Menstrual characteristics of participants. This figure displays the menstrual characteristics of exercising ovulatory (ExOv) (A), exercising with inconsistent menstrual cycles (ExIncon) (B), exercising anovulatory (ExAnov) (C), exercising oligomenorrheic (ExOligo) (D), and exercising amenorrheic (ExAmen) (E) participants. The estrone-1-glucuronide (E1G) (ng/ml) and pregnanediol-glucuronide (PdG) (μg/ml) data for the ExOv and ExIncon participants are aligned by the day of the LH peak, defined as day 0. The number of days depicted for the ExOv, ExIncon, ExAnov, and ExOligo participants represents the mean cycle length for these participants. The number of days depicted for the ExAmen participants represents the menstrual collection period, 28 days. Data are reported as mean ± SEM of the one to three menstrual cycles per participant such that each participant’s data are represented once in the figure.