“Nutritional Strategies to Augment the Postprandial Muscle Protein Synthetic Response to the Ingestion of a Low Dose of Protein in Middle-aged Women”
Using stable isotope methodology, investigators will determine the postabsorptive and postprandial muscle protein synthetic response in 60 female adults (Age 50-79, BMI: <30 kg/m2) immediately after an acute bout of resistance exercise. Participants will be divided in to 5 groups of twelve women (n=12). Each group will receive a different protein beverage or placebo to consume following the resistance exercise training. Group 1 will consume a beverage consisting of whey protein; group 2 will consume whey protein supplemented with additional leucine; group 3 will consume whey protein supplemented with additional leucine and hydrolyzed whey peptides; group 4 will consume whey protein supplemented with additional leucine and citrulline; group 5 will just consume water. During the testing, blood and muscle samples will be collected.
Behavioral - Resistance Exercise
Participants will perform unilateral leg extension exercise immediately prior to ingestion of the experimental beverage
Dietary Supplement - 14 g Whey protein
Dietary Supplement - 6.6 g Whey protein + 1.25 g leucine
Dietary Supplement - 4 g Whey protein + 1.25 g leucine + 2.6 g Whey peptides
Dietary Supplement - 6.6 g Whey protein + 1.25 g leucine + 0.8 g Citrulline