{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/109310"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/109310","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The effect of leucine and dileucine ingestion on muscle protein turnover in healthy young men","abstract":"Skeletal muscle mass and quality, which is determined by day-to-day changes in muscle protein synthesis (MPS) and muscle protein breakdown rates (MPB), are important determinants of physical performance and metabolic health across all age groups. As such, identifying nutritional and exercise strategies that more robustly stimulate MPS and inhibit MPB after each meal are important to optimize skeletal muscle mass and health. The leucine content of a meal is believed to be an important anabolic characteristic of a meal. Specifically, leucine is a potent amino acid that serves both as an anabolic signaling molecule and substrate to potentiate MPS. Beyond single amino acids, food proteins also contain dipeptides. Little is known, however, about the anabolic and catabolic effects of dipeptides, whose uptake rates have been shown to be faster than corresponding free amino acid. As such, uncovering how dipeptides impact muscle protein turnover is warranted to develop more anabolic nutritional strategies. The study within this thesis aimed to determine the effect of dipeptide (i.e., leucine-leucine; DILEU) ingestion on changes in MPS and MPB rates when compared to leucine (LEU) in single form. Ten young men completed a double-blind, randomized crossover study. Participants were randomized to ingest either 2.00g of LEU or 2.47g of DILEU mixed in 150mL of water. After an overnight fast, participants received a primed constant infusion of L-[ring-13C6]- and [15N]-phenylalanine to measure MPS and MPB rates. Plasma insulin, glucose, leucine and dileucine concentrations were also measured. Results from this study demonstrated that DILEU stimulates MPS to a greater extent than LEU. There was no difference in MPB rates between conditions. Plasma insulin, glucose, leucine, and dileucine concentrations did not differ between conditions. These data suggest that DILEU may be used in food fortification or clinical feeding formulas to enhance the anabolic properties of meals.","abstract_html":"Skeletal muscle mass and quality, which is determined by day-to-day changes in muscle protein synthesis (MPS) and muscle protein breakdown rates (MPB), are important determinants of physical performance and metabolic health across all age groups. As such, identifying nutritional and exercise strategies that more robustly stimulate MPS and inhibit MPB after each meal are important to optimize skeletal muscle mass and health. The leucine content of a meal is believed to be an important anabolic characteristic of a meal. Specifically, leucine is a potent amino acid that serves both as an anabolic signaling molecule and substrate to potentiate MPS. Beyond single amino acids, food proteins also contain dipeptides. Little is known, however, about the anabolic and catabolic effects of dipeptides, whose uptake rates have been shown to be faster than corresponding free amino acid. As such, uncovering how dipeptides impact muscle protein turnover is warranted to develop more anabolic nutritional strategies. The study within this thesis aimed to determine the effect of dipeptide (i.e., leucine-leucine; DILEU) ingestion on changes in MPS and MPB rates when compared to leucine (LEU) in single form. Ten young men completed a double-blind, randomized crossover study. Participants were randomized to ingest either 2.00g of LEU or 2.47g of DILEU mixed in 150mL of water. After an overnight fast, participants received a primed constant infusion of L-[ring-13C6]- and [15N]-phenylalanine to measure MPS and MPB rates. Plasma insulin, glucose, leucine and dileucine concentrations were also measured. Results from this study demonstrated that DILEU stimulates MPS to a greater extent than LEU. There was no difference in MPB rates between conditions. Plasma insulin, glucose, leucine, and dileucine concentrations did not differ between conditions. These data suggest that DILEU may be used in food fortification or clinical feeding formulas to enhance the anabolic properties of meals.","abstract_has_math":false,"creators":["Alamilla, Rafael Armando"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Kinesiology","degree_department":null,"school":null,"contributors":["Burd, Nicholas A"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021-03-05T21:33:09Z","date_published":"2021-03-05T21:33:09Z","updated_at":"2026-07-22T22:24:50Z","subjects":["Muscle protein turnover, dipeptides, leucine, dileucine"],"languages":["en"],"rights":["Copyright 2020 Rafael Armando Alamilla"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/109310","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Burd, Nicholas A"]},{"key":"dc:creator","label":"Author","values":["Alamilla, Rafael Armando"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2021-03-05T21:33:09Z","2020-05-01","2020-05"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Kinesiology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Muscle