['Amino acid transporters have been proposed as regulators of protein synthesis. The primary aim of this study was to determine whether amino acid transporter expression is increased in human muscle following resistance exercise (RE) coupled with essential amino acid (EAA) ingestion, and whether a differential response occurs with aging. Secondly, we aimed to compare this response to a previous study examining RE alone.', 'Young (n\xa0=\xa07, 30\xa0±\xa02\xa0yr) and older men (n\xa0=\xa06, 70\xa0±\xa02\xa0yr) ingested EAA 1\xa0h after RE. Muscle biopsies were obtained at rest and 3 and 6\xa0h post exercise to examine amino acid transporter mRNA and protein expression.', 'In both age groups, RE\xa0+\xa0EAA increased mRNA of L-type amino acid transporter 1 (LAT1)/solute linked carrier (SLC)7A5, sodium-coupled neutral amino acid transporter 2 (SNAT2)/SLC38A2, and cationic amino acid transporter 1/SLC7A1 (p\xa0<\xa00.05). SNAT2 protein increased in young at 3 and 6\xa0h (p\xa0<\xa00.05), whereas old maintained higher LAT1 protein (p\xa0<\xa00.05). Compared to RE alone, RE\xa0+\xa0EAA enhanced amino acid transporter expression only in young (p\xa0<\xa00.05).'] Does aging differentially affect human skeletal muscle amino acid transporter expression when essential amino acids are ingested after exercise?