Determination of Protein Requirements in Elderly Female Subjects >75 Yrs Old

Healthy Females Clinical Trial

Official title:

Use of Indicator Amino Acid Oxidation Technique to Determine Protein Requirement of Elderly Female Subjects >75 Years Old

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01604980
• Other study ID #: 0019850580-B
• Status: Completed
• Phase: N/A
• First received: May 22, 2012
• Last updated: January 5, 2018
• Start date: March 2012
• Est. completion date: December 2012

Study information

• Verified date: January 2018
• Source: The Hospital for Sick Children
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial 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 >75 years using the IAAO technique.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 14
• Est. completion date: December 2012
• Est. primary completion date: December 2012
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Female
• Age group: 76 Years to 90 Years

Eligibility

Inclusion Criteria:

1. Healthy elderly females >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.

4. Individual on weight reducing diets.

5. Inability to tolerate the diet or unwilling to have blood drawn from a venous access for the purposes of the study.

6. Significant coffee consumption of more than 2 cups/day (400 mg of caffeine/day)

7. Significant Alcohol consumption of more than one drink/day ( 1 beer, ½ glass of wine) -

Related Conditions & MeSH terms

• Healthy Females
• Protein Requirement

Intervention

Dietary Supplement:
• Protein intake.
protein intakes will be varied at 0.2, 0.5, 0.7, 0.9, 1.0, 1.2, 1.5, 1.8 and 2.0g/kg/day

Locations

Country	Name	City	State
Canada	The Hospital for Sick Children	Toronto	Ontario

Sponsors (2)

Lead Sponsor	Collaborator
The Hospital for Sick Children	Canadian Institutes of Health Research (CIHR)

Country where clinical trial is conducted

Canada, 

References & Publications (1)

Rafii M, Chapman K, Owens J, Elango R, Campbell WW, Ball RO, Pencharz PB, Courtney-Martin G. Dietary protein requirement of female adults >65 years determined by the indicator amino acid oxidation technique is higher than current recommendations. J Nutr. 2015 Jan;145(1):18-24. doi: 10.3945/jn.114.197517. Epub 2014 Oct 15. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	13CO2 Production	Urine and breath samples will be collected on day 3 of the experiment to determine the rate of production	Study Day 3