FIGURE 3.

Individual hormonal responses from four athletes defined as naturally menstruating, with figures made to recreate those published by Elliot-Sale et al. (6). Each dot represents the measured hormone concentrations, with the dotted lines representing the predicted cyclical nature of the hormones across the menstrual cycle between testing days. The yellow line is estradiol, green is progesterone, blue is FSH and purple is LH. Each red line represents ovulation measured using urinary ovulation kits and the red shaded area represents the bleeding period.