OBJECTIVE: The aim of this study was to analyze the blood serum levels of CTX-II in professional indoor soccer players, at three different times during one season: at the start of the pre-season, four months later (a time that marks the middle of the season) and at the end of the season.METHODS: Fourteen male soccer players of mean age 19 years were included. Blood samples of 3 mL were collected from each indiv...