Table 1 Sample sizes and descriptive statistics (mean [M], standard deviation [SD]) for chronological age (CA), skeletal age (SA), height, weight, estimated body composition, and motor performances of soccer players 9–12 and 13–16 years, and results of the analyses of variance comparing the two CA groups.
9–12 years | 13–16 years | F* | |||||
|---|---|---|---|---|---|---|---|
n | M | SD | n | M | SD | ||
CA, yrs | 60 | 11.3 | 0.9 | 52 | 14.5 | 1.0 | 294.05 |
Fels SA, yrs | 60 | 11.9 | 1.7 | 52 | 15.7 | 1.3 | 168.93 |
Height, cm | 60 | 147.5 | 8.4 | 52 | 168.6 | 9.0 | 166.44 |
Weight, kg | 60 | 38.1 | 7.0 | 52 | 56.6 | 8.7 | 154.23 |
Fat-free mass, kg | 60 | 31.3 | 5.5 | 51 | 47.6 | 7.4 | 176.41 |
Fat mass, kg | 60 | 6.8 | 1.9 | 51 | 8.8 | 1.8 | 29.26 |
Fat mass, % | 60 | 17.8 | 2.7 | 51 | 15.6 | 2.3 | 19.72 |
Grip strength, sum R + L, kg | 59 | 38.1 | 7.6 | 51 | 68.9 | 13.9 | 214.03 |
5 m sprint, sec | 58 | 1.17 | 0.09 | 43 | 1.07 | 0.07 | 34.13 |
20 m sprint, sec | 58 | 3.58 | 0.21 | 43 | 3.13 | 0.20 | 119.13 |
Acceleration, from 10 to 20 m, sec | 58 | 2.04 | 0.12 | 43 | 1.81 | 0.11 | 103.44 |
Agility, sec | 57 | 13.22 | 0.72 | 42 | 12.58 | 0.49 | 24.57 |
Vertical jump, cm | 56 | 36.7 | 6.5 | 42 | 49.8 | 9.7 | 63.74 |
Endurance run, distance, m | 34 | 1526 | 533 | ||||
