Bioimpedance analysis is to a degree dependent on hydration and ideally conditions of measurement should be standardised so far as hydration is concerned; this was not possible in this study and the results should be interpreted with this knowledge. This was done at the time of data and blood sample collection post-event with a bioimpedance device of proven reliability and easy and fast to use in field studies such as this . Secondly, in order to explore further the profile of body composition and hormone milieu for a given sport, we have used binary logistic regression to determine which of the measured variables appear ‘characteristic’ of a given sport. Estimated lean body mass was surprisingly lower in weight-lifters who had a higher estimated fat mass. 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. These hormones are thought to have important effects on Learn all about the sex hormone here, including its primary benefits. However, men and hyperandrogenic women have higher amounts of abdominal fat than healthy women, and androgens have been found to increase abdominal fat in postmenopausal women and transgender men as well. In the Controlled Substances Act, AAS are defined to be any drug or hormonal substance chemically and pharmacologically related to testosterone (other than estrogens, progestins, and corticosteroids) that promote muscle growth. (Likewise, all "androgens" are inherently anabolic.) Indeed, it is likely impossible to fully dissociate anabolic effects from androgenic effects, as both types of effects are mediated by the same signaling receptor, the AR. Testosterone levels are highest in men around age 17 and drop as they age, starting between ages 30 and 40. There don't seem to be any benefits for women as far as energy, mood, or bone health. Testosterone does decline in women as they age, especially after menopause, but most of the time, TRT is not needed. Most of the testosterone is produced in the ovaries. This deceptively simple requirement for fairness is taken for granted by peer female competitors who regard participation by males, or athletes with physical features closely resembling males, as unfair. Sex classification in sports therefore requires proof of eligibility to compete in the protected (female) category. These features render the unassailable personal assertion of gender identity incapable of forming a fair, consistent sex classification in elite sports. For example, if gender were the basis for eligibility for female sports, an athlete could conceivably be eligible to compete at the same Olympics in both female and male events. Similarly, summarizing the nine available studies for healthy menstruating women under 40 years, the 95% (two-sided) reference range is 0 to 1.7 nmol/L. Based on a number-weighted pooling with conventional 95% two-sided confidence limits of the eight available studies using LC-MS measurements of serum testosterone, the reference range for healthy young men (18 to 40 years) is 7.7 nmol/L to 29.4 nmol/L. Hence, for the precision required in sports medicine, whether for eligibility criteria or antidoping applications, testosterone in serum must be measured by LC-MS methods. The necessary reliance on steroid mass spectrometry for clinical applications in endocrinology, reproductive medicine, and sports medicine is widely recognized. In males, this leads to enhanced pituitary LH secretion that stimulates the 500 million Leydig cells in the testes to secrete 3 to 10 mg (mean, 7 mg) of testosterone daily (4, 6, 7, 14, 15). These sports disproportionately attract athletes with greater weight and/or power-to-weight ratio or advantageous stature, respectively. Using Binary Logistic Regression the demographic data and endocrine profiles of a given sport was compared with that of the ‘control’ group created from all the other sports combined. On occasions where a given variable was known to be age-dependent (e.g. growth hormone, IGF-I and the collagen biomarkers), multiple regression analysis with sport and age as independent variables, was used to examine their relative contributions to the observed differences. Comparison between the sport with the lowest mean value of a given endocrine variable and the results from other sports was performed using Dunnett’s method (Minitab 17). Hence, at birth the external genitalia may appear feminine, leading to a female assigned natal sex. However, these latter pattern effects are subtle and the dominant effect remains that of dose and average testosterone concentrations in blood, however they arise. In creating a threshold for eligibility for female events it is also necessary to make allowance for women with polycystic ovary syndrome (PCOS) and nonclassical adrenal hyperplasia. This makes policing of eligibility inescapable for sports, to avoid unfair male participation in female events.
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