Team Management of the Female Athlete Triad: Part 1: What to Look for, What to Ask
Elizabeth Joy, MD; Nancy Clark, MS, RD; Mary Lloyd Ireland, MD; Joseph Martire, MD; Aurelia Nattiv, MD; Steve Varechok, LCSWTHE PHYSICIAN AND SPORTSMEDICINE - VOL 25 - NO. 3 - MARCH 97
This is the first of two roundtable articles on the female athlete triad. The second, on treatment and prevention, will appear in the April issue.
In Brief: The female athlete triad of disordered eating, amenorrhea, and osteoporosis affects many active women and girls, especially those in sports that emphasize appearance or leanness. Because of the athlete's psychological defense mechanisms and the stigma surrounding disordered eating, physicians may need to ask targeted questions about nutrition habits when assessing a patient who has a stress fracture or amenorrhea, or during preparticipation exams. Carefully worded questions can help. Physical signs and symptoms include unexplained recurrent or stress fracture, dry hair, low body temperature, lanugo, and fatigue. Targeted lab tests to assess nutritional and hormonal status are essential in making a diagnosis that will steer treatment, as are optimal radiologic tests like dual-energy x-ray absorptiometry for assessing bone density.
Today's female gymnast weighs almost 20 lb less than her counterpart of 20 years ago. Examples such as this of a heightened focus on thinness have been cited as a factor in disordered eating among female athletes, especially those participating in sports that emphasize appearance or leanness, or those that involve weight classifications. In addition, eating disorders are often accompanied by amenorrhea and osteoporosis; these three conditions are known collectively as the female athlete triad.
Because of their unique role in patient care, primary physicians especially need to be aware of what to look for and what questions to ask in diagnosing this often insidious syndrome. They also need to work with other members of the healthcare team as they make a diagnosis that will lead to appropriate treatment of all underlying problems.
Prevalence of the Triad
Joy: What is the general prevalence of disordered eating and menstrual dysfunction in female athletes?
Nattiv: Prevalence data on disordered eating in athletes are limited to a few studies (1-5). Most studies have used self-reporting from surveys that have differed significantly in the types of questions asked and in the screening tools used. The athletic population investigated also varies, making it difficult to draw conclusions about the true prevalence. In the United States, studies suggest, based on limited data, a prevalence in female athletes between 15% and 62% (1-3). However, because there is no true consensus on the definition of disordered eating and no validated screening tool in athletes that best detects individuals at risk, the true prevalence is not known.
The reported prevalence of athletic amenorrhea also depends on the definitions used. Most studies define amenorrhea as cessation of menses for at least 3 to 6 months, or fewer than three cycles per year (in women who have already been menstruating).
Most data show a prevalence of amenorrhea between 3.4% and 66% (6-9). In elite athletes, the prevalence is probably on the higher end, especially in sports in which poor nutrition habits are practiced and a lean physique is emphasized.
What appears to be a critical factor with regard to bone health is the cumulative estrogen exposure that a woman experiences in a given time period. As Drinkwater and colleagues have illustrated (10,11), the severity of menstrual dysfunction, based on menstrual history and current status, appears to be linearly associated with a decrease in bone mineral density.
Joy: Of female athletes who sustain stress fractures, what percentage also have disordered eating and/or menstrual irregularity?
Ireland: I can't cite percentages, but I am most concerned about high school athletes. Our region has a lot of thin cheerleaders and gymnasts, in whom we see a lot of spondylolysis and fibular and tibial stress fractures. Disordered eating is significantly underdiagnosed in these patients. Physicians should ask specifically about diet, past injury, and menstrual history.
Joy: What are some of the typical characteristics of those who have the triad?
Nattiv: Typically, the young woman is a perfectionist with high goals—athletically, as well as in other areas of her life (table 1). Being very critical of herself and having very high expectations and fairly low self-esteem is a recurrent pattern. An emphasis on maintenance of an "ideal body weight" or optimal body fat is also common.
