| 
  
    | Table 1. Mean (SD) demographic characteristics of participants. |  
    | 
| Age, years | 15.6 (.5) |  
| Time from peak height velocity, year | +3.1 (.5) |  
| Height, m | 1.64 (.06) |  
| Body mass [kg] | 56.8 (5.8) |  
| Fat mass [%] | 17.3 (3.7) |  
| Average soccer training volume, sessions per weeks | 9.3 (.5) |  |  |