protein turnover, dipeptides, leucine, dileucine"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2020 Rafael Armando Alamilla"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/109310"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Skeletal muscle mass and quality, which is determined by day-to-day changes in muscle protein synthesis (MPS) and muscle protein breakdown rates (MPB), are important determinants of physical performance and metabolic health across all age groups. As such, identifying nutritional and exercise strategies that more robustly stimulate MPS and inhibit MPB after each meal are important to optimize skeletal muscle mass and health. The leucine content of a meal is believed to be an important anabolic characteristic of a meal. Specifically, leucine is a potent amino acid that serves both as an anabolic signaling molecule and substrate to potentiate MPS. Beyond single amino acids, food proteins also contain dipeptides. Little is known, however, about the anabolic and catabolic effects of dipeptides, whose uptake rates have been shown to be faster than corresponding free amino acid. As such, uncovering how dipeptides impact muscle protein turnover is warranted to develop more anabolic nutritional strategies. The study within this thesis aimed to determine the effect of dipeptide (i.e., leucine-leucine; DILEU) ingestion on changes in MPS and MPB rates when compared to leucine (LEU) in single form. Ten young men completed a double-blind, randomized crossover study. Participants were randomized to ingest either 2.00g of LEU or 2.47g of DILEU mixed in 150mL of water. After an overnight fast, participants received a primed constant infusion of L-[ring-13C6]- and [15N]-phenylalanine to measure MPS and MPB rates. Plasma insulin, glucose, leucine and dileucine concentrations were also measured. Results from this study demonstrated that DILEU stimulates MPS to a greater extent than LEU. There was no difference in MPB rates between conditions. Plasma insulin, glucose, leucine, and dileucine concentrations did not differ between conditions. These data suggest that DILEU may be used in food fortification or clinical feeding formulas to enhance the anabolic properties of meals.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2021-03-04 without embargo terms","The student, Rafael Alamilla, accepted the attached license on 2020-04-30 at 15:03.","The student, Rafael Alamilla, submitted this Thesis for approval on 2020-04-30 at 15:25.","This Thesis was approved for publication on 2020-05-01 at 13:03.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15132 on 2021-03-04 at 15:32:45","Made available in DSpace on 2021-03-05T21:33:09Z (GMT). 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As such, identifying nutritional and exercise strategies that more robustly stimulate MPS and inhibit MPB after each meal are important to optimize skeletal muscle mass and health. The leucine content of a meal is believed to be an important anabolic characteristic of a meal. Specifically, leucine is a potent amino acid that serves both as an anabolic signaling molecule and substrate to potentiate MPS. Beyond single amino acids, food proteins also contain dipeptides. Little is known, however, about the anabolic and catabolic effects of dipeptides, whose uptake rates have been shown to be faster than corresponding free amino acid. As such, uncovering how dipeptides impact muscle protein turnover is warranted to develop more anabolic nutritional strategies. The study within this thesis aimed to determine the effect of dipeptide (i.e., leucine-leucine; DILEU) ingestion on changes in MPS and MPB rates when compared to leucine (LEU) in single form. Ten young men completed a double-blind, randomized crossover study. Participants were randomized to ingest either 2.00g of LEU or 2.47g of DILEU mixed in 150mL of water. After an overnight fast, participants received a primed constant infusion of L-[ring-13C6]- and [15N]-phenylalanine to measure MPS and MPB rates. Plasma insulin, glucose, leucine and dileucine concentrations were also measured. Results from this study demonstrated that DILEU stimulates MPS to a greater extent than LEU. There was no difference in MPB rates between conditions. Plasma insulin, glucose, leucine, and dileucine concentrations did not differ between conditions. These data suggest that DILEU may be used in food fortification or clinical feeding formulas to enhance the anabolic properties of meals.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2021-03-04 without embargo terms","The student, Rafael Alamilla, accepted the attached license on 2020-04-30 at 15:03.","The student, Rafael Alamilla, submitted this Thesis for approval on 2020-04-30 at 15:25.","This Thesis was approved for publication on 2020-05-01 at 13:03.","DSpace SAF Submission Ingestion Package generated from Vireo submission #15132 on 2021-03-04 at 15:32:45","Made available in DSpace on 2021-03-05T21:33:09Z (GMT). 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