Fig. 1: Schematic representation of the A-V balance method.
From: Tracing metabolic flux to assess optimal dietary protein and amino acid consumption

Red circles represent tracers. This approach is useful for measuring leg muscle protein synthesis and breakdown as well as amino acid transmembrane transport. The same model can be used across the forearm, except that the inability to obtain a muscle biopsy will limit the accuracy of the estimation of protein synthesis and breakdown, and transmembrane transport cannot be quantified. PS protein synthesis; PB protein breakdown. This figure was created with BioRender.com.