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Sponsored by: |
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) |
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Information provided by: | National Institutes of Health Clinical Center (CC) |
ClinicalTrials.gov Identifier: | NCT00266500 |
This study will investigate how different parts of the body lose body heat and will measure the heat released by specific areas such as the limbs and abdomen. Animal studies suggest that dissipation of body heat may affect energy expenditure, and therefore, body weight. This study will explore the relationship between obesity and heat in humans.
Healthy people 18 years of age and older who are of normal weight or who are obese and who are not taking medications for obesity-related medical conditions may be eligible for this study. Candidates must have a body mass index (BMI) between 18 and 25 kg/m2 for normal weight subjects or a BMI greater than 30 kg/m2 for obese subjects. All candidates must weigh less than 300 pounds. Women must have a normal menstrual cycle or be postmenopausal.
Participants undergo the following procedures in a single day on an outpatient basis:
Participants who qualify for the second part of the study undergo the following procedures during a 5-day in-hospital stay:
Condition |
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Obesity |
Study Type: | Observational |
Official Title: | Body Heat Content and Dissipation in Obese and Normal Weight Adults |
Estimated Enrollment: | 150 |
Study Start Date: | December 2005 |
Animal models suggest that dissipation of body heat is an important physiological process that may affect energy expenditure, and thus may possibly modulate body weight. It is unknown, however, if deficient dissipation of heat can contribute to human obesity, or if obesity induces deficits in heat dissipation, and the relationship between obesity and heat in humans is largely unexplored.
We propose to study obese (BMI greater than or equal to 30 kg/m(2)) and normal weight (BMI less than or equal to 25 kg/m(2)) adults to determine possible obesity-related differences in: 1) regional body temperature heterogeneity (i.e., presence of localized areas of heat retention), 2) the extent to which locally retained heat may be co-localized with deep fat depots, 3) the effectiveness of specific body loci (e.g., the distal extremities) as dissipaters of heat, and 4) the ability of approaches that alter heat dissipation to modify deep-body temperature heterogeneity.
It is hoped that the results of this study will provide preliminary evidence for future studies that attempt to facilitate weight loss in obese subjects through effective, guided applications of heat management.
Ages Eligible for Study: | 18 Years to 70 Years |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
Volunteers will qualify if they meet the following criteria:
EXCLUSION CRITERIA (Overweight Subjects):
Volunteers will be excluded (and referred to treatment as needed) for the following reasons:
Contact: Patient Recruitment and Public Liaison Office | (800) 411-1222 | prpl@mail.cc.nih.gov |
Contact: TTY | 1-866-411-1010 |
United States, Maryland | |
National Institutes of Health Clinical Center, 9000 Rockville Pike | Recruiting |
Bethesda, Maryland, United States, 20892 |
Study ID Numbers: | 060038, 06-CH-0038 |
Study First Received: | December 16, 2005 |
Last Updated: | November 4, 2008 |
ClinicalTrials.gov Identifier: | NCT00266500 |
Health Authority: | United States: Federal Government |
Adipose Tissue Weight Gain Overweight Thermogenesis Deep Body Temperature |
Adult Exercise Weight Gain Overweight |
Body Weight Signs and Symptoms Obesity Nutrition Disorders |
Overnutrition Overweight Weight Gain |