Varechok: Most of these patients are dedicated athletes. They are very motivated, are achievement oriented, avoid taking shortcuts, and have a strong work ethic. They are not complacent about success. They tend to ignore or minimize minor injuries. Coaches tend to admire these traits, so affected athletes often elude detection.
Physicians need to be prepared for athletes who may deny or rationalize symptoms and minimize problems. Because an eating disorder is, in a lot of ways, a coping strategy, these athletes often hold on to their eating disorders tenaciously. If you get to know the athlete well enough—which can be difficult—you may see some fear of gaining weight, some obsession with calories. You may see mood swings, irritability, and depressive symptoms such as poor concentration, memory, and attention span.
The patient and her teammates will likely have a preoccupation with their bodies and dietary habits. These characteristics, however, are probably not going to be found in the physician's office, so communication with the athletic support staff and parents of younger athletes can provide good leads.
Joy: My experience as a primary care physician is that athletes first present with the triad in several ways. One is, they come in because they've had a dramatic weight loss, causing someone to suspect disordered eating (tables 2 and 3). Or they have a stress fracture or suspected stress fracture.
Key Questions in the History
Joy: What questions should primary care physicians ask regarding eating behaviors?
Ireland: I ask about menstrual cycle and nutrition history whenever I see a youngster with a stress fracture. I will usually refer the patient for an in-depth nutrition assessment and to a physician who has expertise in treating hormonal disorders in young female patients.
Clark: Some good questions to ask would be, "How much of an issue is weight for you?" (weight is an issue for most women, but the intensity varies) and "How do you rate your diet?"
If the patient says, "I try to eat very healthfully" or "My diet is very good," you should be cautious. What a patient sees as a wonderful diet could be nothing but fruits and vegetables. Or they could say "My diet is pretty bad," in which case they could be asking for help. I always ask about their protein intake, because protein in food tends to be coupled with fat and is therefore often severely restricted.
When getting background medical information I ask, "Do you currently have regular menstrual periods, and have you always?" If the client is amenorrheic, I will mention how amenorrheic female runners tend to have a 4.5 times higher risk of stress fracture than the average woman and talk about how food affects health. Another good question is, "How often do you take a day off from training?"
Joy: I'll ask "What's the most you've weighed in the last year, what's the least you've weighed in the last year, and what do you think your ideal weight is?" Because we typically have their current weight, I have found these questions to be very helpful.
Nattiv: Also, asking the athlete if she has certain "forbidden" foods (eg, chocolate, other desserts, nuts) that she will not allow herself to eat, can provide a tip-off. Another important question is, "Have you ever used laxatives or diet pills or made yourself vomit in the past?" If you address her past, it is less threatening, and I have found that patients are much more likely to admit to such practices even if they are still doing them.
Other questions I find helpful include asking if the athlete has ever used excessive exercise to control her weight in the past and if she is satisfied with her present weight or physique. If she is not satisfied, I ask her what she feels her ideal weight or percent body fat should be.
Varechok: Athletes who have disordered eating will tend to avoid straightforward questions about symptoms for fear of being identified. Sometimes physicians can word questions to be less threatening by using a nonauthoritative, open-ended approach to get the patient talking.
Joy: What questions do you ask in screening for menstrual dysfunction?
Nattiv: I usually start with the dietary questions because poor nutritional habits often coincide with menstrual dysfunction. A history of low body weight or an abrupt change in body weight may contribute to menstrual dysfunction. I also ask pointed questions about their menstrual history, because menstrual history, along with current menstrual status, is one of the best predictors of bone density. I ask when they started their period, and then have them detail how frequently they get their period. It's also helpful to ask if they have signs or symptoms of ovulation, such as changes in cervical mucous midcycle or midcycle cramps. Many athletes with menstrual dysfunction do not experience these.
