Intervention: The intervention consists of a single test day during which the subjects will receive a drink containing 20 gram intrinsically labelled casein with or without 60 gram carbohydrates. In addition, continuous intravenous tracer infusions of labeled amino acids will be administered. During the test day 18 plasma samples and 4 muscle biopsies will be collected over a period of 8½ h. Furthermore, muscle skeletal blood flow will be estimated using sidestream darkfield imaging (SDF) in sublingual position.