Introduction
Soccer has been the most popular sport for decades, with the largest number of participants worldwide. Its popularity is increasing among children and teenagers, both girls and boys, however, scientific interest is mainly focused on the male populationBy nature, soccer is a very irregular game. Even though over 90% of a game is covered by aerobic metabolism, soccer players need perform repeated short-duration (2–7 s), maximal or near maximal, multi-directional bouts throughout the game as these play a significant role in the crucial moments of the matchTraining is one of the components of the process of shaping physical capacity. The second component is the possibility of assessing the input state before the intervention and estimating the effects of the applied intervention. Throughout the training process, it should be remembered that the tests evaluating the fitness level/adaptation process and the training loads should be selected adequately to the age/maturity and exercise capacity of the subjects. This ensures accurate assessment of fitness and effective development of capacity through exercise intervention.Despite the extensive literature on various aspects of footballThe research aimed to determine whether the running-based anaerobic sprint test can effectively estimate anaerobic performance in young girls, regardless of their training status or performance level. To confirm this, the study evaluated the relationship between performance variables obtained in the RAST and the WAnT tests in U12 untrained girls and soccer players in pre-season training. The correlation between the anaerobic capacity parameters obtained in these two tests, both before and after 8 weeks of soccer training, was used to assess the fitness of young female athletes and confirm the usefulness of the RAST for evaluating anaerobic capacity in girls' football training. Additionally, comparing the anaerobic performance of soccer-trained and untrained girls using these two structurally different tests may provide insight into the methods used for estimating anaerobic performance in young girls.