Hyperandrogenicity is an alternative mechanism underlying oligomenorrhea or amenorrhea in female athletes and may improve physical performance  Anette Rickenlund, M.D., Kjell Carlström, Ph.D., B.jörn Ekblom, Ph.D., Torkel B. Brismar, M.D., Ph.D., B.o von Schoultz, M.D., Ph.D.,, Angelica Lindén Hirschberg, M.D., Ph.D.  Fertility and Sterility  Volume 79, Issue 4, Pages 947-955 (April 2003) DOI: 10.1016/S0015-0282(02)04850-1

FIGURE 1 Individual values of the T-SHBG ratio in oligoamenorrheic or amenorrheic athletes (OAM), regularly menstruating athletes (RM), and sedentary controls (CTR). The clinical cutoff value of the T-SHBG ratio for hyperandrogenism (0.05) is indicated. Rickenlund. Hyperandrogenicity among female athletes. Fertil Steril 2003. Fertility and Sterility 2003 79, 947-955DOI: (10.1016/S0015-0282(02)04850-1)

FIGURE 2 Individual values of free T, SHBG, A, and LH-FSH ratio in hyperandrogenic, oligoamenorrheic, or amenorrheic athletes (H-OAM); normoandrogenic oligoamenorrheic or amenorrheic athletes (N-OAM); regularly menstruating athletes (RM); and sedentary controls (CTR). Significant differences between H-OAM and the other groups are indicated. *P=.05, **P=.01, ***P=.001. Rickenlund. Hyperandrogenicity among female athletes. Fertil Steril 2003. Fertility and Sterility 2003 79, 947-955DOI: (10.1016/S0015-0282(02)04850-1)