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When comparing men and women in the 30-, 50-, and 70-year age groups, young and middle aged men showed increased testosterone after exercise, with the latter also having increased cortisol. Elderly men showed no change. [25] Other studies have also shown with age there is a downtrend of testosterone [26] and attenuated growth hormone response. [27]
In the case of women, mean circulating DHT levels have been found to be about 9 ng/dL (0.3 nmol/L) in premenopausal women and 3 ng/dL (0.1 nmol/L) in postmenopausal women. [5] There was no variation in DHT levels across the menstrual cycle in premenopausal women, which is in contrast to testosterone (which shows a peak at mid-cycle). [5]
Androgens increase in both males and females during puberty. [3] The major androgen in males is testosterone. [4] Dihydrotestosterone (DHT) and androstenedione are of equal importance in male development. [4] DHT in utero causes differentiation of the penis, scrotum and prostate.
The anabolic effects are important in both males and females, although females have lower circulating levels of androgens. The physiologically most important androgens are testosterone (T) and dihydrotestosterone (DHT), which are considered classical androgens because their role in human health was discovered in 1930s. [ 1 ]
Administration of high-dose testosterone in men over a course of weeks can cause an increase in aggression and hypomanic symptoms, though these were seen in only a minority of subjects. [15] Acute high-dose anabolic-androgenic steroid administration in males attenuates endogenous sex hormone production and affects the thyroid hormone axis .
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As puberty begins and sex hormone levels rise, differences appear, though some changes are similar in males and females. Male levels of testosterone directly induce the growth of the genitals, and indirectly (via dihydrotestosterone (DHT)) the prostate. Estradiol and other hormones cause breasts to develop in females.
As men enter middle age they may notice changes caused by a relative decline in testosterone: fewer erections, fatigue, thinning skin, declining muscle mass and strength, and/or more body fat. Dissatisfaction with these changes causes some middle age men to seek ART.
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