Fig. 4From: Effect of an enteral amino acid blend on muscle and gut functionality in critically ill patients: a proof-of-concept randomized controlled trialPlasma citrulline (nmol/mL) in the amino acid and placebo groups. Plasma citrulline concentration was assessed by ion exchange chromatography with spectrophotometric detection after ninhydrin derivatization. Values reported are mean changes from baseline at days 7, 14, 21 and 60, using a restricted maximum likelihood (REML)-based repeated measures approach. P < 0.05 at V4 and P < 0.01 at V5Back to article page