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What’s the Deal with Muscle Protein Breakdown?
It is easy to understand the importance of muscle protein synthesis, as that is the metabolic basis for building muscle. But why do muscles need to be broken down as part of muscle protein turnover?
We’ve already learned that muscle protein breakdown is essential in the time between meals when other important tissues and organs need a constant supply of essential amino acids. Muscle protein breakdown also helps improve muscle function.
Muscle fibers become damaged during exercise and do not generate the same contractile force as new fibers. In steps muscle protein turnover to get rid of the older, damaged fibers (protein breakdown) and replace them with new, better-functioning fibers (protein synthesis).
Accelerated muscle protein turnover can improve athletic training, even if total muscle mass does not change. A heavy workout induces local inflammation due to the damaged muscle fibers—the more rapid the muscle turnover, the more quickly the post-exercise inflammation will subside.
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