Table 3.
Body composition and bioimpedance patterns: development trajectories of the soccer players according to years from peak of velocity (years).
| Breakpoints in Development (Years) | Rate of Player Development | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Variable | Breakpoint 1. (95% CI) | Breakpoint 2. (95% CI) | Slope 1 (95% CI) | p-Value | Slope 2 (95% CI) | p-Value | Slope 3 (95% CI) | p-Value | r2 |
| FFM | −2.2 (−2.8; −1.6) | 1.3 (1.0; 1.6) | 3.9 (1.7; 6.0) | <0.001 | 7.2 (6.4; 8.0) | <0.001 | −0.1 (−1.5; 1.5) | 0.50 | 0.91 |
| TBW | −1.8 (−2.4; −1.2) | 1.3 (0.6; 2.0) | 2.2 (1.0; 3.4) | <0.001 | 5.1 (4.3; 5.9) | <0.001 | 1.6 (0.4; 2.8) | <0.01 | 0.91 |
| BCM | −0.9 (−1.6; −0.2) | 0.4 (−0.5;1.3) | 1.0 (0.5; 1.5) | <0.001 | 4.7 (2.9; 6.5) | <0.001 | 1.9 (1.3; 2.5) | <0.001 | 0.85 |
| UMA | −1.7 (−2.4; −1.0) | 0.9 (0.3; 1.5) | 2.2 (0.1; 4.4) | 0.02 | 7.1 (5.4; 8.8) | <0.001 | −0.3 (−2.3; 1.7) | 0.37 | 0.76 |
| CMA | 1.3 (0.7; 1.9) | - | 7.9 (6.6; 9.2) | <0.001 | −3.5 (−8.5; 1.5) | 0.08 | - | - | 0.56 |
| TMA | 1.3 (0.5; 2.1) | - | 18.3 (16.1; 20.5) | <0.001 | 4.1 (−3.7; 12.0) | 0.15 | - | - | 0.78 |
| VL/H | 1.1 (0.6; 1.6) | - | −42.8 (−47.0; −38.6) | <0.001 | −9.6 (−23.4; 4.2) | 0.09 | - | - | 0.83 |
| PA | −1.5 (−2.3; −0.7) | - | −0.0 (−0.2; 0.2) | 0.44 | 0.4 (0.3; 0.5) | <0.001 | - | - | 0.56 |
Note: CI = confidence interval; FFM = fat free mass; TBW = total body water, BCM = body cell mass; UMA = upper arm muscle area; CMA = calf muscle area; TMA = thigh muscle area; PA = phase angle; VL/H = vector length standardized for height; statistically significance set at p < 0.05.