Consistent with this, different populations of muscle cells may express different phenotypes of androgen sensitivity, raising the possibility that the muscle response to training may be different between men and women at the same testosterone concentrations. The hypothesis is that the low testosterone concentrations induced in transwomen or DSD women will impact negatively on muscle performance and recovery. Assuming these findings are replicated and if extrapolated to elite DSD women athletes and transwomen athletes, they would imply that decreasing bioavailable testosterone concentrations would mitigate to some extent any previous sporting advantage due to the previously high testosterone concentrations. At this time, it is the only method based on an objective biomarker supported by most available scientific literature (Table 1), while also accomplishing the integration of DSD women athletes and transwomen athletes into the female category of sports. Despite being imperfect, serum testosterone concentrations are being considered as the primary biomarker to regulate the inclusion of athletes into the female category. World Rugby became the first international sports governing body to ban the participation of transwomen in the elite female level of sport in October 2020. Most sports governing bodies adopted this policy, declaring the eligibility of transwomen athletes with serum testosterone concentrations 55, World Rowing and Union Cycliste Internationale (UCI) have all adopted the lower serum testosterone concentration limit of 5 nmol/L for transwomen athletes.|AAS such as testosterone also increase the risk of cardiovascular disease or coronary artery disease. Most of these side-effects are dose-dependent, the most common being elevated blood pressure, especially in those with pre-existing hypertension. The traditional routes of administration do not have differential effects on the efficacy of the drug. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream. Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.|If your levels are low because of aging, you don't need TRT. Many clinics and doctors offer testosterone replacement therapy, but you may not need it. If you do want to discontinue taking testosterone, don't stop cold turkey. The researchers noted that the people is the second group had been on TRT longer than the people in the first group (10.7 months vs. 5) and they also exercised regularly. The researchers found that for 92 patients (61%), the effects of TRT did not continue, but they did for the other 59 patients (39%). You can stop, but the symptoms of low testosterone will probably return.|On a somewhat longer time-scale, testosterone concentrations exhibit circannual variation and peak in the fall (Dabbs, 1990b; Stanton et al., 2011; van Anders et al, 2006). Secondly, in both sexes, testosterone follows a diurnal rhythm with peak concentrations in the morning followed by progressive decline over the course of the day, rising again at night during sleep (Dabbs, 1990a). This introduces a level of unpredictability for estimating circulating androgen concentrations in any single biologic sample. On the shortest time-scale, testosterone production in the gonads follows the pulsatile release of luteinizing hormone.}
An unusually informative observational study of women with CAH provides unique insight into testosterone effects on circulating hemoglobin in otherwise healthy women (92). It is well known that levels of circulating hemoglobin are androgen-dependent and consequently higher in men than in women by 12% on average; however, the physiological mechanism by which androgens such as testosterone boosts circulating hemoglobin is not fully understood (121). Data corroborating the Huang et al. study results comes from another well-controlled study in which postmenopausal women who were administered methyl testosterone following a run-in period of estrogen replacement displayed a significant increase in lean (muscle) mass as well as upper and lower limb power during a 16-week double-blind, parallel group study (113). Studies of the ergogenic effects of supraphysiological concentrations of circulating testosterone require studies administering graded doses of exogenous testosterone for months. Strong dose-response relationship between testosterone dose and circulating concentration with muscle mass and strength in men. An important difference between androgen effects on bone compared with effects on muscle or hemoglobin is that developmental bone effects of androgens are likely to be irreversible.Men have distinctively greater bone size, strength, and density than do women of the same age. Testosterone treatment in 17 (F2M) transmen that created mean circulating testosterone levels of 31 nmol/L also increased hemoglobin levels by 15% (114).
Severe energy imbalance in REDs can lower testosterone levels and affect performance, recovery, and health, while even subtle imbalances may impair performance.67 While focused initially on female athletes, REDs was later recognized to also affect male athletes, highlighting that the physiologic consequences of LEA are not sex-specific.105 Testosterone also influences competition, with precompetition testosterone spikes enhancing motivation and physical readiness.18,94,180,199 Winning increases testosterone levels, reinforcing positive behaviors, motivation, and reactivity—critical traits for athletes.6,202 Moderate-to-high intensity free-weight resistance exercises are most effective for increasing testosterone, while the effects of sexual activity remain unclear. Maintaining healthy testosterone levels requires energy balance and optimal nutrition with adequate macronutrients and micronutrients, especially for athletes prone to dieting and food restriction.
Elite sports organizations, from the NFL to Olympic committees, routinely monitor hormone levels, especially testosterone. There’s also differences in results depending on what type of strength you look at—endurance strength seems to decrease with higher testosterone levels, while maximum strength generally only increases. Yet another, comparing cyclists, weightlifters, and controls to each other on a cycling test, found a negative correlation between testosterone levels and performance. "If you start to look at men who are competing across a professional level, you can’t predict their performance based on their testosterone levels," says Richard Holt, a professor of endocrinology at the University of Southampton.
Accordingly, the distinction of male or female sex applies to all animals, but only humans can be said to have gender. DSD is often confused with "intersex", referring to conditions where the external genitalia do not conform to the standards of either male or female (Ritchie et al, 2008). This is consistent with current policy for athletes with DSD, which allows participation by women with "conditions that may accord some advantages", including congenital adrenal hyperplasia, androgen-secreting tumors, and polycystic ovarian syndrome (IAAF, 2006). Mandatory testing of all female athletes has been eliminated from Olympic competition.
For instance, studies indicate that heavy resistance exercises, like weightlifting, increase hormone production more than endurance activities. Intense exercise, such as strength training and high-intensity interval training (HIIT), often leads to acute spikes in testosterone. As the field of sports pharmacology continues to evolve, it is essential to consider the complexities of regulating testosterone in sports and to prioritize the health and fairness of all athletes. "More research is needed to better understand the effects of testosterone on athletic performance and to develop more effective and fair testing methods." However, the detection of testosterone use in athletes has been challenging due to its short half-life and the ability to manipulate its levels through various methods, such as microdosing and masking agents.
Testosterone replacement therapy side effects Congestive heart failure.Men with severe congestive heart failure should generally not take testosterone replacement, as it can worsen the condition. A sleep study (polysomnography) may be needed to make the diagnosis. This condition can be worsened by testosterone replacement. Men with prostate cancer or elevated prostate-specific antigen (PSA) should probably avoid testosterone treatment. Most experts recommend screening for prostate cancer before starting testosterone replacement. This condition, benign prostatic hypertrophy, can be made worse by testosterone therapy.

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