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The most notable feature is the low free T3 in male powerlifters and weightlifters and track and field athletes while free T4 was low in male canoeists. Figure 6 provides the thyroid function test results between sports in men and women. The ‘stress hormones’ cortisol, growth hormone and prolactin were all high in both men and women from track and field.
Muscle contraction and elevated testosterone may synergistically increase AR content, enhancing tissue anabolism; however, the relationship between these 2 variables is complex. Previously, the genetic composition of the AR gene (ie, number of CAG triplets in the gene) was shown to affect personal sensitivity to testosterone, with a smaller number of triplets connected to higher sensitivity to testosterone. We emphasized testosterone-related factors but acknowledged the influence of other anabolic components. Our research highlights considerations for implementing testosterone-optimizing approaches. Analgesic use, including nonsteroidal anti-inflammatory drugs (NSAIDs), opioids, and acetaminophen, is widely prevalent among athletes. A low (8 h/day) and middle (16 h/day) exposure to a 900-MHz mobile phone for 30 days in mice did not affect the testosterone synthesis function of the testes, but high (24 h/day) exposure showed a reduction in testosterone level.213 A decrease in testosterone was also observed after exposure to a 2.45-GHz Wi-Fi device for 2 hours per day in rats.103
Lee and Lee108 studied testosterone levels in male Korean police officers, suggesting links to daylight and weather. Opioid use is prevalent in sports, even at the high school level,47 with some studies showing misuse among athletes at 7%,159 making the effects of opioid important to review. Interestingly, another study of women with hyperandrogenism showed a testosterone decrease attributed to a direct inhibitory effect of ibuprofen on ovarian steroidogenesis.9 One study on humans suggested ibuprofen may suppress testicular endocrine cell activity, potentially causing hypogonadism.100 Another in vitro study reported that aspirin and indomethacin caused endocrine disruption at the level of the testes.1 Another study showed that men with NSAID prescriptions had lower testosterone levels compared with their counterparts without NSAIDs.58 In contrast, Halpern et al74 did not establish a relationship between regular NSAID use and testosterone levels. Radiofrequency electromagnetic radiation (RF-EMR) is abundant in modern environments, with mobile phones and Wi-Fi devices being the most common sources of RF-EMR.118 Most animal studies have shown a significant decrease in testosterone levels from mobile phones and Wi-Fi devices.7,60,96,103,128,141,142,167,168,171,207 It appears to be a dose-dependent effect. While it appears that sauna use does not change testosterone levels, the effects of sauna bathing on testosterone-cortisol ratio need to be further studied.
A synthetic testosterone for women is only licensed in Australia. Testosterone replacement therapy (TRT) is a shot, patch, or gel of the hormone testosterone to bring the level back to normal. Only men with symptoms of low testosterone and blood levels that confirm this as the cause of symptoms should consider testosterone replacement.
Ongoing advances in androgen detection will be offset by those athletes with better research, better access, and better monitoring to avoid an "adverse analytical finding". For much of the 20th century, a detailed understanding of testosterone dynamics lagged behind the empirical application of testosterone by athletes in competition. Indeed, transsexual athletes are now allowed to compete in the Olympics in their adopted gender, providing they have undergone gonadectomy with appropriate hormonal replacement for at least 2 years (Reeser, 2005).
Some studies have even found mixed or opposing results within their own findings. It seems to follow logically, then, that testosterone would boost your athletic ability generally. It’s also a driver of red blood cell count, and the more red blood cells you have the more oxygen you can carry to your muscles, increasing your aerobic capacity. Men have it in far higher quantities than do most women, and conventional thinking has long held that this is the primary reason that men tend to outperform women athletically. Adding extra testosterone, called exogenous testosterone, is essentially just doping.
In healthy younger men whose endogenous testosterone was fully suppressed, sexual function completely recovered when circulating testosterone was restored to the physiological male range by administration of exogenous testosterone (67). These effects can be replicated by exogenous testosterone if and only if it achieves comparable circulating testosterone concentrations. Furthermore, there is evidence that the androgen sensitivity of responsive tissues differs and may be optimal at different circulating testosterone concentrations (65). For example, in women of any age circulating testosterone concentrations are along the lower plateau of the dose-response curve, so that increases in circulating testosterone concentrations within that lower plateau may have minimal or no effect. At equivalent doses and circulating levels, exogenous testosterone exerts the same biological and clinical effects on every known androgen-responsive tissue or organ as endogenous testosterone, apart from effects on spermatogenesis, which as discussed below is only a matter of degree. Only when circulating testosterone concentrations rise in male adolescents above the prepubertal concentrations does the virilization characteristic of men commence, progress, and endure throughout adult life, at least until old age (18). After birth and until puberty commences, circulating testosterone concentrations are essentially the same in boys and girls, other than briefly in the neonatal period of boys when higher levels prevail.
The IAAF rules excluded athletes from competing in the specified events, unless they reduced their testosterone below 5 nmol/L, a lower level of testosterone than previously, suggested to be a more realistic limit for testosterone for women without DSDs. The authors noted that there is "complete overlap of the range of concentrations seen between the genders. This shows that the recent decision of the IOC and IAAF to limit participation in elite events to women with a 'normal' serum testosterone is unsustainable." It's best to measure free testosterone levels in the morning.
Basketball players and swimmers had lower levels of ICTP while P-III-NP was higher basketball and handball players. ALS was higher in swimmers while it was lower in alpine skiers and track and field athletes. Again BMI showed no discriminating tendency, neither did testosterone, LH, FSH, cortisol, fT3, IGFBP-2 or IGF-I. Basketball players, swimmers and cross-country skiers were characteristically younger than other sports while as with men, cross-country skiers were lighter than other sports. Fat mass was lower in rowers but relatively high in power-lifters and ice-hockey players.
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