- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03095846
Cold Induced Activation of Brown Adipose Tissue in Winter Swimmers (COLDBAT_WS)
Cold Induced Activation of Brown Fat in Winter Swimmers
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The field of human brown adipose tissue (BAT) research is focused on activation of BAT as a means of manipulating energy expenditure and potentially anti-obesity and anti-diabetic properties of the tissue. This is well established in rodent studies and explained as due to the specific brown fat uncoupling protein 1 (UCP1). Despite increasing evidence that indicates a metabolic regulatory role of BAT in humans, BAT activation/recruitment is not fully understood.
Cold induced brown fat activity will be measured by skin temperature measures by means of infra-red thermography imaging and skin temperature.
15 healthy male winter swimmers and 8 healthy male non-winter swimmers (controls) will be included in the study.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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Copenhagen, Denmark, 2100
- Center for Inflammation and Metabolism/ Center for Physical Activity Research
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
Age 18-35 years. Men Caucasian white Body Mass Index 19-25 kg/m2. Moderate physical activity level (not more than 8-10 hours of training pr. Week) Ability to give informed consent. Ability to follow verbal and written instructions in Danish. Body fat percent under 21% measured at the pre-examination day. Winter swimmers: Min. 2 swim/ week. Swimming in winter-season in open water outdoor in Denmark from September/October until study start in March.
Not-winter swimmers: Not winter-swimmers or taken cold showers on a regular basis.
Exclusion Criteria:
- Chronic diseases: Hormonal: Metabolic Diseases mb. Graves, hypothyroidism, myxedema and goiter. Diabetes Melitus, Coronary heart disease (history of myocardial infarction, unstable angina pectoris, or congestive heart failure), cancer treated within last 3 years.
Tobacco, marijuana or intravenous drug use within 1 year of screening. Dieting, recent weight loss (>3 kg within 3 month) or a history of an eating disorder.
Dietary supplements. History of depression, psychosis, or other psychiatric illness requiring hospitalization.
Alcohol consumption >14 units/week. History of alcohol abuse within the past 3 years. Known liver disease or elevated liver biomarkers more than 2 times upper normal levels in the preliminary investigation.
Known kidney disease or elevated kidney biomarkers, in the preliminary investigation.
Use of daily medications, except for seasonal use of antihistamines. Diagnosed sleep disturbances.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Non-Randomized
- Interventional Model: Factorial Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Experimental: Winter Swimmers
Individualized cooling protocol
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Individualized cooling protocol
Other Names:
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Experimental: Not-winter Swimmers
Individualized cooling protocol
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Individualized cooling protocol
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
5. Difference in brown adipose tissue (BAT) activity after cooling between Winter Swimmers (WS) and No-Winter Swimmers (NWS).
Time Frame: Difference in peak temperature after 2 hours of cooling.
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BAT activity is measured by skin temperature in the supraclavicular BAT depot using infrared thermography imaging.
Difference between peak temperature change (peak temperature minus baseline temperature) during 2 hours of cooling is calculated.
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Difference in peak temperature after 2 hours of cooling.
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Difference in glucose control between WS and NWS.
Time Frame: Difference in glucose control between WS and NWS after a 2 hours glucose tolerance test under thermoneutral conditions.
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Difference in glucose control between WS and NWS in an oral glucose tolerance test measured as incremental area under the curve (iAUC).
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Difference in glucose control between WS and NWS after a 2 hours glucose tolerance test under thermoneutral conditions.
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Difference in resting energy expenditure after cooling versus no cooling
Time Frame: Difference in resting energy expenditure after 2 hours of cooling versus 2 hours of no cooling.
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Difference in resting energy expenditure after cooling versus no cooling between WS and NWS measured as mean difference in kilojoule per minute.
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Difference in resting energy expenditure after 2 hours of cooling versus 2 hours of no cooling.
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Susanna Søberg, MSc., Center for Inflammation and Metabolism/Center for physical activity research
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- H-16038581-COLDBAT_WS
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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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