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Reductions in circulating testosterone concentrations (due to enhanced cellular uptake) are monitored by the hypothalamus, which releases gonadotropin-releasing hormone (GnRH) to stimulate LH secretion, then testosterone synthesis/secretion (Kraemer et al., 2006). These differences may be important since the duration and magnitude of testosterone and AR elevation and AR exposure to testosterone appear to play a crucial role in skeletal muscle adaptations both in vitro (Bloomer et al., 2000) and in vivo (Antonio et al., 1999; Ferrando et al., 2002). However, the mechanisms of lactate action on testosterone production by Leydig cells are not clear yet. It seems high intensity RE stimulates basophilic cells of the anterior pituitary to release luteinizing hormone (LH) from gonadotrophs in the anterior pituitary which then acts as the primary regulator of testosterone secretion from the Leydig cells of the testes (Fry and Kraemer, 1997). SC, satellite cell; AR, androgen receptor; IRS, insulin receptor substrate; ARE, androgen response element. Homeostatic processes maintain systemic testosterone levels within the range of 7.7–29.4 nmol.L−1 in healthy young men and 0.1–1.7 nmol.L−1 in healthy menstruating women under 40 y (Handelsman et al., 2018). Given the apparent complexity of RE-induced hormonal responses and their impact on muscle adaptation, we aim to provide an update on advances in this area.
That said, the indirect effects are real and worth understanding. Six months in, the cumulative effects of sustained GH/IGF-1 elevation are measurable. If you've combined ipamorelin with consistent training and reasonable nutrition, this is where the "before and after" difference becomes clear enough to photograph. At 12 weeks, most users report visible body composition improvement — less fat, more lean tissue, better skin. Muscle fullness improving even without dramatic strength increases.
In this present study, significantly higher fT levels were observed in the wrestlers than in the analyzed non-athletes. However, with efforts lasting more than an hour, there is an increase and then a decrease in fT concentration over the next 3 hr to resting values. High-intensity efforts lasting less than 1 min do not change the concentration of fT, while efforts lasting an hour cause a significant increase in fT concentration.
Also, cortisol and IGF-1 are both involved in the inflammatory response and exist on opposite sides of the anabolic-catabolic balance at skeletal muscle tissue. Cortisol increased a significant amount by the end of the training camp which occurs due to increased physical and emotional stress. The combined effects of RE and RE-induced androgen release lead to upregulation of anabolic signaling pathways which likely augment net protein accretion and hypertrophy. If such a sequestration of IGF-1 into muscle increases during RE (with a decrease in cellular GH receptors), it might occur as a result of reduced GH-induced hepatic production (Eliakim et al., 1998) and it may be speculated that the effect would be more pronounced in individuals experiencing greater activation of intracellular muscle signaling and subsequent muscle hypertrophy and performance (Velloso, 2008; Arnarson et al., 2015; Morton et al., 2016). Increased expression of IGF-1 in muscle leads to muscle hypertrophy in mice; which is independent of effects of circulating levels of IGF-1 (Coleman et al., 1995). Thus, exercise counters negative feedback and so IGF-1 secretion is maintained or increased (Godfrey et al., 2003). The activation of Akt results in skeletal muscle growth/maintenance since it controls the phosphorylation of a number of substrates involved in MPS including mTOR (and its downstream targets 4E-binding protein 1 (4E-BP1) and p70S6 kinase) and glycogen synthase kinase 3β (GSK3β), as well as, the inhibition of protein degradation via the forkhead transcription factor (FOXO) pathway (Consitt et al., 2017).
Human growth hormone (GH) is secreted from somatotroph cells of the anterior pituitary. However, this has not been confirmed (Miller et al., 2006; Sakamaki-Sunaga et al., 2016) as no differences between follicular phase and luteal phase RET responses have also been observed, at least with regard to strength gains and hypertrophy; and as such, the role of estrogen in mediating responses to RE, remains unclear. When testosterone binds to the AR, the AR transforms, dimerizes and translocates to the nucleus, binding to androgen-response elements (ARE) therein, as a homodimer.
One directly affects the somatotropic cells of the anterior pituitary, itself inhibiting further release of GH, whilst the other affects GH releasing hormone and somatostatin release from the hypothalamus to reduce the secretion of GH. GH-induced IGF-1 released from the liver in response to RE is involved in two negative feedback loops. This implies that locally produced, autocrine/paracrine IGF-1 plays an important role in both pre- and postnatal growth. A liver-specific knockout mouse exhibited some postnatal growth reduction, but not as severe as with global IGF knockout (Baker et al., 1993; Tahimic et al., 2013). The exact mechanism of exercise-induced GH release remain ill-defined, however are likely driven via higher intensities of RE directly stimulating the anterior pituitary, facilitated via increasing circulating of catecholamines, lactate, nitric oxide and changes in acid-base balance (Godfrey et al., 2003).
Bikle et al. also showed muscle atrophy was more pronounced after ablation of muscle IGF-1 production than when hepatic IGF-1 production was suppressed (Bikle et al., 2015); exhibiting circulating levels of IGF-1 (i.e., endocrine factor) do not effect overall growth responses (Ohlsson et al., 2000; Velloso, 2008). Nevertheless, as these mice had a reduction in circulating IGF-1 and tissue IGF-1 expression; at least in part GH dependent, it is difficult to separate the effects of the two hormones (Velloso, 2008) and further investigations are needed to clarify the main effects of GH on muscle growth in adults, in particular after RE. The physiological relevance of increases in GH levels after RE may be increases in protein synthesis and its ability to aid in muscle repair (Gibney et al., 2007; Liu et al., 2008) and impact on muscle mass (Hermansen et al., 2017), without any impact on muscle function (Hermansen et al., 2017). It is reported that RE acutely augments the activity of the aromatase enzyme which results in an increase in the biosynthesis of estrogen from androgens (Nelson and Bulun, 2001; Luk et al., 2015); in turn explaining the effects of RE-induced testosterone increase on an increase in estrogen levels in women (Luk et al., 2015).
Training capacity increases because recovery is enhanced from multiple angles. Clients who commit to the MK-677 plus enclomiphene stack for 12 weeks with consistent training and nutrition typically report results that surprised them. The appetite increase from MK-677 is the one side effect that the stack does not inherently address. Enclomiphene alters estrogenic signaling in the brain, while MK-677’s GH elevation can cause fatigue in some individuals. The side effects of this stack are essentially the side effects of each compound individually, with one important interaction to monitor. The net result is elevated testosterone from enclomiphene combined with elevated IGF-1 from MK-677, giving you the best of both hormonal worlds without either compound undermining the other. Ipamorelin is administered subcutaneously — small insulin needles into the belly fat or outer thigh.
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