Objective To describe the injury incidence according to each phase of menstrual cycle (MC) in professional futsal players along two consecutive season and, secondly, to compare the injury incidence and frequency between different phases of the MC. Design Prospective cohort study. Settings Elite futsal players. Participants 179 players. Main outcome measure Players were registered along two consecutive seasons. Results 191 injuries were reported throughout both seasons. The injury incidence was 30.63 days-off during the follicular phase, 23.6 during ovulatory phase and 17.59 days-off in luteal phase, showing higher incidence during the follicular phase. No statistical differences (p > 0.05) were reported for any variable comparing among the three phases of MC. Conclusions This study suggests the relevance to track the MC, but reduces its possible relationship or influence on the injury distribution during each phase of the MC. The knowledge of injury incidence, burden and etiology is a key factor to design injury prevention programs with the focus on the most common injuries, where MC could be included as a complementary factor. Highlights • Injury incidence and injury burden did not show statistical differences among follicular, ovulatory and luteal phases. • Two of each three sprains happened during the follicular phase. • No differences in injury incidence were shown in variables like: type of session, day of week or phase of session.
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