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

Use of Indicator Amino Acid Oxidation Technique to Determine Protein Requirement of Elderly Female Subjects 65-75 Yrs Old

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.

Study Overview

• Status: Completed
• Conditions: Healthy
• Intervention / Treatment: Dietary supplement: protein intake.

• Study Type: Interventional
• Enrollment (Actual): 14
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Canada
  • Ontario
    • Toronto, Ontario, Canada, M5G1X8
      • The Hospital for Sick Children

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 65 years to 75 years (Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: Female

Description

Inclusion Criteria:

1. Healthy elderly females between the ages of 65 to 75 and >75 years
2. Willingness to participate in the study
3. 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.
4. Females with hypertension if well controlled by medications

Exclusion Criteria:

1. 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.
2. On medications known to affect protein and amino acid metabolism like e.g. steroids.
3. Significant weight loss during the past month.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Health Services Research
• Interventional Model: Crossover Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: protein intake; different levels of protein intake	Dietary supplement: protein intake.; •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

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
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

Collaborators and Investigators

• Sponsor: The Hospital for Sick Children
• Collaborators: Canadian Institutes of Health Research (CIHR)

Study record dates

Study Major Dates

• Study Start: November 1, 2011
• Primary Completion (Actual): August 1, 2012
• Study Completion (Actual): August 1, 2012

Study Registration Dates

• First Submitted: April 3, 2012
• First Submitted That Met QC Criteria: April 16, 2012
• First Posted (Estimate): April 17, 2012

Study Record Updates

• Last Update Posted (Estimate): August 19, 2013
• Last Update Submitted That Met QC Criteria: August 16, 2013
• Last Verified: August 1, 2013

More Information

Terms related to this study

• Keywords: protein requirement; female elderly; healthy female subject's protein requirements
• Other Study ID Numbers: 0019850580-A