Cold Induced Activation of Brown Adipose Tissue in Winter Swimmers (NCT03095846) | Clinical Trial Compass
CompletedNot Applicable
Cold Induced Activation of Brown Adipose Tissue in Winter Swimmers
Denmark15 participantsStarted 2017-04-02
Plain-language summary
This study investigates cold-induced brown fat activation in winter swimmers and not-winter swimmers by skin temperature measures assessed with infra red thermography imaging and skin temperatures. Winter swimmers and not-winter swimmers will participate in an acute cooling intervention and thermoneutral intervention for comparison of energy expenditure and skin temperatures at the supraclavicular area.
Who can participate
Age range18 Years – 35 Years
SexMALE
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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 d…
What they're measuring
1
5. Difference in brown adipose tissue (BAT) activity after cooling between Winter Swimmers (WS) and No-Winter Swimmers (NWS).
Timeframe: Difference in peak temperature after 2 hours of cooling.