Method To Measure Protein Digestion & Absorption

February 3, 2022 updated by: Marielle PKJ Engelen, PhD, Texas A&M University

Validation Of A New Method To Simultaneously Measure Protein Digestion And Absorption

The aim of the present study is to validate a new method in healthy volunteers and those diagnosed with COPD and CHF that is able to measure protein digestion and absorption simultaneously. This method is used to quantify digestion and absorption in patients who are suspect of impaired digestion and absorption resulting in loss of nutrients.Findings may be used to develop treatment strategies to improve protein digestion and absorption in these patient groups.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

The study involves 1 screening visit of approximately 1-2 hours and 1 test day of approximately 8 hours. On the study day protein digestion and absorption will be measured using a mixture of amino acids that are made slightly heavier than normal, called stable isotopes. Subjects will receive feeding by sips to monitor changes in digestion and absorption, which can be picked up by stable isotope technology.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
74

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Texas
      • College Station, Texas, United States, 77843
        • Texas A&M University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

20 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

IInclusion and exclusion criteria for study participation:

We will enroll subjects (males and females of all races) based on the inclusion/exclusion criteria described below. All subjects should be able to walk, sit and stand up indepedently. Screening procedures will be done prior to the study.

Inclusion criteria - CHF subjects:

  • Ability to walk, sit down and stand up independently
  • Age 45 years or older
  • Ability to lie in supine or elevated position for 9 hours
  • Diagnosis of CHF; under regular care by cardiologist
  • Reduced ejection fraction (<45%) assessed in the past 2 years
  • NYHA class II-IV
  • Clinically stable condition; no hospitalization 4 weeks preceding first study day
  • Willingness and ability to comply with the protocol

Inclusion criteria - COPD subjects:

  • Ability to walk, sit down and stand up independently
  • Age 45 years or older
  • Ability to lie in supine or elevated position for 8 hours
  • Diagnosis of moderate to very severe chronic airflow limitation and compliant to the following criteria: FEV1 < 70% of reference FEV1
  • Clinically stable condition and not suffering from a respiratory tract infection or exacerbation of their disease (defined as a combination of increased cough, sputum purulence, shortness of breath, systemic symptoms such as fever, and a decrease in FEV1 > 10% compared with values when clinically stable in the preceding year) at least 4 weeks prior to the first test day
  • Shortness of breath on exertion
  • Willingness and ability to comply with the protocol

Inclusion criteria - healthy subjects:

  • Healthy male & female according to the investigator's or appointed staff's judgment
  • Age 45 years and older, or 20 - 30 for healthy young group

Exclusion Criteria - all subjects:

  • Any condition that may interfere with the definition 'healthy subject' according to the investigator's judgment (healthy subjects only)
  • Established diagnosis of malignancy
  • History of untreated metabolic diseases including hepatic or renal disorder
  • Presence of acute illness or metabolically unstable chronic illness
  • Presence of fever within the last 3 days
  • Body mass index >40 kg/m2 (healthy subjects only)
  • Any other condition according to the PI or nurse that was found during the screening visit, that would interfere with the study or safety of the patient
  • Use of protein or amino acid containing nutritional supplements within 5 days prior first study day
  • Current Use of long-term oral corticosteroids (CHF only)
  • Use of short course of oral corticosteroids within 4 weeks preceding first study day
  • Failure to give informed consent or Investigator's uncertainty about the willingness or ability of the subject to comply with the protocol requirements
  • (Possible) pregnancy
  • Already enrolled in another clinical trial and that clinical trial interferes with participating in this study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Supportive Care
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Other: Healthy

screening visit: body weight and composition by DXA, height, and vital signs will be assessed.

study day: stable isotope infusions with blood draws, sip feed
Other: sip feeding with stable isotope infusion
such as glycerol, D2O, tyrosine, phenylalanine, glucose, arginine, and citrulline
Other: Chronic Obstructive Pulmonary Disorder

screening visit: body weight and composition by DXA, height, and vital signs will be assessed. Subjects may sign a medical release form to obtain medical information about them that will help determine study eligibility or can be used for later coding.

study day: stable isotope infusions with blood draws, sip feed
Other: sip feeding with stable isotope infusion
such as glycerol, D2O, tyrosine, phenylalanine, glucose, arginine, and citrulline
Other: Chronic Heart Failure

screening visit: body weight and composition by DXA, height, and vital signs will be assessed. Subjects may sign a medical release form to obtain medical information about them that will help determine study eligibility or can be used for later coding.

study day: stable isotope infusions with blood draws, sip feed
Other: sip feeding with stable isotope infusion
such as glycerol, D2O, tyrosine, phenylalanine, glucose, arginine, and citrulline

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
protein metabolism in gut
Time Frame: In postabsorptive and prandial state every 20 minutes up to 8 hours before each sip feeding on study day
Digestion of the stable tracers of amino acid measured by plasma samples
In postabsorptive and prandial state every 20 minutes up to 8 hours before each sip feeding on study day

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Body Composition
Time Frame: on screening or study day 1
Body composition as measured by Dual-Energy X-ray Absorptiometry
on screening or study day 1
Respiratory muscle strength
Time Frame: on study day 1
determined by measurement of maximum breathing pressures
on study day 1
Skeletal muscle strength of hand
Time Frame: 30 minutes on screening or study day
measurement of handrip strenth
30 minutes on screening or study day
Skeletal muscle strength of leg
Time Frame: 30 minutes on screening or study day
measurement of muscle strength of leg using kin-com machine
30 minutes on screening or study day

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Texas A&M University

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Marielle P Engelen, PhD, Texas A&M University
  • Principal Investigator: Nicolaas E Deutz, PhD, Texas A&M University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
November 1, 2014

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
January 19, 2019

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
January 19, 2019

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 26, 2013

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 14, 2014

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
February 17, 2014

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
February 7, 2022

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 3, 2022

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
February 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2013-0758F

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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