Scanning through the references in what is supposedly a review article is interesting. 3 or 4 sports science journals, 3 or 4 endocrinology journals, 1 medical paper.
The rest are sports psychology journals, transgender study journals and a huge number of references to the inclusion policies of various sports governing bodies (including quidditch - I leave that on the table without comment).
Oh, and of course Joanna Harper's infamous "I asked 8 of my mates if their performance had dropped off" paper.
Compare that to Ross Tucker's exhaustive research review for world rugby where he looked at 84 papers directly on sporting performance.