Data preparation
The injuries were organized in number and percentage according to the location, type, mechanism, recurrence. The hours of training and games were calculated based on the weekly schedule that was sent to us by email by the coordination of the club. For each field training, of all categories, two hours and thirty minutes were considered. Regarding the games, for the sub 15 category, each game counted as 1 hour, for the sub 17 category each game counted as an hour and 20 minutes, and for the sub 20 category, each game counted as an hour and 30 minutes.