Instead, the patient was encouraged to maintain his usual training routine, which he had followed before starting TRT supplementation. Before the pre-TRT phase, the patient completed a graded maximal oxygen consumption (VO2max) test on a treadmill using a gas and flow-calibrated metabolic cart (Parvo Medics, TrueOne 2400). HR monitoring was conducted using a validated chest strap device capable of continuously measuring HR during exercise with one-second epochs . The primary goal was to maintain as much consistency as possible between the pre-TRT period and the TRT supplementation phases. The Polar H10 chest strap was linked to the wrist-worn watch to measure HR responses during exercise. A wrist-worn wearable watch (Polar Ignite 2, Kempele, Finland) was worn daily to quantify step counts, and a chest strap (Polar H10, Kempele, Finland) was worn for each exercise session. Measuring body composition via bioelectrical impedance required the patient to stand barefoot on the scale’s foot sensors while holding the hand sensors for three minutes. In contrast to testosterone, DHEA and DHEA sulfate have been found to act as high-affinity agonists of these receptors. Greatly differing amounts of testosterone prenatally, at puberty, and throughout life account for a share of biological differences between males and females. The areas of binding are called hormone response elements (HREs), and influence transcriptional activity of certain genes, producing the androgen effects. The relationship between sex steroids and SHBG in physiological and pathological conditions is complex, as various factors may influence the levels of plasma SHBG, affecting bioavailability of testosterone. Specific proteins include sex hormone-binding globulin (SHBG), which binds testosterone, dihydrotestosterone, estradiol, and other sex steroids. Lipophilic hormones (soluble in lipids but not in water), such as steroid hormones, including testosterone, are transported in water-based blood plasma through specific and non-specific proteins. Fairer offers from test subjects with higher testosterone in the original study increase the likeliness of the offer being accepted by the negotiating partner, therefore decreasing the probability of both participants leaving without any money. According to research, this hormone modulates muscle mass in both men and women. It is a therapy provided by a medical professional to increase your testosterone levels. With normalized testosterone levels, your body can handle more intense training, and you’ll recover more quickly and more fully. Thus the link between testosterone and aggression and violence is due to these being rewarded with social status. This could explain why some studies find a link between testosterone and pro-social behaviour, if pro-social behaviour is rewarded with social status. One study proposed that natural selection may have caused men to be more sensitive to situations in which their status is challenged, and that testosterone is the key factor that causes these situations to spark into aggression. Studies have found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression. The second theory is similar and known as "evolutionary neuroandrogenic (ENA) theory of male aggression". Results indicated a substantial increase in lean muscle mass and a reduction in body fat during the TRT phases. Healthy testosterone levels must be combined with a balanced diet and regular exercise to achieve muscle mass. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game. In accordance with sperm competition theory, testosterone levels are shown to increase as a response to previously neutral stimuli when conditioned to become sexual in male rats.