An Exploratory, Retrospective Study on Injury Occurrence in Triathletes and Marathon Runners.

The study relied on self-reported data, which is subject to recall and response bias. The definition of cross-training was very broad (any activity other than running), making it difficult to distinguish between different types of supplemental exercise. Detailed information about injury types and severity was not captured, so participants may have defined 'injury' differently. The survey instrument did not undergo a reliability analysis. As a retrospective survey, it identifies associations but cannot prove that one activity causes another.

The authors declare no conflicts of interest relevant to the content of this manuscript.

Do not interpret the protective association of running and swimming as proof that these activities prevent injuries. The study is retrospective and self-reported, meaning athletes who are already injury-free may be the ones able to sustain higher volumes of these activities, rather than the activities themselves causing the lack of injury.