Ireland: Some athletes are not aware that amenorrhea is a problem. A basketball player might say, "I menstruate in the summer months, but when I'm competitive I don't menstruate." When a patient says her periods are the same as always, the examiner needs to ask further. "The same as always" could mean 9 months of amenorrhea each year.
Other Historical Clues
Joy: Besides a history of stress fractures, are there other historical points that identify those at higher risk for osteoporosis? Are patients more likely to have acute injuries?
Ireland: Other than stress fractures, I have not seen any trend of serious acute injuries in young athletes who have the triad. Neither have I seen a stress fracture progress into a displaced, unstable fracture. These individuals may have recurrent stress fractures, but they will usually heal with reduction of axial loading and appropriate nutritional and hormonal assessment and treatment.
Bone health is a living homeostatic process, so we probably miss a lot of stress reactions when youngsters change activities or sit for a while. There probably are relatively painless bone reactions that we don't even see.
In addition, some athletes who have the triad seem to be repeat customers for soft-tissue injuries.
Clark: One of my patients with an eating disorder had been healthy for 2 years but got one injury, and then another and another. She described her body as a car whose wheels started falling off. It's amazing how long some of these athletes who have eating disorders can be healthy, but when they do get injuries, the injuries linger and, often, more come.
Ireland: Overuse injuries can result in stress fractures, but also sprains and strains. The effect of estrogen on muscle, ligament, meniscal, articular surface, and collagen tissues is not completely understood and probably underestimated. In particular, I see cheerleaders and gymnasts who have many recurrent lumbar strains and ankle sprains. Is this related to the sport, or are there multiple risk factors, including hormonal balance and nutrition?
Clark: The cause of injury can be multifactorial, with nutrition being one factor. If athletes have overuse injuries, the questions arise: Why are they overexercising? Is an eating disorder involved? For example, I counseled a woman who would eat a baked potato for 100 calories but would then have to run 10 miles afterward to burn them off. She got injured in that process, and poor nutrition was a part of her injury and lack of healing, but it was not the sole problem.
Emphasis on Calcium
Joy: Is low dietary calcium intake an independent risk factor for osteopenia in the adolescent and young adult female?
Nattiv: Myburgh et al (12) in 1990 showed that athletes who had a higher incidence of stress fractures also had lower calcium intakes as well as less use of birth control pills.
Clark: Weight-conscious teenage girls commonly drink a lot of diet soda but too little milk. They think milk is fattening, but they should have four servings a day of calcium-rich foods.
Ireland: If we think about calcium as a deposit in a bank, every healthcare provider should have major concerns if there's not enough calcium in the bank during the developmental years. If patients don't have the calcium stores then, they're going to run out of calcium early and then sustain a hip fracture at age 30 instead of at 70.
Clark: There's even a step before hip fractures. I know of one woman who was an amenorrheic runner in high school and college, and at age 29 has osteoporosis and doesn't know if her bones can support a pregnancy.
Joy: This is a real public health issue. We need to encourage young female adolescents to continue drinking milk.
Nattiv: At least in the postmenopausal population, studies show that 800 IU of vitamin D can prevent hip fractures. I recommend doses of 400 to 800 IU in younger athletic patients. Vitamin D can help with calcium absorption and may have additional beneficial effects on bone formation.
Physical Exam Findings
Joy: Let's talk about the classic physical exam findings. People with the restricting type of disordered eating like anorexia classically have physical signs of starvation (table 2). They often appear cachectic, or at least very thin, and have low body weight for height and low body fat. They can have bradycardia and hypotension. They have lanugo on the face and body, which is usually quite striking—patients are often referred to as "furry." They can have yellowish skin that may in part be due to increased beta-carotene intake.
Bulimia is harder to identify because these patients tend to be normal weight, but some have characteristic signs (table 3).
