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United States Department of Agriculture

Agricultural Research Service

Research Project: Methodology Development: Energy Intake and Body Composition Assessment in the Elderly

Location: Human Nutrition Research Center on Aging

Project Number: 1950-51000-071-03
Project Type: Specific Cooperative Agreement

Start Date: Apr 17, 2009
End Date: Apr 16, 2014

1. Develop and validate mathematical models for carbon kinetics that simulate energy intake, energy regulation, and their relationship to body composition and fat stores. 2. Develop and validate practical field tools for the assessment and management of sarcopenia, dehydration, zinc status and frailty in institutionalized and community living elderly.

Simple monitoring of isotope clearance in breath CO2 can provide quantitative information on average energy intake. Our approach includes the use of a single stable isotope administration (C-13 palmitic acid) and monitoring its disappearance in breath CO2. We will use both mathematical modeling and clinical validation of this approach. The development and validation of new portable body composition tools will include the comparison of a hand-held caliper X-ray absorptiometer against tissue analysis by computerized tomography and the full evaluation of a nondestructive method for rapid analysis of extracellular water by X ray fluorescence analysis for stable bromine. For free-living elderly, we expect that portable body composition tools will provide an additional way to help monitor their medical, functional, and nutritional status so that they can extend safely their independent living.

Last Modified: 4/16/2014
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