{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/100919"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/100919","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Manipulating dietary protein density and its effect on training-induced muscle performance and overall health among middle-aged adults","abstract":"By 2050, the aging population worldwide is expected to increase vastly. This has major implications as the progressive loss of muscle strength is a common consequence of aging and negatively impacts physical performance and ultimately, independence and quality of life. The underlying mechanistic cause of this age-related strength loss is likely related to alterations in overall muscle mass and neuromuscular function. It has been proposed that lifestyle modifications to include exercise training and higher dietary protein intakes will likely be the most effective approach to offset muscle strength loss with advancing age. Thus, the study within this thesis aimed to examine the effect of manipulating the protein density of the diet in combination with resistance training on skeletal muscle strength and performance adaptations in middle-aged men and women. Fourteen healthy middle-aged adults were randomly assigned to consume protein at the Recommended Dietary Allowance (RDA; 0.8 – 1.0 g • kg BW-1 • day-1) or twice the Recommended Dietary Allowance (2×RDA; 1.6 – 1.8 g • kg BW-1 • day-1) throughout a supervised 10-week progressive resistance training program. Body composition, muscle strength and performance were evaluated pre- and post-intervention. Results of this study demonstrate that resistance training induced gains in lean body mass and muscle strength are not potentiated when consuming protein in far excess of the protein RDA in middle-aged adults. Thus, consuming protein slightly above the RDA (1.2 g • kg BW-1 • day-1) is adequate to support training-induced muscle adaptations when adhering to a healthy eating pattern consisting of equally distributed protein meals throughout the day.","abstract_html":"By 2050, the aging population worldwide is expected to increase vastly. This has major implications as the progressive loss of muscle strength is a common consequence of aging and negatively impacts physical performance and ultimately, independence and quality of life. The underlying mechanistic cause of this age-related strength loss is likely related to alterations in overall muscle mass and neuromuscular function. It has been proposed that lifestyle modifications to include exercise training and higher dietary protein intakes will likely be the most effective approach to offset muscle strength loss with advancing age. Thus, the study within this thesis aimed to examine the effect of manipulating the protein density of the diet in combination with resistance training on skeletal muscle strength and performance adaptations in middle-aged men and women. Fourteen healthy middle-aged adults were randomly assigned to consume protein at the Recommended Dietary Allowance (RDA; 0.8 – 1.0 g • kg BW-1 • day-1) or twice the Recommended Dietary Allowance (2×RDA; 1.6 – 1.8 g • kg BW-1 • day-1) throughout a supervised 10-week progressive resistance training program. Body composition, muscle strength and performance were evaluated pre- and post-intervention. Results of this study demonstrate that resistance training induced gains in lean body mass and muscle strength are not potentiated when consuming protein in far excess of the protein RDA in middle-aged adults. Thus, consuming protein slightly above the RDA (1.2 g • kg BW-1 • day-1) is adequate to support training-induced muscle adaptations when adhering to a healthy eating pattern consisting of equally distributed protein meals throughout the day.","abstract_has_math":false,"creators":["Martinez, Isabel G."],"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":2018,"date_issued":"2018-09-04T20:26:48Z","date_published":"2018-09-04T20:26:48Z","updated_at":"2026-07-22T22:24:38Z","subjects":["Protein nutrition, resistance training, muscle mass, physical performance, aging"],"languages":["en"],"rights":["Copyright 2018 Isabel Martinez"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/100919","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":["Martinez, Isabel G."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-04T20:26:48Z","2018-03-29","2018-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"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":["Protein nutrition, resistance training, muscle mass, physical performance, aging"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 Isabel Martinez"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/100919"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["By 2050, the aging population worldwide is expected to increase vastly. This has major implications as the progressive loss of muscle strength is a common consequence of aging and negatively impacts physical performance and ultimately, independence and quality of life. The underlying mechanistic cause of this age-related strength loss is likely related to alterations in overall muscle mass and neuromuscular function. It has been proposed that lifestyle modifications to include exercise training and higher dietary protein intakes will likely be the most effective approach to offset muscle strength loss with advancing age. Thus, the study within this thesis aimed to examine the effect of manipulating the protein density of the diet in combination with resistance training on skeletal muscle strength and performance adaptations in middle-aged men and women. Fourteen healthy middle-aged adults were randomly assigned to consume protein at the Recommended Dietary Allowance (RDA; 0.8 – 1.0 g • kg BW-1 • day-1) or twice the Recommended Dietary Allowance (2×RDA; 1.6 – 1.8 g • kg BW-1 • day-1) throughout a supervised 10-week progressive resistance training program. Body composition, muscle strength and performance were evaluated pre- and post-intervention. Results of this study demonstrate that resistance training induced gains in lean body mass and muscle strength are not potentiated when consuming protein in far excess of the protein RDA in middle-aged adults. Thus, consuming protein slightly above the RDA (1.2 g • kg BW-1 • day-1) is adequate to support training-induced muscle adaptations when adhering to a healthy eating pattern consisting of equally distributed protein meals throughout the day.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-08-31 without embargo terms","The student, Isabel Martinez, accepted the attached license on 2018-03-29 at 12:09.","The student, Isabel Martinez, submitted this Thesis for approval on 2018-03-29 at 12:21.","This Thesis was approved for publication on 2018-03-29 at 14:11.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12097 on 2018-08-31 at 17:10:26","Made available in DSpace on 2018-09-04T20:26:48Z (GMT). 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The underlying mechanistic cause of this age-related strength loss is likely related to alterations in overall muscle mass and neuromuscular function. It has been proposed that lifestyle modifications to include exercise training and higher dietary protein intakes will likely be the most effective approach to offset muscle strength loss with advancing age. Thus, the study within this thesis aimed to examine the effect of manipulating the protein density of the diet in combination with resistance training on skeletal muscle strength and performance adaptations in middle-aged men and women. Fourteen healthy middle-aged adults were randomly assigned to consume protein at the Recommended Dietary Allowance (RDA; 0.8 – 1.0 g • kg BW-1 • day-1) or twice the Recommended Dietary Allowance (2×RDA; 1.6 – 1.8 g • kg BW-1 • day-1) throughout a supervised 10-week progressive resistance training program. Body composition, muscle strength and performance were evaluated pre- and post-intervention. Results of this study demonstrate that resistance training induced gains in lean body mass and muscle strength are not potentiated when consuming protein in far excess of the protein RDA in middle-aged adults. Thus, consuming protein slightly above the RDA (1.2 g • kg BW-1 • day-1) is adequate to support training-induced muscle adaptations when adhering to a healthy eating pattern consisting of equally distributed protein meals throughout the day.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-08-31 without embargo terms","The student, Isabel Martinez, accepted the attached license on 2018-03-29 at 12:09.","The student, Isabel Martinez, submitted this Thesis for approval on 2018-03-29 at 12:21.","This Thesis was approved for publication on 2018-03-29 at 14:11.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12097 on 2018-08-31 at 17:10:26","Made available in DSpace on 2018-09-04T20:26:48Z (GMT). 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