i68
SUPPLEMENT
The female football player, disordered eating, menstrual
function and bone health
Jorunn Sundgot-Borgen, Monica Klungland Torstveit
...................................................................................................................................
See end of article for
authors’ affiliations
........................
Correspondence to:
Jorunn Sundgot-Borgen, The
Norwegian School of Sport
Sciences, Oslo, Norway;
jorunn.sundgot-borgen@
nih.no
Accepted 25 June 2007
Published Online First
3 July 2007
........................
Br J Sports Med 2007;41(Suppl I):i68–i72. doi: 10.1136/bjsm.2007.038018
Most female football players are healthy. However, recent findings from our studies on Norwegian female
elite athletes also show that football players are dieting and experiencing eating disorders, menstrual
dysfunction and stress fractures. Dieting behaviour and lack of knowledge of the energy needs of the athlete
often leads to energy deficit, menstrual dysfunction and increased risk of bone mass loss. Although dieting,
eating disorders and menstrual dysfunction are less common than in many other sports, it is important to be
aware of the problem as eating disorders in female athletes can easily be missed. Therefore, individuals,
including the players themselves, coaches, administrators and family members, who are involved in
competitive football, should be educated about the three interrelated components of the female athlete triad
(disordered eating, menstrual dysfunction and low bone mass), and strategies should be developed to
prevent, recognise and treat the triad components.
T
he term female athlete triad (the triad) refers to three
interrelated conditions: disordered eating (DE), menstrual
dysfunction and low bone mass.1 Some female athletes do
not consider training or exercise sufficient to accomplish their
idealised body shape and a significant number diet and use
harmful weight-loss practices to achieve their goals.2–4 This
behaviour may lead to one or more of the triad components.
Each disorder of the triad increases the risk of morbidity and
mortality, but the dangers of the three together are synergistic.5
This article addresses three aspects of the female athlete triad
in connection with football players: (i) the nature and
prevalence of DE and eating disorders (EDs), (ii) menstrual
function and bone health in football players, and (iii) how to
help players who have one or more of the triad components.
Results from our latest study on the triad in Norwegian elite
athletes will be included6 7 and data concerning football players,
handball players and endurance athletes will be presented.
Our study6 7 was conducted in three phases: screening by means
of a detailed questionnaire (part I), measurement of bone mineral
density (BMD) (part II) and clinical interview (part III). In part I,
all female elite athletes aged 13–39 years and representing the
national teams at junior and senior level (n = 938) and an age
group-matched randomly selected population-based control
group (n = 900) were invited to participate. The questionnaire
was completed by 88% of the athletes and 70% of the controls.
Based on data from part I, a stratified random sample of athletes
(n = 300) and controls (n = 300) was selected and invited to
participate in parts II and III of the study.6–8 Data from parts I–III
are presented in table 1 and figs 1 and 2.
ENERGY AVAILABILITY, DISORDERED EATING AND
EATING DISORDERS
Definitions
Most athletes with low energy availability have reduced their
dietary energy intake without reducing their exercise energy
expenditure. Some athletes practice abnormal eating behaviours ranging from restrictive eating to anorexia nervosa (AN)9
and including fasting, vomiting, diet pills, laxatives, diuretics
and enemas.10 11 Binge eating is also common in athletes with
restrictive eating.12
The second way to reduce energy availability is to increase
exercise energy expenditure without increasing energy intake. The
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body has no automatic mechanism for matching energy intake to
activity-induced energy expenditure.13 Dietary restriction increases
hunger, but the same energy deficit produced by exercise does
not.14 The energy deficits resulting from inadequate ad libitum
energy intake are more extreme when consuming a high
carbohydrate diet such as those recommended for endurance
athletes.15–17 Inadvertent low energy availability may occur without clinical EDs, DE behaviours or even dietary restriction.12 16 18
DE behaviour is characterised by disturbances in eating
behaviour, body image, emotions and relationships.1 AN is the
most extreme restrictive eating behaviour in which an individual
continues to starve and feel fat in spite of being 15% or more
below an ideal body weight. Bulimic behaviour refers to a cycle of
food restriction or fasting followed by binging and purging. AN
and bulimia nervosa (BN) are clinical EDs.19
The eating disorder not otherwise specified category (EDNOS) refers to disorders of eating that do not meet the criteria
for any specific EDs. This category acknowledges the existence
and importance of a variety of eating disturbances.
