"
Endocrine status: Peak bone mass may be jeopardised in
prolonged amenorrhoea (absence of menstruation).
Women athletes suffering from amenorrhoea are at especially high risk, more so if their diets are low in calcium. Although studies show that bone density in cortical bones tends to be normal among amenorrhoeic female athletes, these still remain the prime sites for stress fractures. Grimston and co-workers (1991) have shown that runners who began running training in close association with the age of menarche demonstrate a higher incidence of stress fractures than those commencing training at a later age. Heavy endurance training may also compromise androgen status in men, which may lead to lowered bone strength. At present, little is known about this relationship
Nutritional factors: Training, nutritional and hormonal factors tend to be closely interlinked with stress fractures (see Peak Performance no. 59, 1995, pp 4-7). Recommended calcium intake in post-puberty is 800mg/day, whereas stress-fracture patients are encouraged to consume 1500mg of calcium daily"
http://www.sportsinjurybulletin.com/...fractures.html
Poor Nutrition Can Lead to Stress Fractures
"Although men and women suffer from stress fractures, women may be at higher risk because of what is called the
"female athlete triad" -- disordered eating, menstrual dysfunction and osteoporosis.
Recent studies have shown that not replenishing energy consumed by exercise with adequate caloric intake may lead to the menstrual problems and poor bone health."
A typical scenario is a lean female athlete who is trying to be thinner because she thinks being thinner will increase her chances of running faster," Nattiv says. "She . . . runs to the point where she loses her period."
Some athletes also skip meals to drop weight, and because of
poor nutrition and hormonal changes they fail to make healthy bone."We know that estrogen is needed for bone health," says Nattiv, who also directs the Osteoporosis Center at UCLA.
Female athletes who lose their periods often have a very low estrogen level, which plays a role in decreased bone density and stress fractures.
Eric Peterson, coach for UCLA's distance runners, says such women are running on borrowed time."Once you get to an unhealthy state, an injury is going to develop," Peterson says. "It's one thing to break a bone in your foot due to a stress fracture, but it's an entirely different thing to break a bone in your sacrum or in your spinal column because of low bone density." At that point athletic performance takes a secondary role to concerns about long-term health, Peterson says."
http://cyclingnutrition.blogspot.com...to-stress.html
Stress fracture risk factors in female football players and their clinical implications
"A stress fracture represents the inability of the skeleton to withstand repetitive bouts of mechanical loading, which results in structural fatigue, and resultant signs and symptoms of localised pain and tenderness. (...) By considering risk factors for stress fractures in female football players it may be possible to reduce the impact of these troublesome injuries. Risk factors for stress fractures in female football players include intrinsic risk factors such as gender,
endocrine, nutritional, physical fitness and neuromusculoskeletal factors, as well as extrinsic risk factors such as training programme, equipment and environmental factors. This paper discusses these risk factors and their implications in terms of developing prevention and management strategies for stress fractures in female football players. "
http://bjsm.bmj.com/content/41/suppl_1/i38.abstract
Ebenso hier:
http://www.ajcn.org/content/51/5/779.short
und hier:
http://ajsm.highwire.org/content/29/3/304.abstract
sowie hier:
http://www.sciencedaily.com/releases...0913185558.htm
Soviel zum Thema, dass der Ansatzpunkt Ernährung in diesem Zusammenhang "unwichtiges Gefasel" sei... wenn man die Ursache-Wirkungsketten nicht kapiert, dann wirds einen immer wieder erwischen... .
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