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The positive effects on strength, size and even fat loss.....Branched-chain amino acids.

Posted May 27 2010 12:25pm

Before creatine, arginine and whey protein ranked supreme as popular bodybuilding supplements, the branched-chain amino acids were the hot ticket for bodybuilders. Today, BCAAs are back on the must-have list of supplements because bodybuilders have found that they work well to enhance muscle growth, strength, energy and even fat loss. If you're not using them, here's your guide to why you should.

THE THREE AMINOS The BCAAs comprise three essential amino acids--leucine, isoleucine and valine. The name "branched-chain amino acids" is derived from the structure of these aminos--each has a forked outcropping that looks a bit like a branch. How essential are these three aminos? Well, although there are about 20 amino acids that the muscles use for muscle growth, the three BCAAs make up one-third of the total amino acids in the body's muscles.

What's really special about these three aminos is how the body handles them. When you ingest amino acids (as individual aminos or as protein), they first travel to the liver, which immediately breaks them down and uses them for fuel if the body needs them for energy rather than for rebuilding muscle and other tissues. Yet, the liver tends to spare BCAAs, sending them directly to the muscles to be used for building muscle or for fuel.

The muscles can use BCAAs, unlike other aminos, directly for fuel. This gives BCAAs two unique properties. First, during workouts, muscles readily use BCAAs for fuel. Second, during rest, such as after workouts, BCAAs are used for building muscle. These are two important considerations when it comes to the timing of supplementation: they make pre-and postworkout the critical time periods for taking BCAAs. ENERGY BOOST BCAAs are readily used for fuel by the muscles during workouts; thus, intense and longer workouts will rob more BCAAs from your muscles. To counteract this, take a BCAA supplement right before you train--because supplemental BCAAs are readily available to the muscle as a direct source of energy, your energy levels will be higher during the workout than if you had not done so.
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