ergo-log.com

Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "

29.07.2020

Protein intake key factor in growth hormone's anabolic effect

Increasing protein intake may increase the anabolic impact of synthetic growth hormone. We formulate things cautiously, because the study on which we base this statement has been done with sick and malnourished people, not with fit athletes. Nevertheless, we would like to share the results of the research published in Nephrology, Dialysis, Transplantation in 2005 by American nephrologist Joel Kopple.

Study
The researchers, affiliated with the Harbor-UCLA Medical Center, injected 6 adult kidney patients with growth hormone every day for 21 days. During this period, and during the 14 days, the researchers measured how much protein the patients consumed and the amount of IGF-1 in their blood.

The liver manufactures most of the IGF-1 molecules in the blood. The liver produces more IGF-1 as the concentration of growth hormone in the blood is higher. The muscle building effects of growth hormone are mainly the work of IGF-1.

Here's how the body regulates growth hormone and IGF-1 release.

Results
The figure below shows that administration of growth hormone increased the concentration of IGF-1 in the blood in most study subjects, but that 2 patients did not respond to growth hormone. These were Pt 3 and Pt 4.

Best respondes were Pt 1, Pt 2 and Pt 5.

Below you can see how much nitrogen (say dietary protein) the subjects consumed daily and how much nitrogen the subjects could retain (say: whether they were in an anabolic or catabolic state). All patients were malnourished, which is typical of their illness.

1 gram of nitrogen is approximately equal to 6.25 grams of protein.

The figure suggests that protein intake is an important factor in the anabolic activity of growth hormone. The subjects who did not respond to growth hormone, Pt 3 and Pt 4, had the lowest protein intake. The subjects who responded best to growth hormone treatment, Pt 1, Pt 2 and Pt 5, had the highest protein intake.

Conclusion
The researchers do not claim, however, that kidney patients should 'use' growth hormone. There is no evidence that growth hormone treatment makes this group healthier or makes it live longer.

Source:
J Nutr 2020;150:1871-9.

More:
MSM, growth hormone and IGF-1 | Stronger bones, stronger muscles? 11.06.2020
Too little potassium in your diet, less IGF-1 in your muscles 14.12.2019
More fish fatty acids, more IGF-1 01.04.2009

Archives:
Growth Hormone
Protein

Handful of ornithine caps before strength training boosts growth hormone level Give a guy who weighs 80 kg a dose of 8 g L-ornithine HCl before a weight training session, and his growth hormone level will increase by a factor of three.	Growth hormone is for sprinters Sumitomo Chemical has developed a SARM that may not only counteract the breakdown of the muscles due to aging, but also the age-related deterioration of cognitive abilities.	Cinnamon boosts IGF-1, rejuvenates skin A cinnamon supplement can help against skin aging, conclude biochemists at Osaka Prefecture University in Japan from an in vitro study.