The Endocrinology of Strongman: Hormones That Influence Mass, Strength and Recovery - Episode 3: Estrogen in the Male Athlete

Episode 3: Estrogen in the Male Athlete

When people hear “estrogen,” the conversation in the weight room often goes in one direction: a female hormone that men should keep as low as possible. Real physiology is much more interesting. In men, estradiol is produced in smaller amounts than in women, but it has essential roles in bone, reproductive-axis regulation, sexual function, body composition, and other metabolic processes.

For the Strongman athlete, the central idea is simple: estrogen is not testosterone’s enemy. Estradiol is one of testosterone’s biological products and part of the same endocrine system we explored in previous episodes. Too little is not automatically better, and too much is not automatically better.

1. Estrogen exists in men too

The main biologically active estrogen in men is estradiol, or E2. In men, a large proportion of circulating estrogens comes from peripheral conversion of androgens through the enzyme aromatase, which is expressed in tissues such as adipose tissue, bone, and brain. The testes also contribute, but they are not the only source.

A man does not need ovaries to need estrogen. The male body produces and uses estrogen physiologically, and estrogen receptors are present in multiple male tissues.

2. Where does estradiol come from in men?

Aromatase converts certain androgens into estrogens. With testosterone, this conversion produces estradiol. It is a normal enzymatic reaction, not a biological error and not evidence that testosterone is being “wasted”.

The proportion produced in different tissues can vary, and adipose tissue matters because it expresses aromatase. Yet the relationship between fat, aromatase, and estradiol is more complex than the simple formula “more fat = bad estrogen.”

3. Estradiol and bone: probably the most important lesson for Strongman

One of the strongest arguments that estrogen has an essential role in men comes from bone health. Human models with aromatase deficiency or nonfunctional estrogen receptor alpha show low bone mass, increased bone turnover, and abnormal skeletal maturation.

In adults, estradiol helps limit bone resorption and maintain bone mass. In the literature on male skeletal health, estradiol concentration is often more closely associated with bone turnover and bone loss than testosterone alone.

4. For a Strongman, bone is not decoration

A Strongman athlete transfers enormous forces through the spine, pelvis, femur, tibia, shoulder girdle, and the structures connecting them. In this setting, skeletal health is part of the ability to keep competing for years.

Excessive aromatase blockade can therefore create a paradox: an athlete may try to make the endocrine system “drier” and instead create a less favorable environment for the skeleton.

5. Estradiol and muscle mass

The role of estradiol in male muscle mass is not as well defined as the role of androgens, but that does not make it irrelevant. Estrogen receptors exist in muscle, and estrogens can influence muscle metabolism and tissue responses to exercise.

The key is not to confuse “not the main anabolic hormone in men” with “has no function.” Endocrine systems rarely work through one switch.

6. Estradiol and sexual function

Estradiol contributes to male sexual function, and experiments that reduce both androgens and their conversion to estradiol show that estrogen is not merely an unimportant by-product. Libido and sexual function nevertheless depend on a broader neuroendocrine context.

An athlete with low libido cannot be diagnosed from estradiol alone, just as high libido does not prove an ideal hormone level.

7. Estradiol and feedback on the HPG axis

Estradiol participates in negative feedback to the hypothalamus and pituitary. When estrogenic and androgenic signaling is elevated, the body can reduce GnRH, LH, and FSH. Estradiol therefore participates in the mechanism through which the axis maintains balance.

This loop also explains why pharmacological interventions that alter aromatase can change estradiol, testosterone, and gonadal signaling at the same time.

8. What happens when estradiol is too low?

Estradiol that is too low can especially affect bone. Men with aromatase deficiency or estrogen resistance have shown problems with mineralization and bone density. Intervention studies with aromatase inhibitors support the same conclusion: reducing estrogen can increase bone turnover.

Symptoms involving sexual function or general well-being can also occur, but these are less specific than the skeletal effects. “As low estradiol as possible” is not a universal physiological target.

9. What happens when estradiol is too high?

Excess estradiol can be associated with gynecomastia, fluid retention, breast tenderness, and other symptoms, but interpretation depends on context. Values can vary, and symptoms are not always explained by one hormone.

A high estradiol value also does not automatically mean testosterone is being “over-aromatized.” There can be a combination of androgen production, aromatase activity, body composition, medications, and individual differences.

10. Why the testosterone-to-estradiol ratio is not a magic score

Fitness discussions often treat the testosterone-to-estradiol ratio as a universal measure of “hormonal balance.” In reality, calculated ratios do not replace individual values, symptoms, and clinical context.

Two people can have the same ratio and completely different absolute levels. In addition, laboratory methods for estradiol can differ in sensitivity and accuracy, especially at the low concentrations seen in men.

11. Why estradiol testing in men can be difficult

In men, estradiol circulates at lower concentrations than in reproductive-age women. Some immunoassays have limited precision in the low range, which is why more sensitive methods such as LC-MS/MS can be preferred in selected clinical settings.

In practice, the result should be interpreted together with the laboratory method and the clinical picture. An isolated number taken out of context can create more anxiety than information.

12. Estradiol and body fat

Adipose tissue expresses aromatase, helping explain the relationship between body composition and estrogen metabolism. But the relationship is not one-way and does not justify simplifying all body fat into “bad estrogen.”

For a Strongman athlete, where high body mass can be intentional for the demands of the sport, endocrine interpretation has to be made in the context of the whole physiology and competitive goals.

13. Estradiol and low energy availability

Insufficient energy availability can affect the HPG axis, and reduced reproductive signaling should not be viewed only through testosterone. During aggressive dieting, high training volume, and insufficient recovery, the entire endocrine environment can change.

For male athletes, this reinforces the same lesson from Episode 1: the body allocates resources according to context. Reproductive function and homeostasis are not independent of energy and stress.

