Carbs & EAA = Muscle Growth

[RicPhoenix]

Here is some research (from an Aussie!) that varifies what we strength and muscle athletes should already know:





Nutrition
Volume 22, Issue 4 , April 2006, Pages 367-375



Effects of liquid carbohydrate/essential amino acid ingestion on acute
hormonal response during a single bout of resistance exercise in
untrained men

Stephen P. Bird B.H.M.S. (Hons.), , Kyle M. Tarpenning Ph.D. and Frank
E. Marino Ph.D.

School of Human Movement Studies, Charles Sturt University, Bathurst,
New South Wales, Australia

Received 31 March 2005; accepted 8 November 2005. Available online
10 February 2006.



Abstract
Objective

The primary objective of this study was to investigate the influence
of nutritive interventions on acute hormonal responses to a single
bout of resistance exercise in untrained young men. Specifically, the
aim was to determine whether the acute hormonal milieu conducive to
enhancing skeletal muscle hypertrophic adaptation to resistance
training could be created. The potential role of cortisol in
inhibiting training-induced muscle growth is of particular interest,
as is whether exercise-induced cortisol release can be attenuated by
nutritive interventions.
Methods

After a 4-h fast, 32 subjects performed a single bout of resistance
exercise (60 min), during which they consumed a 6% carbohydrate (CHO)
solution, a 6-g essential amino acid (EAA) mixture, a combined CHO+EAA
supplement, or a placebo beverage. Blood samples were collected every
15 min throughout the exercise bout, immediately after exercise, and
15 and 30 min after exercise for analysis of total testosterone,
cortisol, growth hormone, insulin, and glucose.
Results

No significant change in glucose or insulin was observed for placebo.
CHO and CHO+EAA ingestion resulted in significantly (P < 0.001)
increased glucose and insulin concentrations above baseline, whereas
EAA resulted in significant postexercise increases (P < 0.05) in
insulin only. Placebo exhibited a significant increase in cortisol
within 30 min (P < 0.01), with a peak increase of 105% (P < 0.001)
immediately after exercise, and cortisol remained 54% above baseline
at 30 min after exercise (P < 0.05). Conversely, the treatment groups
displayed no significant change in cortisol during the exercise bout,
with CHO and CHO+EAA finishing 27% (P < 0.01) and 23% (P < 0.05),
respectively, below baseline at 30 min after exercise. No
between-group differences in exercise-induced growth hormone or
testosterone concentrations after nutritive intervention were present.
Conclusion

These data indicate that CHO and/or EAA ingestion during a single bout
of resistance exercise suppresses the exercise-induced cortisol
response, in addition to stimulating insulin release. We conclude that
the exercise-induced hormonal profile can be influenced by nutritive
interventions toward a profile more favorable for anabolism.

Keywords: Resistance exercise; Carbohydrate/essential amino acid
supplementation; Acute hormonal response


This research was supported in part by Musashi and the Gatorade Sports
Science Institute.In memory of the late Kyle Tarpenning, Ph.D.
Corresponding author. Tel.: +612-6338-4155; fax: +612-6338-4065.

 

[Ashop]

Good information.