The goal of this observational study is to evaluate the safety of heading in football. We will study the release of biomarkers in blood that reflect microscopic neural damage. The main questions this study aims to answer are: * Does participation in a football match lead to a change in biomarkers that reflect microscopic neural damage? * Is the dose of exposure during a football match related to the magnitude of change in biomarkers that reflect microscopic neural damage? Participants will participate in a regular football match and provide blood samples before and right after the football match. The football match will be recorded on video to count the number of headers of all participants.
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Concentration of serum neurofilament light protein
Timeframe: T0 (<1hour pre-match), T1 (<1hour post-match), T2 (<48hour post-match)