Table 6.
The body composition in group of boys participating in a national athletics program and pair-matched control group of boys.
| The Assessed Parameters | Boys Participating in a National Athletics Program (n = 210) | Boys Non-Participating in a National Athletics Program (n = 210) | p-Value ** | ||
|---|---|---|---|---|---|
| Mean ± SD | Median (Minimum–Maximum) | Mean ± SD | Median (Minimum–Maximum) | ||
| Body cell mass (kg) | 19.50 ± 4.58 | 19.10 * (8.90–35.70) |
19.40 ± 4.91 | 18.55 * (10.90–43.50) |
0.6416 |
| Body cell mass (%) | 52.05 ± 4.27 | 52.40 * (8.20–60.20) |
51.83 ± 4.01 | 51.80 * (42.80–87.70) |
0.0055 |
| Body cell mass index (kg/m2) | 7.67 ± 1.08 | 7.70 (4.50–10.80) |
7.74 ± 1.36 | 7.65 * (5.40–15.50) |
0.8992 |
| Fat-free mass (kg) | 37.17 ± 7.87 | 36.70 * (18.80–68.50) |
37.42 ± 8.33 | 36.15 * (21.20–79.70) |
0.9132 |
| Fat-free mass (%) | 79.15 ± 6.41 | 79.90 * (55.70–91.90) |
75.64 ± 7.40 | 76.00 (55.30–99.30) |
0.0000 |
| Fat mass (kg) | 10.05 ± 5.05 | 9.20 * (3.10–51.50) |
12.96 ± 7.42 | 11.75 * (0.20–64.30) |
<0.0001 |
| Fat mass (%) | 20.85 ± 6.41 | 20.10 * (8.10–44.30) |
24.63 ± 8.24 | 24.25 * (0.70–77.10) |
<0.0001 |
| Total body water (kg) | 30.62 ± 5.11 | 30.50 (14.50–49.60) |
30.62 ± 5.29 | 30.00 * (13.90–56.30) |
0.7692 |
| Total body water (%) | 65.55 ± 7.45 | 66.20 * (7.90–81.00) |
62.84 ± 8.21 | 62.75 * (22.90–86.70) |
0.0001 |
| Na/K ratio (-) | 1.13 ± 0.14 | 1.10 * (0.40–2.00) |
1.10 ± 0.13 | 1.10 * (0.70–1.50) |
0.0640 |
| Extracellular water (kg) | 12.76 ± 2.86 | 12.30 * (7.00–20.80) |
12.60 ± 3.23 | 11.90 * (6.70–36.70) |
0.3852 |
| Extracellular water (%) | 41.17 ± 3.73 | 41.40 * (10.30–50.00) |
40.39 ± 3.19 | 40.00 * (32.20–60.50) |
0.0021 |
| Intracellular water (kg) | 17.86 ± 2.45 | 17.80 * (7.50–29.80) |
18.33 ± 2.69 | 18.00 * (11.60–34.00) |
0.2453 |
| Intracellular water (%) | 58.68 ± 3.14 | 58.60 * (50.00–65.90) |
59.66 ± 3.07 | 60.00 * (45.80–67.80) |
0.0013 |
| Muscle mass (kg) | 24.08 ± 5.62 | 23.50 * (11.20–43.50) |
23.91 ± 6.05 | 23.00 * (13.40–52.80) |
0.5597 |
| Muscle mass (%) | 51.00 ± 6.19 | 51.35 * (5.90–64.90) |
48.25 ± 6.15 | 48.35 * (32.70–83.90) |
<0.0001 |
* Nonparametric distribution (verified using Shapiro-Wilk test; p ≤ 0.05); ** compared using t-Student test (for parametric distribution) and Mann-Whitney U test (for nonparametric distribution).