14. What happens if you block aromatase too aggressively?

Aromatase inhibition reduces conversion of androgens into estrogens and can raise circulating testosterone, but that does not automatically create a better biological environment. In studies of men, estrogen blockade can reduce bone protection and alter some metabolic and sexual functions.

In other words, the problem is not that aromatase exists. The problem can be either excess or unjustified suppression of a physiological pathway.

15. Estradiol in the context of exogenous testosterone

When an exogenous androgen raises androgenic signaling substantially, some of it can be aromatized to estradiol. This can change symptoms and feedback on the HPG axis. But medical management of adverse effects does not mean every rise in estradiol should automatically be suppressed to zero.

Non-medical androgen use is a distinct endocrine problem and can affect fertility, lipids, hematocrit, blood pressure, and other systems. This episode explains physiology, not drug-use protocols.

16. Estradiol and male fertility

Estrogen participates in the regulation of male reproductive function. In addition, any intervention that suppresses the HPG axis can reduce LH and FSH and thereby affect spermatogenesis. The estrogen discussion therefore cannot be completely separated from fertility.

For an athlete who is planning to have children, this may be far more important than any cosmetic goal involving water retention or competition-day appearance.

17. Estradiol and the brain

Estrogen receptors are also expressed in the nervous system. Estradiol participates in several neuronal and regulatory processes, although many of its exact effects on male performance are less clearly defined than its effects on bone.

This matters for balanced interpretation: a hormone's “female” reputation says nothing about how biologically important it is in a male body.

18. Estradiol and metabolism

Endocrine literature supports roles for estradiol in body composition and glucose metabolism. The effects are context-dependent, however, and do not permit a simple formula such as “high estradiol = fat” or “low estradiol = better performance.”

In strength athletes, body composition results from energy intake, training, genetics, multiple hormones, and weight history. Estradiol is one variable in that network.

19. Estradiol and recovery

It is tempting to call estrogen the “recovery hormone,” but that is too broad. More accurately, estradiol contributes to homeostasis in several tissues, and imbalance can alter the environment in which recovery occurs.

Recovery after Strongman still depends on sleep, energy, load management, tissue healing, and stress regulation. No hormone replaces those elements.

20. What NOT to do with information about estrogen

Do not turn estradiol into an enemy. Do not chase the lowest possible value. And do not treat a laboratory result without context as a diagnosis.

Especially for athletes using or considering hormonal medications, decisions should be made with medical evaluation because manipulating estrogen can have consequences for bone and other systems.

21. What should be monitored in a male Strongman?

More important than “how low is the estrogen” is whether the athlete has a hormonal profile that fits the clinical state: symptoms, libido, reproductive function, skeletal health, body composition, energy, sleep, and performance.

If unexplained bone pain, stress fractures, major sexual changes, or other persistent symptoms appear, evaluation should focus on the cause and on the endocrine system as a whole, not estradiol alone.

22. Testosterone and estradiol are not rivals

Testosterone can be converted into estradiol, and both molecules contribute to male physiology. One of endocrinology's most important lessons is that the same molecule can serve as a precursor for another important biological signal.

From this perspective, aromatase is not a factory producing “problems,” but a normal component of steroid metabolism.

23. Why “zero estrogen” is a bad idea

In men, reducing estrogen to very low levels can carry a cost. The strongest evidence concerns bone, but there are also data involving sexuality and metabolism. Physiological estradiol should therefore be viewed as part of the balance, not as hormonal contamination.

In a sport where a career can depend on skeletal and tissue integrity, sacrificing bone health for a superficial hormonal goal is not a good strategy.

24. What should you remember from this episode?

Estrogen is present and necessary in men. Estradiol is produced largely through aromatization of androgens. It has an important role in bone, participates in reproductive and sexual function, and can influence metabolism and other tissues.

Too little is not automatically better. Too much is not automatically better. And the number alone does not always tell the story.

25. Conclusion

For the male Strongman athlete, estradiol should be understood as part of the androgen-estrogen system, not as testosterone's adversary. Testosterone produces androgenic effects and, through aromatase, contributes to estradiol production. Estradiol, in turn, supports skeletal integrity and participates in multiple endocrine and metabolic functions.

In endocrinology, balance does not mean pushing every hormone to a maximum or minimum. It means keeping the system functional. For a Strongman athlete, that is the difference between chasing a number and protecting the body that must lift heavy weights year after year.

Selected bibliography

1. Finkelstein JS, Lee H, Burnett-Bowie SA. Gonadal steroids and body composition, strength, and sexual function in men. New England Journal of Medicine. 2013;369:1011-1022.

2. Carlsen SM, et al. Estradiol as a male hormone. European Journal of Endocrinology. Review literature on estrogen physiology in men, aromatization, bone, reproduction and metabolism.

3. Vandenput L, Ohlsson C. Sex steroid metabolism in the regulation of bone health in men. Journal of Steroid Biochemistry and Molecular Biology. 2010;121:275-280. DOI: 10.1016/j.jsbmb.2010.03.067.

4. Leder BZ, et al. Differential effects of androgens and estrogens on bone and body composition in men. Clinical and experimental literature on aromatization and estrogen action.

5. Carani C, Qin K, Simoni M, et al. Effect of testosterone and estradiol in a man with aromatase deficiency. New England Journal of Medicine. 1997;337:91-95.

6. Sinnesael M, Claessens F, Boonen S, Vanderschueren D. Novel insights in the regulation and mechanism of androgen action on bone. Current Opinion in Endocrinology, Diabetes and Obesity. 2013.

7. 2026 review: Sex Hormones & Exercise in the Musculoskeletal System: From Signaling to Structure and Function. Endocrine Reviews. DOI: 10.1210/endrev/bnag018.