Athletes constitute a unique population and special diagnostic considerations should be taken into account when
working with this group.20–22
Prevalence
The prevalence of DE behaviour and EDs among athletes has
been estimated to range from 1% to 62%.3 Prevalence seems to
be higher in elite athletes when compared to athletes and lower
competitive
level
individuals
and
controls.3 4 12 23 24
Furthermore, DE and EDs are more frequent among female
athletes competing in aesthetic, weight-class and endurance
sports than among athletes competing in sports where leanness
is considered less important.2 4 7 25
In our recent study, 32% of football players reported a history of
dieting. This is a lower percentage than the reported number of
dieting athletes in other sports.6 7 12 All these dieting football
players had body mass index values within the recommended
level (table 1).26 Also a significantly lower percentage of football
Abbreviations: ACSM, American College of Sport Medicine; AN,
anorexia nervosa; BMD, bone mineral density; BN, bulimia nervosa; DE,
disordered eating; ED, eating disorder; ED-NOS, eating disorder not
otherwise specified; LH, luteinsing hormone
The female football player
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Table 1 Characteristics of the total population of athletes
Age, mean (SD) (years)
BMI, mean (SD) (kg/m2)
Training, mean (SD) (hours/week)
Eating disorders*
Current use of oral contraceptives
Current menstrual dysfunction`
Stress fractures
Football (n = 69)
Handball (n = 60)
Endurance (n = 115)
Controls (n = 607)
19.6 (4.1)
21.5 (1.6)
12.3 (3.7)
5.9%
35.8%
9.3%
13.6%
19.9 (3.1)
22.5 (2.0)
15.8 (4.2)
22.4%
43.9%
18.8%
23.2%
22.3 (6.3)
20.5 (1.8)
13.1 (4.5)
25.7%
38.2%
27.9%
13.4%
27.3 (7.9)
23.3 (4.2)
–
21.1%
27.8%
15.2%
12.4%
6
Characteristics of the total population of athletes representing football, handball and endurance sports participating in the large screening study (part I). BMI, body mass
index.
*Self-reported; football significantly different from the other groups (p,0.05); `oral contraceptive users were excluded.
players compared to handball and endurance athletes reported
EDs (table 1).
Results from part III of the study (clinical interview) showed
that 32% of the athletes met the DSM-IV criteria for clinical
EDs.27 The prevalence of clinical EDs in ball game players has
previously been reported as being relatively low compared to
other sport groups.2 However, 24% of the football players, 29%
of the handball players and 44% of the endurance athletes met
the criteria in our study (fig 1). Based on practical experience
from the Norwegian Olympic Training Center, it was not
surprising that quite a high percentage of both handball and
football players met the DSM-IV criteria for BN and ED-NOS
(fig 1). In contrast to the expected findings, 7% of the handball
players participating in the clinical study (table 1 and fig 1) met
the criteria for AN (fig 1). This high prevalence among ball
game players might be explained by the increased focus on
body composition and leanness in ball sports.
