Table 3. Descriptive statistics (mean ± standard deviation) for adolescent soccer players of contrasting skeletal maturity status and comparison of the ventilatory outputs between maturity groups expressed in absolute values and using ratio standard and scaled values.
|
Yi: Variable |
Xi: descriptor |
unit |
Descriptive statistics | Comparisons | Effect size | |||
|---|---|---|---|---|---|---|---|---|
| Average maturing (n = 18) |
Early maturing (n = 29) |
t | p | d-value | (qualitative) | |||
| Chronological Age | years | 14.01 ± 0.9 | 14.08 ± 0.8 | -0.255 | 0.80 | 0.07 | (trivial) | |
| Skeletal Age | years | 14.22 ± 1.00 | 16.02 ± 0.87 | -6.495 | 0.00 | 1.72 | (large) | |
| Stature | cm | 162.8 ± 10.5 | 170.3 ± 8.7 | -2.680 | 0.01 | 0.69 | (moderate) | |
| Body Mass | kg | 51.3 ± 10.4 | 59.6 ± 9.4 | -2.828 | 0.01 | 0.76 | (moderate) | |
| Fat-Free Mass | kg | 44.7 ± 8.6 | 51.7 ± 7.5 | -2.953 | 0.01 | 0.78 | (moderate) | |
| VT1: Speed | km·h-1 | 10.09 ± 1.61 | 10.51 ± 0.10 | -1.003 | 0.33 | 0.25 | (small) | |
| VT1: Absolute output | L·min-1 | 2.33 ± 0.55 | 2.71 ± 0.32 | -2.978 | 0.01 | 0.65 | (moderate) | |
| VT1: Relative output | Body mass | mL·kg-1·min-1 | 45.58 ± 5.20 | 45.94 ± 5.00 | -0.235 | 0.82 | 0.07 | (trivial) |
| mL·kg-0.801·min-1 | 99.37 ± 11.98 | 103.21 ± 9.12 | -1.243 | 0.22 | 0.31 | (small) | ||
| Fat-free mass | mL·kg-1·min-1 | 52.23 ± 6.44 | 52.80 ± 5.26 | -0.329 | 0.74 | 0.08 | (trivial) | |
| Stature | mL·cm-1·min-1 | 14.23 ± 2.66 | 15.88 ± 1.51 | -2.413 | 0.02 | 0.60 | (small) | |
| VT2: Speed | Speed | km·h-1 | 13.27 ± 1.21 | 13.84 ± 1.02 | -1.753 | 0.09 | 0.46 | (small) |
| VT2: Absolute output | L·min-1 | 2.84 ± 0.59 | 3.28 ± 0.50 | -2.724 | 0.01 | 0.71 | (moderate) | |
| VT2: Relative output | Body mass | mL·kg-1·min-1 | 55.46 ± 4.15 | 55.22 ± 4.75 | 0.177 | 0.86 | -0.06 | (trivial) |
| Fat-free mass | mL·kg-1·min-1 | 63.53 ± 4.83 | 63.50 ± 5.38 | 0.020 | 0.98 | -0.01 | (trivial) | |
| Stature | mL·cm-1·min-1 | 17.31 ± 2.74 | 19.18 ± 2.35 | -2.488 | 0.02 | 0.65 | (moderate) | |
| Speed at peak VO2 | km·h-1 | 15.53 ± 1.36 | 16.20 ± 0.89 | -1.844 | 0.08 | 0.47 | (small) | |
| Absolute peak VO2 | L·min-1 | 3.11 ± 0.67 | 3.61 ± 0.59 | -2.692 | 0.01 | 0.71 | (moderate) | |
| Relative peak VO2 | Body mass | mL·kg-1·min-1 | 60.72 ± 4.91 | 60.73 ± 4.87 | -0.004 | 1.00 | 0.00 | (trivial) |
| Fat-free mass | mL·kg-1·min-1 | 69.52 ± 5.43 | 69.85 ± 5.86 | -0.197 | 0.85 | 0.06 | (trivial) | |
| Stature | mL·cm-1·min-1 | 18.97 ± 3.15 | 21.12 ± 2.74 | -2.475 | 0.02 | 0.65 | (moderate) | |
Abbreviations: VT1, first ventilatory threshold; VT2, second ventilatory threshold; VO2peak, peak oxygen uptake.