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Impact of timing of protein intake on nitrogen balance in exercising older individuals on a hypercaloric diet

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dc.contributor.authorMinor, Brian, author
dc.contributor.authorMiller, Benjamin, advisor
dc.contributor.authorHamilton, Karyn, committee member
dc.contributor.authorMelanson, Ed, committee member
dc.contributor.authorHickey, Matthew, committee member
dc.contributor.authorMelby, Christopher, committee member
dc.date.accessioned2007-01-03T05:49:59Z
dc.date.available2007-01-03T05:49:59Z
dc.date.issued2011
dc.description.abstractWe have previously shown that in older adults, consumption of protein in the form of chocolate milk immediately after exercise enhances nitrogen balance (NBAL) when energy balance is maintained. Since it is known that hypercaloric diets increase nitrogen (N) retention, it is important to know if the timing of protein intake after aerobic exercise provides further increases in N retention compared to the consumption of carbohydrate only post exercise. PURPOSE: To investigate if consumption of protein and carbohydrate (PRO + CHO) immediately after exercise as opposed to earlier in the day can improve NBAL in older individuals consuming a hypercaloric diet. METHODS: In a randomized cross-over design, subjects completed two separate 3-day exercise and nutrition interventions. Exercise (60 minutes of stationary cycling at 55% of VO2max) was performed daily at 4:30 PM. Diets were hypercaloric (calculated at +15% daily intake), with a PRO+CHO or carbohydrate only (CHO) drink consumed at 10 am and the opposite drink consumed after exercise (5:30 PM). Both diets (1.2 g protein/kg bodyweight, 30% fat, and balance as carbohydrate) were isonitrogenous and isocaloric with only the timing of the drinks differing. A 24 hour stay in a metabolic chamber confirmed positive energy balance while 24-hour urine collections determined NBAL. RESULTS: The 3-day mean NBAL was not significantly different (p=.0881) (n=6) between the CHO trial (.970 ± .517 g N) and the PRO + CHO trial (1.659 ± .430 g N) although a trend toward increased NBAL with PRO+CHO was apparent. The mean energy balance was not significantly different (p=.2906) between the CHO trial (+13.09 ± 1.94%) and the PRO + CHO trial (+ 14.28 ± 1.75%). Further analyses comparing the positive energy balance cohort to previously completed negative, and even energy balance cohorts distinguished the role of energy balance and timing of nutrition effects. CONCLUSION: Older individuals in positive energy balance do not maintain a significantly more positive NBAL balance by consuming protein after aerobic exercise as opposed to earlier in the day although energy balance does change the effect of protein timing on NBAL.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierMinor_colostate_0053N_10689.pdf
dc.identifier.urihttp://hdl.handle.net/10217/52121
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectnitrogen balance
dc.subjectwasting
dc.subjectsarcopenia
dc.subjectolder individuals
dc.subjectprotein timing
dc.subjectexercise
dc.titleImpact of timing of protein intake on nitrogen balance in exercising older individuals on a hypercaloric diet
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineHealth and Exercise Science
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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