METHODS
This is a prospective observational cross-sectional study performed with convenience sampling: volunteer women. They signed a free and informed consent form approved by the Research Ethics Committee of the University Center of Brasilia (Centro Universitário de Brasília), whose process number was 1.791779.
The inclusion criteria comprised Brazilian women enrolled in the 2017 Brazil CrossFit® Championship (TCB) who succeeded in the first selection phase of the championship.
The championship selected 48 female athletes in the main category. The volunteers in this study were high-performance female athletes, CrossFit® practitioners for over a year, aged 20 to 34 years, not using any oral contraceptive. Among them, only eight female athletes accepted to participate in this research and met the inclusion criteria, which corresponded to a sample of 16.6%.