Dropping Amino Acid?
Dropping Amino Acid and the truth behind those that use them. MYTH: To get huge, bodybuilders should eat as much as possible…all day long. Bodybuilders should even stick an IV drip of amino acids into their arms and sleep with a continuous supply of them pulsing through their body to maintain continuous protein synthesis!
Amino Acids and the TRUTH: Science actually supports just the opposite. Continuous infusion of amino acids via IVs has been shown to be less effective at stimulating protein synthesis than intermittent feeding with protein. The boosting of muscle protein synthesis by a meal or amino acids is rapid and is sustained for at least two hours but then declines toward normal levels, which occurs in conjunction with the changes in circulating insulin and aminos.The signaling protein mTOR, which catalyzes muscle protein synthesis, is stimulated by both insulin and amino acids, especially the amino leucine.
Researchers from McMaster University in Hamilton, Ontario, reported recently that men who consumed whey protein after exercise, either by consuming the entire drink rapidly or consuming it spaced every 20 minutes over a 200-minute feeding period, had dramatically different results despite consuming the same amount. Muscle biopsies taken from the subjects found that muscle protein synthesis was elevated to a greater extent after rapidly consuming a large single dose of whey protein than after consuming it in smaller portions over a longer period. There were greater changes in anabolic signaling pathways for muscle hypertrophy (growth) after rapid rather than slow consumption.
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