Factors associated with the development of EDs
Psychological, biological and social factors are implicated in the
development of EDs.25 Because of the additional stress associated
with the athletic environment, female elite athletes competing in
leanness sports appear to be more vulnerable to EDs than the
general female population and athletes engaged in sports where
leanness is not as important.21 23 Risk factors include restrained
eating and training, frequent weight cycling, early sport-specific
training, personality factors, injury, a sudden increase in training
volume and the impact of coaching behaviour.3 12
Pressure to reduce weight has been the common explanation
for the increased prevalence of eating-related problems among
athletes. Data from the Norwegian screening study6 indicate
that pressure to reduce weight is not a typical problem in
Figure 1 The prevalence of AN, BN and ED-NOS among football players
(n = 17), handball players (n = 14), endurance athletes (n = 40) and control
subjects (n = 145).
football. However, the important factor may not be dieting per
se but rather the situation in which the athlete is told to lose
weight, the words used and whether the athlete receives
guidance or not. In addition to the pressure to reduce weight,
athletes are often pressed for time and have to lose weight
rapidly to make or stay on the team. As a result they often
experience frequent periods of restrictive dieting or weight
cycling.12 Weight cycling has been suggested to be an important
risk or trigger factor for the development of EDs in athletes.12 28
In football, the relationship between utilising muscle glycogen stores and the ability to maintain high intensity work,
especially in the second half of the match, is well known. The
warm environment requires a strategy for fluid as well as for
carbohydrate intake to minimise the negative effects of
dehydration on performance.29
Although there are individual differences between team
members depending on the player’s position and playing style, a
football player typically covers about 10–13 km during a match,29
including approximately 3 km in sprinting and high intensity
running, and the intermittent work makes great demands on the
anaerobic energy system. Thus, carbohydrate is the most
important substrate for energy production during a match.29
Low carbohydrate availability can lead to reduced skill and
judgment, causing the player to make more errors during the
game. Since low carbohydrate availability is detrimental to
performance, it is important to maximise glycogen storage
before and during the match and to optimise hydration status.
Football players typically restrict fluid consumption to the
breaks during the game and at half time. This can be a
challenge, especially in a hot environment. Thus, there is great
potential for players who have an individual drinking plan to
enhance their performance during both training and matches.29
Figure 2 Bone mineral density (BMD) in football (n = 17), handball
(n = 14) and endurance (n = 40) athletes and control subjects (n = 145)
participating in the clinical section of the study.
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i70
Health consequences
Undernutrition and EDs may cause serious medical problems
and can be fatal. Whereas most AN complications occur as a
direct or indirect result of starvation, BN complications result
from binge-eating and purging.21 The loss of fluids and
electrolytes during purging can lead to serious medical
problems such as dehydration, acid-base abnormalities, cardiac
rhythm disturbances and electrolyte abnormalities, and
decreased coordination, balance and muscle function. Such
behaviour is therefore dangerous to the health of athletes and
counterproductive to improving their performance.
Chronic low energy availability with or without DE can
impair health and physical performance.30 31 Medical complications involve the cardiovascular, endocrine, reproductive,
gastrointestinal, renal and central nervous systems.10 31 32
Psychological problems associated with EDs include low selfesteem, depression and anxiety disorders.10 31 32
Sundgot-Borgen, Torstveit
methodological limitations and their results should be carefully
evaluated.29 In a study testing two hypotheses concerning the
disruption of luteinsing hormone (LH), Loucks et al16 suggest that
LH pulsatility in women depends on energy availability and not
necessarily on the stress of exercise.
Health consequences
Most athletes refer to the absence of menses as a pleasant
convenience and are unaware that the skeleton could suffer
irreversible consequences. Although athletic amenorrhea is the
most extreme type of menstrual dysfunction, other forms can
result in suppressed oestrogen levels and can affect bone health
and fertility.35 The loss of BMD is a silent process, and the
athlete is usually unaware that a problem exists until a related
injury, such as a stress fracture, occurs.
Furthermore, studies report a higher incidence of injuries and
stress fractures among amenorrhoeic and oligomenorrhoeic as
compared to eumenorrhoeic athletes.9 39 40
MENSTRUAL DYSFUNCTION
Definitions
The monthly menstrual cycle is the result of a complex
interaction between the endocrine and reproductive systems.
