The amino acid profile of the casein diet was poorly correlated with that of the shrimps. The efficiency of retention of synthesized protein as growth was 94% for shrimps fed the fish meal diet, suggesting a very low protein turnover rate by contrast, the retention of synthesized protein was only 80% for shrimps fed the casein diet. Survival, specific growth and protein synthesis rates were higher, and protein degradation was lower, in shrimps fed a fish/squid/shrimp meal diet, or a 50% laboratory diet/50%soybean meal variant diet, than in those fed a casein-based diet. Protein synthesis was investigated by a flooding dose of tritiated phenylalanine. PMID 15914508.The effect of dietary protein on protein synthesis and growth of juvenile shrimps Litopenaeus vannamei was investigated using three different diets with equivalent protein content. "Dietary protein intake impacts human skeletal muscle protein fractional synthetic rates after endurance exercise". ^ Bolster DR, Pikosky MA, Gaine PC, Martin W, Wolfe RR, Tipton KD, et al."Level of dietary protein impacts whole body protein turnover in trained males at rest". ^ Gaine PC, Pikosky MA, Martin WF, Bolster DR, Maresh CM, Rodriguez NR (April 2006)."Aerobic exercise training increases skeletal muscle protein turnover in healthy adults at rest". ^ Pikosky MA, Gaine PC, Martin WF, Grabarz KC, Ferrando AA, Wolfe RR, Rodriguez NR (February 2006).Protein Turnover in Brain Synthesis and Degradation. "Proteome half-life dynamics in living human cells". ^ Eden E, Geva-Zatorsky N, Issaeva I, Cohen A, Dekel E, Danon T, et al. "Protein homeostasis: live long, won't prosper". ^ Toyama BH, Hetzer MW (January 2013).However, if protein breakdown falls too low then the body would not be able to remove muscle cells that have been damaged during workouts which would in turn prevent the growth of new muscle cells. Some bodybuilding supplements claim to reduce the protein breakdown by reducing or blocking the number of catabolic hormones within the body. A diet high in protein increases whole body turnover in endurance athletes. Protein turnover in the exercise science įour weeks of aerobic exercise has been shown to increase skeletal muscle protein turnover in previously unfit individuals. This results in an increase in the amount of damaged protein within the body. Protein turnover is believed to decrease with age in all senescent organisms including humans. Dunlop, protein turnover occurs in brain cells the same as any other eukaryotic cells, but that "knowledge of those aspects of control and regulation specific or peculiar to brain is an essential element for understanding brain function." More synthesis than breakdown indicates an anabolic state that builds lean tissues, more breakdown than synthesis indicates a catabolic state that burns lean tissues. Different types of proteins have very different turnover rates.Ī balance between protein synthesis and protein degradation is required for good health and normal protein metabolism. In cell biology, protein turnover refers to the replacement of older proteins as they are broken down within the cell.
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