Good read on Protein intake before training

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1: Med Sci Sports Exerc. 2005 Nov;37(11):1990-7.Click here to read Links
Protein ingestion prior to strength exercise affects blood hormones and metabolism.

* Hulmi JJ,
* Volek JS,
* Selanne H,
* Mero AA.

Department of Biology of Physical Activity, University of Jyvaskyla, Finland.

PURPOSE: The effects of protein consumption before strength training session on blood hormones, energy metabolites, RER, and excess postexercise oxygen consumption (EPOC) were examined. METHODS: Ten resistance-trained young men consumed either a 25 g of whey and caseinate proteins (PROT) or a noncaloric placebo (P) in a liquid form 30 min before a heavy strength training session (STS) in a crossover design separated by at least 7 d. STS lasted 50 min and included 5 x 1 RM squats, 3 x 10 RM squats and 4 x 10 RM leg presses with 2-, 3-, and 2-min recoveries, respectively. A protein-carbohydrate supplement was consumed after STS in both trials. Venous blood samples were collected before, during, and after STS and oxygen consumption before and after STS. RESULTS: Serum growth hormone (GH), testosterone, and free fatty acids (FFA) were significantly (P &lt; or = 0.05) higher in P compared with PROT 5 min after an STS. The calculated area under curve (AUC) of the serum insulin response during an STS was significantly (P &lt; 0.001) higher in PROT compared with P. The EPOC value from 90 to 120 min after an STS was significantly greater in the PROT condition compared with P (P = 0.01), and PROT treatment had a significantly higher RER 2 h postexercise (P = 0.04). The AUC of serum FFA during STS correlated significantly and negatively with RER 10-30 min after STS (r = -0.53, P = 0.02). CONCLUSIONS: Consuming 25 g of whey and caseinate proteins 30 min before an STS significantly decreases serum GH, testosterone, and FFA levels, and increases serum insulin during an STS. Furthermore, the pre-STS protein increased EPOC and RER significantly during 2-h recovery after STS.
 
I don't care. Even if that is the conclusion, I'd rather my muscles be saturated with needed protein and glycogen than just a slightly higher level of test and GH.

Test isn't going to do you any good without protein.
laugh.gif
 
If I was a betting man, I'd bet that this result is due to taking protein without carbs causes your body to produce catabolic hormones like cortisol and glucagon, in order to break down the protein into glucose to use as fuel. Cortisol suppresses Test and glucagon suppresses insulin, so that would explain the result. So taking protein with carbs would solve that problem, increasing insulin, not lowing T, and bathing the muscle in protein.

I'd hate to think that I'm smarter than these scientists though if they didn't think of that... any details on the % of protein and carbs in the pre-workout sups they took?
 
<div></div><div id="QUOTEHEAD">QUOTE</div><div id="QUOTE">I'd bet that this result is due to taking protein without carbs causes your body to produce catabolic hormones like cortisol and glucagon, in order to break down the protein into glucose to use as fuel. Cortisol suppresses Test and glucagon suppresses insulin, so that would explain the result. So taking protein with carbs would solve that problem, increasing insulin, not lowing T, and bathing the muscle in protein.</div>

Doubt it

Cortisol and glucagon are not required to breakdown dietary amino acids. whey proteins increase isulin.
Insulin decreases GH, just as seen in this study
 
No they're not. Both are regulatory IE a signalling mechanism and do not do the actual breaking down.

Glucagon is a purely metabolic hormone, dedicated to preventing hypoglycemia by initiating gluconeogenesis. Increases of glucagon from amino ingestion will only occur if glucose is insufficient to maintain basal levels, somewhere above 5 Mm. If carbohydrate meals are provided in regular intervals (and the liver glycogen stores are never exhausted), the blood glucagon level remains pretty constant (maintained by the basal secretion), and only the insulin level rises and falls in line with the meals.

Cortisol, when speaking of glucose homeostasis during pprolonged fasting, goes to the liver and to muscle. Muscle receives a signal that initiates protein degradation, making the amino acids alanine and glutamine available for glucose synthesis by the liver. The signal to the liver is essential for the activation of the key enzyme(s) of gluconeogenesis.
 
Well it just goes to show the oversimplification of stuff you learn, I got taught when I was doing my course that glucagon is directly responsible for breaking down amino acids into glucose.

But that that doesn't change the fact that these guys were fed only protein, which if it was WPI might have been only a few grams of carbs from the whey. It still seems like they were only looking at the effect of protein without looking at all the anabolic factors, and carbs do aid anabolism, by sparing protein and stimulating insulin. I would never eat protein without also eating a decent amount of carbs.
 
they looked at the effect of the protien on hormones because the researchers have a love affair with minor manipulations of hormones around training.
 
Quick question, does it tell us anything useful?

Can it be boiled down to a 'do' or a 'dont' for the average BBer who perhaps doesn't understand gluimonimucosenagen-related stuff ;)

S.
 
It gives us an indication of what happens in terms of hormones. THey have been trying to find an effect of the small manipulations of hormones on adaptations from resistance trainign for years and still have not found anything of use, more than likely because small acute variations in hormones are not enough to do anything. Chronic increases in something like testosterone will achieve something because they create a far greater positive amino acid balance at rest.
 
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