Determination of Protein Requirement in Elderly Female Subjects 65-75 Yrs Old

NCT01578733 | Completed

• 1 other identifier: 0019850580-A
• Study Type: interventional
• Target: 14
• Locations: 1 country
• Sites: 1

Brief Summary

Minimal data are available on protein requirements throughout the lifespan. Currently available recommendations are based on nitrogen balance data. The limitations of the nitrogen balance method have been well described. Importantly, nitrogen balanced underestimates requirements. The current DRI requirement for healthy adult males is based on the reanalysis of the nitrogen balance date from Young and Scrimshaw. This data was reanalyzed statistically by Rand et al. and he concluded that the protein requirement of healthy adults was 0.65 and 0.83 (mean and RDA) g/kg/day of good quality protein. Using IAAO, the investigators group estimated the protein requirement of young men (mean age 27 years) to be 0.93 and 1.2 g/kg/day (mean and RDA). Currently there are no studies on protein requirement in the elderly. In a recent nutrition survey conducted by NHANES, the authors concluded that adults between the ages of 51 - 70 years old consumed an average on 1.0 g/kg/day (ideal body weight) of protein which represents about 15 % of calories. Depending on the calculations used for ideal body weight some older adults could be getting higher or lower than requirement. There is no scientifically derived protein estimate for older adults. Therefore there is a need to measurer protein requirement in that population. The goal of this study therefore is to measure the protein requirement of female elderly subjects between the ages of 65 - 70 years using the IAAO technique.

Conditions

Healthy

Keywords

protein requirement; female elderly; healthy female subject's protein requirements

Outcome Measures

Primary Outcomes (1)

• 13CO2 production

  Urine and breath samples will be collected on day 3 of the experiment in order to determine to rate of production of 13CO2, phenylalanine flux and oxidation.

  Study Day 3

Study Arms (1)

protein intake

EXPERIMENTAL

different levels of protein intake

Dietary Supplement: protein intake.

Interventions

protein intake. DIETARY_SUPPLEMENT

•Protein intakes will be varied at 0.2, 0.5, 0.7, 0.9,1.0, 1.2, 1.5, 1.8g, 2.0g/kg/day

protein intake

Eligibility Criteria

• Age: 65 Years - 75 Years
• Sex: female
• Healthy Volunteers: Yes
• Age Groups: Older Adult (65+)

You may qualify if:

• Healthy elderly females between the ages of 65 to 75 and \>75 years
• Willingness to participate in the study
• Females without a chronic disease or acute illness that could affect protein and AA metabolism eg, diabetes, cancer, liver or kidney disease, HIV, acute cold or flu, hypo or hyperthyroidism, rheumatoid arthritis treated with anti-inflammatory medications.
• Females with hypertension if well controlled by medications

You may not qualify if:

• Presence of disease known to affect protein and AA requirement and synthesis like diabetes, cancer, liver o kidney disease, HIV, acute cold or flu, hypo or hyperthyroidism, rheumatoid arthritis treated with anti-inflammatory medications.
• On medications known to affect protein and amino acid metabolism like e.g. steroids.
• Significant weight loss during the past month.

Sponsors & Collaborators

• The Hospital for Sick Children: lead
• Canadian Institutes of Health Research (CIHR): collaborator

Study Sites (1)

The Hospital for Sick Children

Toronto, Ontario, M5G1X8, Canada

Location

Study Officials

• Paul Pencharz, MD

  The Hospital for Sick Children

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Masking: NONE
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Senior Sicentist, Research Institute, The Hospital for Sick Children

Study Record Dates

• First Submitted: April 3, 2012
• First Posted: April 17, 2012
• Study Start: November 1, 2011
• Primary Completion: August 1, 2012
• Study Completion: August 1, 2012
• Last Updated: August 19, 2013

Record last verified: 2013-08

Locations

CA (1)