Does adding carbs to essential amino-acids, increase protein synthesis?
EAA’s vs EAA’s+CHO effects on muscle protein synthesis
It is often stated that the combination of carbohydrate (CHO)+ Essential amino-acids (EAA) is more effective at stimulating muscle protein synthesis than EAA/protein alone. This blog entry reviews two very closely matched studies to get a more accurate picture of the answer to the question at hand.
The first study uses a beverage of 6g of EAA+35g of CHO. The other study uses just 6g of EAA and no carbohydrate included. Using the typical measurement of muscle protein synthesis by looking at net uptake of phenylalanine, the values between the EAA+CHO group were compared to the EAA only group of subjects. The results showed, the EAA+CHO brought about NO greater stimulation of muscle protein synthesis than the EAA only group. In terms of muscle building, adding carbs to EAA’s shows no additional benefit.
Miller SL, Tipton KD, Chinkes DL, Wolf SE, Wolfe RR. Independent and combined effects of amino acids and glucose after resistance exercise.Med Sci Sports Exerc. 2003 Mar;35(3):449-55.
Børsheim E, Tipton KD, Wolf SE, Wolfe RR.
Essential amino acids and muscle protein recovery from resistance exercise. Am J Physiol Endocrinol Metab. 2002 Oct;283(4):E648-57.
BY: Athletic Edge Nutrition, The Nutrient Timing Specialists.
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December 10, 2008 - 3:22 pm MDT at 3:22 pm
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