External stimuli affect the system through hormonal signals to
the hypothalamus. The cessation of menses coincident with
physical training has long been recognised.5
Eumenorrhea describes a normal menstrual pattern of 10–13
menses per year.33 34 Menstrual dysfunction seen in athletes is
characterised by a significant decrease in reproductive hormones,
especially oestrogen, and disruption of the normal menstrual
cycle.35 In the Norwegian study mentioned above, primary
amenorrhea, secondary amenorrhea, oligomenorrhea and short
luteal phase were all defined as menstrual dysfunction.8
Prevalence
Exercise-induced or athletic menstrual dysfunction is common
in active women and can significantly affect health and sports
performance.35 It has been reported that menstrual dysfunction
occurs in 6–79% of women engaged in athletic activity.8 34–37
Prevalence depends on the definition of menstrual dysfunction,
the sport and the competitive level of the athletes investigated.34 35 In the questionnaire (part I) of the study on elite
Norwegian athletes (n = 669) referred to above, a similar
percentage of athletes (17%) and controls (15%) reported
current menstrual dysfunction.8 However, significant differences were found in specific sports groups (table 1).
Factors associated with menstrual dysfunction
A number of factors, such as energy balance, DE behaviours,
exercise intensity and training practices, bodyweight and body
composition, and physical and emotional stress, may contribute to
the development of athletic menstrual dysfunction. There also
appears to be a high degree of individual variation regarding the
susceptibility of the reproductive axis to exercise and diet-related
stresses.35 The percentage of football players reported to have
current menstrual dysfunction is low compared to other sports
(table 1) and could indicate that football players are less affected
by the well-known risk factors for menstrual dysfunction
compared to athletes engaged in other sports.
Nutritional factors
The energy-drain and exercise-intensity hypotheses suggest that
athletic amenorrhea or other reproductive hormone abnormalities
observed in female athletes may be partly due to periods of energy
deficiency, or a combination of high energy expenditure, low
energy intake and/or high psychological and physical stress.18 35 A
few published studies have also indicated that football players
have lower energy availability.38 However, these studies have
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LOW BONE, MINERAL DENSITY AND STRESS
FRACTURES
Definitions
Osteoporosis is a disease characterised by low bone mass and
microarchitectural deterioration of bone tissue leading to
enhanced bone fragility and increased risk of fracture.5
The American College of Sport Medicine (ACSM) recommends
that the term ‘‘low BMD’’ should be used for female athletes with
a history of hypo-oestrogenism, nutritional deficiencies, stress
fractures and/or other secondary clinical risk factors for fracture
who also have BMD z scores of between 21.0 and 22.0.22 41–43 For
female athletes with secondary clinical risk factors for fracture and
BMD z scores less than or equal to 22.0, ACSM recommends that
the term ‘‘osteoporosis’’ should be used to reflect their increased
risk of fragility fractures.41
Prevalence
The prevalence of osteopenia and osteoporosis among female
athletes is low, but a number of studies have reported a significant
decrease in vertebral BMD among young female athletes with
menstrual dysfunction.44–49 In the previously mentioned
Norwegian study,50 11% of athletes met the criteria for low bone
mass.50 Both football and handball players had high values at all
measurement sites when compared to endurance athletes and
controls (fig 2). This was expected due to the mechanical stresses
that football and handball players experience during training and
competition.
Thirteen percent of football players reported a history of
stress fracture.6 This is about the same percentage as reported
by endurance athletes. However, further investigation revealed
that only two of the 17 football players and one of the 14
handball players reporting stress fractures had actually been
clinically diagnosed with a stress fracture.51
The presence of bone loss at regional sites partly depends on
the extent of mechanical loading at those sites in various sports.
