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Atrophy of skeletal muscle is observed in response to immobilization and lack of weight-bearing. The aim of this study was to investigate the effect of immobilization on muscle protein synthesis and associated biochemical parameters in skeletal muscle of healthy volunteers employing a standardized model of lower limb unloading. One leg was unloaded for 10 days, and percutaneous muscle biopsies were taken before and at the end of the unloading period. The capacity for protein synthesis, as reflected by the concentration of RNA, decreased by 16% (P < 0.05) although the fractional synthesis rate (FSR) of protein was not significantly changed after 10 days of unloading. Furthermore there was an increase in the concentration of the free branched chain amino acids in muscle by 48% (P < 0.05).
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E Hultman, and
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M A McNurlan, and
J Wernerman
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June 2003,
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