If you are trying to build muscle, you are (or should be) taking supplemental protein. But, it isn't the protein your body really needs. When you take your protein, your body breaks it down into amino acids during the digestion process. These amino acids are small enough to be absorbed into the blood stream and can be used by cells to repair muscle tissue, creating new muscle. There are twenty-two identified amino acids. Eight of which are essential amino acids, meaning your body can not synthesize them and has to obtain them through diet (milk, meat, and eggs).
BCAA's.
While all essential amino acids are important to build muscular strength and size, some are more important than others. Valine, leucine, and isoleucine are known as branched chain amino acids (BCAA's) due to their molecular structure, which features branched chains of carbon extending from their primary carbon structure. BCAA's are unique because they are metabolized in the muscle, and not the liver. When an adequate amount of BCAA's are ingested, they promote an increase in protein synthesis. This results in an increase of muscle growth and recovery time.
Amino Acids as an Energy Source.
When glycogen levels in the liver and muscles are low (common in low-carb dieting or overall low amount of calories), your body will tap into amino acids as an energy source. This potentially burns up amino acids that could be used in protein synthesis and to promote the building of new muscle tissue and faster muscle recovery. It is common to take BCAA's before a heavy cardio workout to prevent the breakdown of any muscle tissue.
After your workout, your body is breaking down muscle tissue with a deficit in protein synthesis. This is the best time to take BCAA's. They will increase your body's rate of protein synthesis and aid in repairing your muscle tissue. Otherwise, your body might not be getting the most out of every workout.
-AO
Source:
MuscleandStrength.com
BodyBuilding.com
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