Nattiv: I agree that the bulimic population is tougher to identify. There's also a lot more denial in that group, often because of shame and feelings of guilt. With the self-induced vomiting you might see the "chipmunk cheeks" facial edema and peripheral edema. Individuals with bulimia are often normal weight or overweight. If the individual is very thin, she may be participating in both restrictive eating and bulimic behaviors, as they often coexist. But usually in the athletic population, you don't see these classic features of bulimia—patients look normal. In anorexia, orthostatic hypotension and the low pulse rate that you mentioned are very important, as well as hypothermia and cold intolerance.
Joy: I recently saw a 45-year-old runner who has chronic bulimia. She had some interesting physical exam findings, like abdominal striae from changes in weight. She would have rapid weight gains, then she would lose the weight with restricting-type behavior like extensive use of laxatives and self-induced vomiting.
Because of her chronic laxative use, she developed chronic megacolon and had abdominal distention and a tympanitic abdomen and all the symptomatology of megacolon. She would get petechiae in her sclera because of forceful vomiting. Those are things I've read about but don't see very often.
Primarily in the athletic population, you are going to see a younger patient whose disease hasn't been going on for quite as long, and she doesn't have some of the signs of chronicity of an older patient. But if a patient has abdominal complaints, the family physician must ask questions about disordered eating.
Clark: Patients very often have a grayish, unhealthy look and poor complexion. Their muscles are wasted. Many women express concern about their hair falling out.
Ireland: As an orthopedic surgeon who is aware of the underdiagnosis of disordered eating, I'm still not sure when I'm seeing it. We may identify the extreme cases, but the ones that are on the fence can be difficult. Young women who have a stress fracture may have some component of disordered eating.
I encourage caregivers of these young female athletes to think about being blunt and persistent. Ask the patient by herself and later with family, peers, and coaches about the possibility of her having disordered eating. Be up front if you are thinking about an eating disorder. It's probably there. A quote to remember is, "You may not have seen it, but it has seen you."
Nattiv: I think that with every stress fracture, orthopedists and primary care physicians need to ask about eating disorders and menstrual function. That should be a knee-jerk reaction and should be taught during residency training.
Joy: Should all amenorrheic athletes receive a pelvic exam?
Nattiv: It depends on age and other factors. I do not always do a pelvic exam in girls under 18 who have not been sexually active unless they have a history of primary amenorrhea. First, a medical work-up is indicated. Athletic amenorrhea is a diagnosis of exclusion and cannot be assumed in an athlete with menstrual dysfunction. If I start oral contraceptives, however, I do recommend a pelvic exam and Pap smear.
Joy: What laboratory tests do you consider essential in the workup of secondary amenorrhea? (The scope of this conversation is too limited to discuss primary amenorrhea.)
Nattiv: My basic workup for athletes includes tests for follicle-stimulating hormone (FSH), prolactin, and thyroid-stimulating hormone (TSH); a pregnancy test; and, usually, a complete blood cell count and chemistry panel because of the nutritional issues. If the patient is hirsute, has acne, or polycystic ovarian syndrome is suspected, I will often obtain a free testosterone and dehydroepiandrosterone sulfate (DHEA-S), and luteinizing hormone (LH) in addition.
A progesterone challenge test (with medroxyprogesterone acetate 10 mg/day for 7 to 10 days) can be helpful as an indirect assessment of estrogen status. Uterine bleeding after progesterone administration indicates that estrogen levels are usually not markedly decreased.
Joy: I sometimes get a serum estradiol test as well. If the FSH value is borderline and the estradiol level is less than 20 pg/mL, I'll usually prescribe oral contraceptives. In part, estradiol can be a motivator for taking birth control pills. Most patients understand estrogen and progesterone, so if their estrogen level is less than 20, you can show them the laboratory reference value that says "postmenopausal: less than 20," and say, "You have the estrogen level of a postmenopausal (or prepubertal) woman."
Joy: How extensive should bone scans be when a stress fracture is suspected?
