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Carbohydrates offer some help in muscle protein synthesis, but not enough for the desired effect

(February 25, 2004) - Bethesda, MD A visit to the meat counter at any supermarket is proof positive that a good number of Americans are avoiding carbohydrates and consuming high levels of protein and fat, in accordance with the Atkins diet. This carbohydrate-free, fat- and protein- rich diet is for those seeking immediate weight loss, which means most of us.

But what do others, such as weight lifters and callisthenic enthusiasts, do about carbohydrates? Their goal is muscle preservation and strengthening, but for years, different theories have been offered about the effectiveness of carbohydrates in maintaining an appropriate muscle protein balance. A new study may lead to a truce in the debate at the nation's gymnasiums, and those dedicated to resistance training may finally have an answer as to whether carbohydrates have a positive role in muscle development.

Background

Resistance exercise -- also called strength training -- increases muscle strength and mass, bone strength, and the body's metabolism. The different methods for resistance training include free weights, weight machines, calisthenics and resistance tubing. When using free weights, dumbbells, and bars stacked with weight plates, you are responsible for both lifting the weight and determining and controlling your body position through the range of motion.

The body's net muscle protein balance (i.e., the difference between muscle protein synthesis and protein breakdown) generally remains negative in the recovery period after resistance exercise in the absence of nutrient intake, i.e., the muscle's protein is breaking down complex chemical compounds to simpler ones. However, it has been demonstrated that infusion or ingestion of amino acids after resistance exercise stimulates muscle protein synthesis. Furthermore, as little as six grams of essential amino acids (EAA) alone effectively stimulates net protein synthesis after a strenuous resistance exercise sessio
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Contact: Donna Krupa
djkrupa1@aol.com
703-527-7357
American Physiological Society
25-Feb-2004


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