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Hormones and Your Body: 6 Surprising Effects

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The truth about what hormones really do.

Surprises 1-3

Despite all those tired that-time-of-the-month punch lines, hormones are no joke. Scientists now say that fluctuating hormones can boost your emotional well-being -- and they can exacerbate chronic health conditions and increase your risk of injury while exercising. "They affect your entire body, not just your reproductive system" says Hadine Joffe, MD, director of endocrine studies at Massachusetts General Hospital in Boston.

Surprise #1

Your hormonal shifts may make you susceptible to an exercise injury.

Research suggests that women are four to six times more likely than men to experience a painful knee injury, such as tearing the knee's anterior curciate ligament (ACL), while playing sports such as soccer, basketball, or volleyball. One reason: "Hormones appear to affect a woman's neuromuscular control -- the order and timing in which your muscles contract," says Gregory Dedrick, ScD, an assistant professor in the department of rehabilitation sciences at Texas Tech University Health Sciences Center in Lubbock, Texas. When Dedrick studied women with normal periods, he found that during the first half of their menstrual cycles (when estrogen is the dominant hormone), the way they landed after jumping was off compared to how they landed later in their cycles (when progesterone is the dominant hormone). The timing of the muscles the women used was different, which may help explain their increased risk of injury.

Expert advice: Any time both feet come off the ground -- whether you're dancing or playing soccer -- landing properly can greatly reduce the risk of a knee injury, says Paul Frediani, a personal trainer at Elysium Fitness in New York City. Try to land softly on the pads of your feet, followed by your heels, allowing your ankles, legs, and hips to absorb the shock. "Your knees should be directly over your feet, parallel to the ground, and face the same direction as your toes," Frediani says. And strengthen those hamstrings! "They act as stabilizers to your knees, so the stronger they are, the more your knees are protected," he explains.

Surprise #2

Hormones may affect how turned on your brain gets by smoking and other addictive behaviors.

In a recent study, when researchers had women play slot machines, they found that the female brain circuits linked to pleasure and reward were more active and responsive during the first half of their menstrual cycle than during the second. "This finding may provide insight into menstrual-related mood disorders, and why some women are more vulnerable to addictive drugs during the first part of their cycle," says Karen Berman, MD, chief of the section on integrative neuroimaging at the National Institute of Mental Health in Bethesda, Maryland.

Expert advice: Clearly, many addictive behaviors, such as smoking or relying too heavily on sleep aids, are unhealthy and require a doctor's attention. If you're trying to quit smoking, your doctor may suggest smoking-cessation aids to help you through the tough times. (Exercise is one therapy doctors often recommend.)

Surprise #3

Monthly hormonal changes may cause a health problem to flare up unexpectedly.

Many women report that symptoms of asthma, diabetes, lupus, migraines, and depression are more difficult to control during the last two weeks of their menstrual cycle, a phenomenon known as premenstrual exacerbation. Researchers believe that shifting hormones are to blame. "For some women, a health problem can become unmanageable due to severe premenstrual symptoms," says Diana Dell, MD, an assistant professor of psychiatry and obstetrics-gynecology at Duke University Medical Center in Durham, North Carolina. "We don't know the mechanism, but we see it often enough to know it exists."

Expert advice: Track your symptoms in a journal for at least a month. Mark the start and end dates of your period, then show the journal to your doctor. She may be able to tweak your medication or prescribe an additional one to better control your symptoms, says Dr. Dell.

Next:  Surprises 4-6


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