Strongman Physiology - Episode 6: Testosterone and the Male Physiology of Performance

1. Testosterone is not simply the “strength hormone”

In strength-sport culture, testosterone is often presented as a switch that turns strength, muscle mass and aggression on. Real physiology is more complex. Testosterone is a steroid hormone produced mainly by the testes in men and affects muscle, bone, blood, reproductive tissues and the nervous system, but Strongman performance emerges from the interaction of many systems: muscle, nervous system, energy availability, technique, connective tissue, cardiovascular, respiratory and endocrine function.

More importantly, higher serum testosterone does not automatically mean a better deadlift. Free and bioavailable fractions, androgen-receptor sensitivity, energy status, sleep, training and overall health all matter.

2. Where does testosterone come from?

Testosterone is synthesized mainly in Leydig cells in the testes under control of the hypothalamic-pituitary-gonadal axis. The hypothalamus releases pulsatile GnRH, the pituitary responds with LH and FSH, and LH stimulates Leydig cells to produce testosterone. Testosterone and its metabolites provide negative feedback to the hypothalamus and pituitary.

This axis behaves like a regulatory system rather than a pipe with a constant flow. Pulsatile secretion and circadian rhythms create meaningful variation over time, which is one reason a single blood test never tells the whole story.

3. Total testosterone, free testosterone and SHBG

Most testosterone in blood is bound to proteins, especially SHBG and albumin. Free testosterone represents a small fraction, while albumin-bound testosterone is relatively weakly bound and is often considered bioavailable.

Male endocrine physiology is best interpreted with total testosterone in the context of SHBG, albumin and the clinical picture. A seemingly normal total value can coexist with a different free fraction, and changes in SHBG related to body composition, nutrition, thyroid status or metabolism can alter the interpretation.

4. The androgen receptor: where the hormone becomes a signal

Many testosterone effects are mediated through the androgen receptor. After activation, the receptor can alter gene expression. In muscle, this signaling contributes to maintaining muscle mass and supporting adaptive responses to anabolic stimuli.

This is why hormone concentration is only part of the equation. Two people with similar testosterone concentrations may respond differently because receptor biology, intracellular signaling, training, nutrition and recovery all differ.

5. Testosterone and muscle mass

Testosterone has anabolic actions and supports processes that contribute to maintaining and increasing lean mass. In androgen deficiency, restoring testosterone toward a physiologic range can improve lean mass and aspects of physical function.

However, in healthy men, small physiologic fluctuations after training should not be confused with the pharmacologic effects of supraphysiologic androgen exposure. An acute post-exercise testosterone rise is not, by itself, a robust predictor of long-term muscle hypertrophy.

6. Testosterone and strength

Strongman strength depends on muscle mass, muscle architecture, intermuscular coordination, motor-unit recruitment, technique, experience and the ability to produce force under fatigue. Testosterone can support several of these processes, but it cannot be reduced to a simple “more testosterone equals more strength” equation.

Performance may decline in an athlete with a disrupted endocrine profile even when the training program is excellent. But the same decline can have more common explanations: poor sleep, inadequate energy intake, illness, psychological stress, accumulated fatigue or changes in training volume.

7. What happens after a hard training session?

Resistance exercise produces acute endocrine changes. Depending on intensity, volume, muscle mass involved and training status, testosterone may rise transiently, remain relatively stable or change in other directions. These responses are short-lived and should not be confused with chronic changes in endocrine status.

A workout that produces an acute testosterone increase does not simply “load” the muscle with hormone for the following days. Adaptation is the result of repeated mechanical stimuli, recovery and tissue remodeling over time.

8. The HPG axis and the energy cost of being a Strongman

The body prioritizes essential functions when available energy is too low. In male athletes, low energy availability and prolonged energy deficiency can disrupt the hypothalamic-pituitary-gonadal axis and reduce testosterone.

For a Strongman, this can paradoxically happen during a period of very high workload: repeated hard sessions, high energy expenditure, aggressive cutting, stress and inadequate sleep. In that setting, low testosterone may be a marker of a broader physiological problem rather than the isolated cause of every symptom.

9. Sleep and testosterone

Testosterone secretion is closely linked to sleep and circadian timing. Sleep restriction and fragmented sleep can alter the hormonal profile, while adequate sleep supports endocrine function and overall recovery.

