Energy balance
In female athletes engaged in sports emphasizing leanness, energy drain (energy expenditure exceeding dietary intake) is the primary causal factor for hypothalamic suppression of GnRH, leading to hypoestrogenism, menstrual dysfunction, and compromised bone density.
If you are a female athlete in a leanness-focused sport (like running or dance) and you have missed periods or lost bone density, the root cause is likely not just 'being thin' or 'training hard,' but a mismatch between how much energy you burn and how much you eat. Simply taking estrogen or birth control may not fix the underlying issue or restore bone growth. The most effective intervention is to increase caloric intake to match your energy expenditure, which may reverse menstrual dysfunction and stimulate bone accretion. Consult a specialist to screen for nutritional issues.
An energy drain incurred by women whose energy expenditure exceeds dietary energy intake appears to be the primary factor effecting GnRH suppression in athletes engaged in sports emphasizing leanness; nutritional restriction may be an important causal factor in the hypoestrogenism observed in these athletes.
Why this rating
The paper is a review citing multiple observational and experimental studies (e.g., Loucks 2000) showing exercise alone does not suppress LH, but exercise with caloric restriction does.
Source
The effects of intense exercise on the female reproductive system
M.P. Warren et al. · Journal of Endocrinology · 2001
DOI 10.1677/joe.0.1700003
More from this paper
- Hormone Replacement Therapy (HRT) or oral contraceptives in hypoestrogenic amenorrheic athletes may prevent further bone loss but are often insufficient to stimulate bone growth or replace bone lost prior to intervention; correcting metabolic abnormalities is more effective for bone health.Good
- In female athletes engaged in sports emphasizing strength over leanness (e.g., swimming, rowing), reproductive dysfunction is characterized by hyperandrogenism (elevated DHEA-S) rather than hypoestrogenism, potentially due to adrenal axis activation or self-selection of high androgens for performance.Moderate
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