Participants
POLAND
Forty elite young soccer players took part in the study. Unfortunately, due to the COVID-19 pandemic and other random occurrences, only 24 players completed the project (age: 17.2 ± 1.16 years, body mass: 70.2 ± 5.84, body height: 179.1 ± 4.26 cm, and BMI: 21.9 ± 1.7 kg/mInjuries and illnesses prevented five players from continuing the research. The rest of the group (The study timeline and flowchart of the participants.Ethical approval was received from the Local Bioethics Medical Committee in Gdansk (Poland) (KB consent number − 26/19). The study was conducted in accordance with the Helsinki Declaration of 2013. Following familiarization and explanation of the study objectives, procedures, and methodology, all participants consented to participate. All the participants or their legal guardians were requested to sign the informed consent form.