Each subject will participate in 2 experimental test days, separated by 14 days, with each day lasting 8.5 h. During a test day, subjects perform a single bout of knee extension exercise and will ingest a 135-gram of minced beef patty containing 35 g of protein or an isonitrogenous-matched milk protein beverage. The use of a L-[ring-2H5]-phenylalanine, L-[ring-2H2]-tyrosine, and [1-13C]-leucine infusion will allow us to assess the digestion and absorption kinetics of the ingested protein source and the fractional synthetic rate (FSR) of muscle proteins in the fasting and fed state in an in vivo human setting.