Word: frisch
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...Frisch also concluded that some women athletes, who have lost a significant amount of body weight due to strenuous exercise, experience menstrual dysfunction and may become temporarily infertile...
...hypothalamus normally sends out a [hormone] signal that puts the reproductive system on 'go,'" Frisch says. If body weight is too low, the brain will not send any hormonal signals to the reproductive organs, and menstruation will not occur, she says. Once exercise is cut back and weight is regained, the menstrual cycle and ovulation will be restored, and pregnancy will be possible. "The situation is not irreversible," she says...
...Frisch has determined that if a woman weighs 10 to 15 percent below her normal weight, her reproductive cycle will be turned off. Doctors have even created a "fatness index," indicating the minimum amount a woman must weigh to be fertile. Women who become infertile can refer to this index to discover the weight they need to regain fertility, assuming nothing else is wrong, Frisch says...
...Frisch, who works at the Center for Population Studies, conducted yet another analysis in 1985 of more than 5000 college alumnae, some of whom participated in athletics. "The alumni who had exercised in college had less cancer of the breast and reproductive system," she says...
...following year, Frisch determined further from the same data pool that the athletic women, who were between 20 and 80 years of age, had a lower lifetime occurrence of benign tumors and diabetes...