Q: “I know that for joint health we need cortisol levels to be in the normal range, but with all the evidence of glucocorticoids like cortisol being catabolic, wouldn’t low normal be the best place to be?”
A: At least where androgen levels are midnormal or better, no results have ever indicated to me that muscle is built more readily with lower cortisol levels than with mid-normal or high-normal levels.
The activities of glucocorticoids (GC’s) such as cortisol and dexamethasone have I think been misunderstood, leading to incorrect theorizing and to some ineffective supplement products.
An excellent article providing information on this is “Synergistic stimulation of myogenesis by glucocorticoid and IGF-I signaling”
Briefly, in their cell study:
“IGF-I was used at 5 nM, which is sufficient to stimulate myogenic differentiation. Dexamethasone (Dex) was used at a relatively low dose of 10 μM compared with other studies.
“Combined, Dex and IGF-I enhanced morphological differentiation compared with IGF-I alone. Quantification of morphological differentiation using the myogenic index clearly showed Dex reduced myoblast fusion. In contrast, IGF-I increased fusion, which was further exceeded by the combination of IGF-I and Dex. This not only resulted in more, but also larger, myotubes.
“As a mere restoration of protein synthesis signaling by IGF-I did not explain the synergistic effects of IGF-I and GC on myotube formation and myosin expression, muscle-specific mRNA abundance during differentiation was assessed. After 48 h of differentiation, muscle-specific mRNA was quantified. MCK expression was increased by IGF-I (90%), but surprisingly also by Dex alone (70%). Combined IGF-I/Dex increased MCK expression more than threefold compared with either IGF-I or Dex alone, indicating a synergistic interaction.”
The authors also analyzed data from a previous human study with COPD patients where low-dose nandrolone decanoate and glucocorticoids were used. Their findings?
“Nandrolone decanoate (ND) administration in absence of GC did not result in significant gain of FFM or inspiratory muscle strength.
“Conversely, ND administration in the presence of GC did significantly improve gain in FFM as well as inspiratory muscle strength.”
So, the right GC level can actually aid muscle growth and strength, very substantially!
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Reducing cortisol, where not excessive in the first place, could actually be counterproductive. At best, I think that practical results show no benefit to reducing cortisol when levels are already normal.
My recommendation is to not worry about cortisol unless it is abnormally high.
About the author
Bill Roberts is an internationally-recognized expert on anabolic steroids and performance-enhancing drugs (PEDs). He received a bachelor degree in Microbiology and Cell Science and completed the educational and research requirements for a PhD in Medicinal Chemistry at a major American university.
Bill entered the nutritional supplement industry prior to completing his doctoral thesis but his education was invaluable so far as being able to design/improve nutritional supplement compounds, since it was in the field of designing drug molecules and secondarily some work in transdermal delivery.
His education was not specifically "geared" toward anabolic steroids other than expertise with pharmacological principles having broad applications. This has allowed Bill to provide unique insight into the field of anabolic pharmacology with knowledge of points which he would not have known otherwise.
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