For a strength athlete, sleep is not merely time between training sessions. It is part of the physiological environment in which adaptation occurs. Several nights of poor sleep can affect perceived effort, recovery and endocrine function before any laboratory value is checked.

10. Cortisol, stress and testosterone

Testosterone and cortisol are not rival fluids fighting for space in one hormonal tank. They belong to different systems coordinated around stress and physiological needs. Acute stress can temporarily alter endocrine responses, while chronic stress, low energy availability and inadequate sleep can impair gonadal function.

During competition weeks, an athlete may simultaneously experience elevated catecholamines, changes in cortisol and shifts in testosterone, depending on the context. Interpreting one hormone value as proof of “overtraining” is an oversimplification.

11. Erythropoiesis: testosterone and blood

An important and sometimes overlooked testosterone effect is stimulation of erythropoiesis. Androgens can increase erythropoietin signaling and red-cell mass, contributing to physiologic differences in hemoglobin and hematocrit between men and women.

This is relevant to oxygen transport, but it is not the main explanation for Strongman performance. Excessive hematocrit elevation also has clinical implications, which is why hormonal interventions must be treated as medical issues rather than simple performance strategies.

12. Testosterone and bone health

Androgens contribute to bone maintenance both directly and through conversion of some testosterone to estradiol. Strongman athletes place very high mechanical loads on the skeleton, and bone health depends on the combination of loading, nutrition, hormones and recovery.

Male performance physiology therefore means more than large muscles. The endocrine system also helps maintain the structural framework that must tolerate those forces.

13. Libido, mood and nervous-system function

Testosterone has important roles in sexual function and influences aspects of mood and cognitive function. However, symptoms such as fatigue, lower libido, irritability or reduced motivation are nonspecific and can occur for many reasons.

A Strongman who feels exhausted after weeks of high volume should not automatically assume low testosterone. Performance physiology requires consideration of sleep, energy intake, mental health, medications and overall medical status.

14. Circadian rhythm: testosterone is not constant all day

In younger men, testosterone is generally higher in the morning and declines during the day, although the amplitude of this variation can change with age, sleep and health.

That is why testing for possible androgen deficiency is usually standardized. A result collected after a poor night of sleep or at a very different time of day should not be mechanically compared with another sample.

15. Can testosterone explain everything in strength sports?

No. Genetics, muscle cross-sectional area, muscle architecture, leverages, technique, experience and neural capacity are major determinants. Strongman also adds grip strength, tolerance of awkward positions, complex kinetic-chain force production and fatigue management across events.

Testosterone is one important piece of male performance physiology, not the whole puzzle.

16. Why an acute post-training rise is not an anabolic “hack”

A persistent myth suggests that a workout producing a large rapid testosterone increase is automatically superior for hypertrophy. Research indicates that the relationship between acute hormonal responses and long-term muscle adaptation is much weaker than this model implies.

For Strongman, this means there is little reason to chase rituals simply to “boost testosterone.” More important are effective mechanical loading, progression, recoverable volume, adequate protein and energy, sleep and consistency.

17. Androgen deficiency: when physiology becomes a medical problem

Male hypogonadism is a medical condition that requires symptoms to be correlated with repeatedly confirmed low testosterone and an assessment of the underlying cause. It should not be diagnosed from a single laboratory value or one isolated symptom.

Causes can include testicular disorders, hypothalamic or pituitary disease, obesity, certain medications, chronic illness, severe energy deficiency and other factors. In athletes, assessment should be performed by a clinician who understands both endocrinology and training context.

18. Exogenous testosterone, TRT and anabolic steroids

Testosterone administered from outside the body is not equivalent to physiologic testosterone. Hormone-replacement therapy has medical indications and aims to correct documented deficiency. Supraphysiologic anabolic-androgenic steroid exposure substantially changes physiology and may suppress endogenous testosterone production.

In sport, these interventions can increase muscle mass and performance, but they also carry potential cardiovascular, hematologic, reproductive, hepatic and psychiatric risks depending on compound and exposure. They should not be framed as the equivalent of a nutritional optimization strategy.