Not all amenorrhoeic athletes have low bone mass. Their
skeletal status depends upon the length and severity of their
menstrual dysfunction, as well as factors influencing their BMD
prior to the onset of amenorrhea.51 The results from our study
support findings regarding the prevalence of high BMD values
in ball game players.52
Factors associated with low bone mineral density
BMD is dependent on age, sex and race. In addition, heredity is
thought to explain 60–80% of the variation in BMD among
individuals.11 Peak bone mass is the maximum amount of bone
acquired at skeletal maturity, and those with a high peak bone
mass may be at lower risk of developing osteoporosis later in
The female football player
life.52 Modifiable factors that determine BMD are soft tissue
composition (lean mass, fat mass), lifestyle factors (smoking,
alcohol intake), medications, hormones, physical activity and
nutrition. These factors may interact with one another, and their
degree of influence varies depending on age and skeletal site.53
Both oestradiol and progesterone contribute to the maintenance
of bone density by affecting bone formation and remodelling.18 34 48 54 Therefore, any factor that contributes to menstrual
dysfunction can have a direct or indirect influence on bone density
and compromise bone health. Furthermore, it is well known that
weight-bearing activity slows or reverses bone loss, thus decreasing a woman’s risk of developing osteoporosis.55 The mechanical
loading related to football play is probably the main reason for the
high values found in this group (fig 2). In addition, the prevalence
of EDs and menstrual dysfunction is quite low and has probably
not yet affected the BMD of these players. In addition to exercise,
the most important of the modifiable factors are diet and energy
and nutrient intake.56
Nutritional factors
Insufficient nutritional intake has a detrimental effect on
vertebral bone density.57 58 DE and low calcium intake
combined with menstrual dysfunction may exacerbate bone
loss.5 Athletes with anorectic ED have been shown to have
decreased vertebral BMD.49 59
In general, most experts agree that a calcium-rich diet is
important to promote and sustain optimal bone density; if
necessary, calcium could be added as a supplement to the
female athlete’s diet. In addition, vitamin D plays an important
role in maintaining calcium homeostasis, while vitamin K
deficiency is associated with an increased risk of hip fracture in
adults.56 Other minerals important for bone health include
sodium, magnesium and zinc.56 Although there is limited
research on the dietary habits of female football players, the
available literature suggests that many female players need to
increase carbohydrate and fluid intake and improve dietary
habits to sustain the demands of training and competition.60
Health consequences
Reduced bone mass per se does not necessarily have an immediate
physical effect. However, elite athletes can experience bone loss
that leads to osteoporosis, increased risk of fractures, pain, a
reduction in training volume, frequent training breaks caused by
injuries and the end of an athletic career.
To date, no long-term study has shown that amenorrheic
individuals can fully regain lost BMD, despite returning to a
normal reproductive status.46 This risk is especially critical for
the adolescent or young adult athlete as peak bone mass is
reached by the third decade of life.46 However, further studies
are needed to determine the long-term effects of the resumption of menses on BMD.
HOW TO HELP ATHLETES WITH THE TRIAD
Players with one component of the triad should be screened for
the other components. This screening could be carried out at
the pre-participation examination and during evaluation of the
following: energy and nutrient intake, possible ED behaviour,
menstrual status and history, changes in weight, cardiac
arrhythmias including bradycardia, depression and stress
fractures.5 61
As few have discussed treatment for the triad, this section
mainly relies on the experience the authors have gained while
working at the Norwegian Olympic Training Center. An ED team
including a medical doctor, sports nutritionist, exercise scientist
specialising in EDs and a psychiatrist was established in 1998. The
treatment plan is based on a trusting relationship between the
athlete and the care providers. This includes respecting the
i71
athlete’s desire to be lean for optimal athletic performance and
expressing a willingness to help the athlete be lean and healthy.
According to Manore,35 the most common nutritional issues
in athletes with DE and/or menstrual dysfunction are poor
energy consumption and/or poor food selection, which can lead
to poor protein, carbohydrate and essential fatty acid intake.
