During a stable isotope infusion trial ( l - [ ring - ( 13 ) C6 ] Phe ; l - [ 1 - ( 13 ) C ] Leu ) , older men performed RE and , at 1 h after exercise , ingested 10 g of essential amino acids ( EAAs ) containing either a Leu content similar to quality protein ( control , 1.85 g of Leu , n = 7 ) or enriched Leu ( LEU ; 3.5 g of Leu , n = 8 ) .