19. What happens to the HPG axis with high exogenous androgen exposure?

Through negative feedback, exogenous androgens can reduce GnRH, LH and FSH secretion. As a result, intratesticular testosterone production can fall substantially, with effects on spermatogenesis and testicular function.

This is one reason testosterone discussions in Strongman should clearly separate normal male physiology from androgen doping.

20. Testosterone and aggressive dieting

Large calorie restriction, especially when combined with high training volume, can alter endocrine signaling. In Strongman, a weight-loss phase should protect energy availability, lean mass, sleep and recovery as much as practical.

A testosterone decrease during a very aggressive diet should not automatically trigger a search for “test boosters.” Often the root problem is energy deficiency or excessive physiological stress.

21. Alcohol, obesity and metabolic health

Metabolism and endocrine function are tightly linked. Obesity, insulin resistance, obstructive sleep apnea and excessive alcohol consumption can be associated with a poorer androgen profile. Conversely, improving sleep, metabolic health and body composition can favorably change the hormonal environment.

This shifts the testosterone conversation away from “which supplement do I take?” toward the more important question: “what does my overall health look like?”

22. How should hormone tests be interpreted?

A sound evaluation starts with symptoms and medical history, followed by standardized testing. When male hypogonadism is suspected, clinical guidelines generally recommend confirming low morning testosterone with a repeat measurement and, depending on context, additional evaluation such as LH, FSH, prolactin and assessment of SHBG or free testosterone.

Results should be interpreted against the laboratory reference range and in the context of age, medication, acute illness, sleep and training. Hormone values alone should not be used to define a Strongman athlete’s “condition.”

23. What can a Strongman do for endocrine health?

The strongest interventions are surprisingly unglamorous: adequate energy intake, sufficient protein, balanced dietary fat, regular sleep, stress management, treatment of excess adiposity when appropriate, limited alcohol intake and a training program that permits recovery.

There is no “test booster” that can consistently replace basic physiology. Supplements may have limited roles in specific circumstances, but they cannot compensate indefinitely for chronic calorie restriction, persistent sleep deprivation or an underlying medical condition.

24. Which signals deserve investigation?

A persistent combination of reduced libido, erectile dysfunction, low energy, loss of muscle mass, poor recovery and declining performance can justify medical evaluation. These findings remain nonspecific and do not automatically indicate androgen deficiency.

Especially after prolonged loading or dieting, it is useful to evaluate the whole system: energy, sleep, stress, metabolic health, endocrine status and training structure.

25. Conclusion: testosterone supports performance, but does not explain it alone

Testosterone is one of the major regulators of male physiology. It influences muscle, bone, blood, sexual function and adaptation to exercise. For Strongman, its real significance becomes visible only within a larger network of factors: nervous system, muscle, energy availability, sleep, stress, training and overall health.

A champion is not built by one hormone. A healthy endocrine environment creates conditions for performance, while performance itself emerges from the interaction of the systems that allow the body to produce, repeat and recover force.

Selected bibliography

1. Bhasin S, Brito JP, Cunningham GR, et al. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology & Metabolism. 2018;103(5):1715-1744.

2. Travison TG, Vesper HW, Orwoll E, et al. Harmonized Reference Ranges for Circulating Testosterone Levels in Men of Four Cohort Studies in the United States and Europe. Journal of Clinical Endocrinology & Metabolism. 2017;102(4):1161-1173.

3. Nieschlag E, Behre HM, Bouchard P, et al. Testosterone: Action, Deficiency, Substitution. Cambridge University Press.

4. Kraemer WJ, Ratamess NA. Hormonal responses and adaptations to resistance exercise and training. Sports Medicine. 2005;35(4):339-361.

5. Hackney AC. Exercise and the stress response: implications for athletes. Literature from exercise physiology and sports endocrinology.

6. Leproult R, Van Cauter E. Effect of 1 week of sleep restriction on testosterone levels in young healthy men. JAMA. 2011;305(21):2173-2174.

7. Corona G, Rastrelli G, Di Pasquale G, et al. Endogenous testosterone and cardiovascular, metabolic and sexual outcomes in men. Review and meta-analytic evidence.

Editorial note: this article is educational and does not replace medical evaluation. Diagnosis of hypogonadism, indications for testosterone therapy and assessment of adverse effects from androgen use require clinical assessment and context-specific interpretation of laboratory findings.