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A New Approach to Measuring Energy Expenditure in Humans

NCT01938794 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 72

Last updated 2019-10-09

No results posted yet for this study

Summary

Accurately measuring how many calories a person burns each day is difficult to do. Researchers can do this with a technique called doubly labeled water (DLW). This involves drinking water that is "labeled" with a non-radioactive tracer. After a few hours, the labeled water can be detected in the urine. To measure how many calories are burned (Total daily energy expenditure, TDEE), urine samples are collected several days apart. Although this technique is accurate, it is also challenging for two reasons. First, the labeled water is expensive. Second, the urine samples are analyzed using equipment (Isotope Ratio Mass Spectrometer, or IRMS) that is expensive and difficult to operate. The goal of this project is to develop a new instrument to perform DLW measurements of TDEE. This instrument, called a triple isotope water analyzer (TIWA) is less expensive and easier to operate than IRMS. Additionally, since the TIWA is more accurate than IRMS, it may potentially reduce the amount of labeled water required to measure TDEE, and thus reduce costs. The purpose of this study is to compare the accuracy of measuring TDEE from labeled water using the new instrument (TIWA) and from the traditional approach (IRMS). We will also compare the accuracy to the measurement of TDEE from whole-room indirect calorimetry (metabolic room), which is considered the most accurate way to measure TDEE.

Conditions

  • Human Energy Expenditure

Sponsors & Collaborators

  • National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

    collaborator NIH

  • University of Colorado, Denver

    lead OTHER

Principal Investigators

  • Edward L Melanson, PhD · University of Colorado, Denver

Eligibility

Min Age
18 Years
Max Age
99 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2013-09-30
Primary Completion
2017-08-31
Completion
2017-12-31

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01938794 on ClinicalTrials.gov