Martire: The most common site of stress fractures is the leg; therefore, I do triple-phase technique of both legs from hip to ankle. This is not very time-consuming with a large-field-of-view camera, and I can look at a large area, which is important because pain is often referred. For low-back pain, I scan the entire thoracic to sacral spine, as well as the pelvis and hips. If I suspect osteoporosis, I ask the team physician for permission to do a dual-energy x-ray absorptiometry (DEXA) study to see if the athlete's bone density is below the female adult standard.
Triple-phase bone scans are the most common diagnostic imaging tests used to evaluate overuse injuries. Studies have shown that low bone-mineral density is a definite factor for the development of stress fractures in athletes (12). Obviously, when we do a bone scan we do not know whether a female patient is osteoporotic. Therefore, some of the things we might look for include multiple stress fracture, often in different stages of healing (eg, a new stress fracture in the tibia and an older, healing stress fracture in the tarsal navicular or os trigonum). Gymnasts and ballet dancers can have stress fractures in uncommon locations—such as the anterior tibia, proximal fibula, or medial malleolus—that may be difficult to heal. Finally, continuous or repetitive occurrence of stress fractures would be another tip-off of the female athlete triad.
Magnetic resonance imaging (MRI) can also be useful. It can detect early changes in bone and help differentiate stress fracture from other pathologic conditions.
Joy: When do you order a bone density study?
Nattiv: There are no guidelines in this age-group as yet, but I will offer it if the athlete has experienced a recurrent history of oligomenorrhea, or has more than 6 to 12 months of amenorrhea. It's more important to order a bone density study if you think it's going to change treatment. The information that the athlete receives from her assessment will often—especially if significant bone loss is revealed—personalize the problem enough to lead to better compliance.
Joy: I've heard of using other radiologic tests to evaluate people for osteoporosis, like ultrasound to look at bone microarchitecture. But I would say that most of us use DEXA. Is there any reason to order another test for bone density?
Martire: Most experts agree that DEXA is still the test of choice for bone densitometry. Other modalities—like MRI, quantitative computed tomography (QCT), and ultrasound—have their claims and backers, but nothing beats DEXA for availability, safety (radiation exposure), cost, ease of use, speed, accuracy, and reproducibility.
The DEXA test takes 20 to 30 minutes maximum with the patient supine and has a radiation dose of 3 to 10 millirems—a fraction of that from a single-view chest film and 1% of the dose of a QCT. DEXA is cheaper than QCT or MRI and has an error range of 1% to 3%, which matches the accuracy of any other test. The cost ranges from about $100 to $200 per study but will vary by region. The results are compared with standards in young female adults and assigned a plus or minus standard deviation.
In addition to its diagnostic value, abnormal DEXA can give a baseline for measuring efficacy of follow-up treatment. It can also provide a powerful quantitative stimulus to show the young female athlete how harmful her condition is.
Nattiv: Because patients sometimes think they are invincible, having the evidence from bone densitometry that shows they are two standard deviations below the mean can influence their health patterns. They are much more likely to follow the treatment program, such as taking birth control pills and ingesting more calcium.
Clark: But if you find that they're two standard deviations below the mean, do they sometimes have the opposite reaction: "It's hopeless, I'm doomed, I'm already way below the average"?
Nattiv: That's an important question. There can be negative repercussions. But this population may not have reached their peak bone density yet, so this can help motivate them to realize that there is still a small window of time to improve their bone health.
Joy: Another down side is, for example, in a young gymnast who hasn't had a period in 4 months and is eating 800 calories a day, but whose spine and femur are 120% of normal for her age. The test indicates that everything is fine, but she's setting herself up for serious bone-mineral loss down the road. The test result may lull her into a dangerous complacency.
Ireland: The bottom line is that physicians should have a specific reason for ordering any tests. They should ask themselves, "Will it change my treatment of this individual?"
Address correspondence to Elizabeth Joy, MD, Dept of Family and Preventive Medicine, 50 N Medical Dr, Salt Lake City, UT 84132.
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