The micronutrients most commonly found to be low are the
bone-building nutrients, especially calcium, the B vitamins,
iron and zinc. If energy drain is the primary contributing factor
to athletic menstrual dysfunction, better energy balance will
improve overall nutritional status and may reverse menstrual
dysfunction, thus returning the athlete to normal reproductive
status. Because bone health can be compromised in female
athletes with menstrual dysfunction, intakes of bone-building
nutrients, such as calcium and vitamin D, are especially
important. Iron and zinc are typically low in the diets of
female athletes if meat products are avoided. Adequate intake
of the B vitamins is also important to ensure adequate energy
production and the building and repair of muscle tissue.
In addition, it is important (i) to focus on normalising
weight, body composition and the menstrual cycle, (ii) to
modify unhealthy thought processes that maintain the disorder
and (iii) to deal with the emotional issues in the individual’s
life. The younger the athlete, the more the involvement of the
family is recommended.
If menstrual dysfunction is confirmed, the therapist should
inform the athlete about the detrimental effects of loss of
menses on skeletal integrity. Emphasis should be placed upon
both the short- and long-term consequences of decreased BMD.
If the athlete has experienced irregular menses for 6 months or
more, a bone density assessment using dual-energy x-ray
absorptiometry (DXA) should be carried out. A diagnosis of
osteopenia may persuade the athlete to change their behaviour
and training practices. Some studies report an increase in BMD
in amenorrheic athletes resuming normal menses, but these
gains seem to be limited.5 62 Amenorrheic athletes given
hormone replacement therapy in doses used for menopausal
women have shown maintenance of bone mass but no gains.5
Health professionals should question athletes with stress
fractures about their menstrual and eating histories. The presence
of other symptoms such as tiredness/exhaustion, inadequate or
poor nutrition, anaemia, electrolyte imbalance and depression
should also prompt evaluation of the three triad components.
In our opinion, suspension from both training and competition is not recommended. First, if the athlete is suspended, she
may train on her own, which in some cases may be more
dangerous because no one will be monitoring her exercise.
Second, preventing the athlete from participating in her sport
may further reduce her self-esteem. Third, control is a key issue
for the individual with an ED and she may view the total
suspension as an attempt by others to control her. However, if
the athlete is unable to increase her energy intake to an optimal
level, training volume must be reduced. At the Norwegian
Olympic Training Center we have established some minimal
criteria for athletes with EDs to continue training: (i) the
athlete must agree to comply with all treatment strategies as
best she can; (ii) the athlete must be closely monitored on an
ongoing basis by the health care professionals handling her
treatment; (iii) treatment must always take precedence over
training and competition; and (iv) if any question arises at any
time as to whether the athlete is meeting or is able to meet the
stated criteria, competition is not to be considered a viable
option while the athlete is in treatment.
CONCLUSIONS
As some female athletes and non-athletes do not consider
training or exercise to be sufficient to achieve their idealised
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i72
body shape or level of thinness, a significant number diet and
use harmful, though ineffective, weight-loss practices such as
restrictive eating, vomiting, laxatives and diuretics. Although
dieting, EDs and menstrual dysfunction are less common in
football than in many other sports, it is important to be aware
of the problem as EDs in female athletes can easily be missed.
DE may result in amenorrhea and loss of bone mass because of
energy deficit. If untreated, EDs can have long-lasting
physiological and psychological effects and can be fatal.
Treating athletes with EDs should be undertaken only by
qualified health care professionals.
Energy deficiency seems to be an important factor associated
with menstrual dysfunction in athletes. The amount of bone
loss seems to be correlated with the severity and length of
menstrual dysfunction, nutritional status and the amount of
skeletal loading during activity. Due to the severe consequences
of EDs, menstrual dysfunction and low BMD, it is important to
identify athletes at risk of the triad as early as possible.
.......................
Authors’ affiliations
Jorunn Sundgot-Borgen, Monica Klungland Torstveit, The Norwegian
School of Sport Sciences, Oslo, Norway
Competing interests: None declared.
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