19.27
Prone row 1RMb	–	–	–	71.59 ± 9.89	83.65 ± 10.26	87.35 ± 10.81	97.13 ± 7.80
Muscular power
Medicine ball throw (m)	–	5.47 ± 0.82	5.81 ± 0.70	6.25 ± 0.77	–	7.01 ± 0.80	–

MSFT multistage fitness test

^aData reported are weighted means combined as right foot and unidentified

^bOne repetition maximum

^cData from a single study and therefore not weighted across multiple studies

– data not reported