Measuring Free-living Energy Expenditure Using Direct Calorimetry

Summary

Although instruments such as pedometers and heart rate monitors are helpful for those who use exercise to maintain their weight, they do not actually measure calories expended, which is a critical piece of information necessary for sustained weight management. The purpose of this study is to determine the accuracy of a new device that measures calories burned based upon heat produced by the body. Since heat production is directly proportional to calories burned, this device has the potential to accurately measure energy expended in many different settings.

Conditions

• Temperature
• Clothing
• Sex
• Age
• Adiposity

Interventions

BEHAVIORAL

Effects of Clothing

There will be two temperature conditions; warm temperature \[WT, 75°F (24°C)\] and cool temperature \[CT, 60°F (16°C)\]. During each condition, subjects will vary the amount of clothing they are wearing at specified times

BEHAVIORAL

Effects of Temperature

There will be two temperature conditions; warm temperature \[WT, 75°F (24°C)\] and cool temperature \[CT, 60°F (16°C)\]. During each condition, subjects will vary the amount of clothing they are wearing at specified times

BEHAVIORAL

Low Physical Activity

This will be a randomized study with two within subject conditions (high and low physical activity levels)

BEHAVIORAL

High Physical Activity

This will be a randomized study with two within subject conditions (high and low physical activity levels)

BEHAVIORAL

Direct calorimetry and doubly labeled water

TDEE will be measured simultaneously for 14 days using direct calorimetry and doubly labeled water. A heterogeneous sample of adult men and women in stable health will be studied.

Sponsors & Collaborators

• University of Alabama at Birmingham

  collaborator OTHER

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

  collaborator NIH

• University of Colorado, Denver

  lead OTHER

Principal Investigators

• Edward L Melanson, Ph.D. · University of Colorado, Denver

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2012-01-31

Primary Completion

2015-11-30

Completion

2016-01-31

Countries

• United States

Study Locations