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NCT02237872
The primary goal of this study is to assess the accuracy of conventional fat fraction proton MRI for the detection of Brown Adipose Tissue (BAT) in healthy subjects using \[18F\]-2-fluoro-2-deoxy-D-glucose (fluorodeoxyglucose) -PET as gold standard. In this pilot study, MRI and PET imaging of BAT of healthy adult volunteers will be performed on a combined PET/MRI scanner under mild cold condition.
NCT07048405
This clinical trial explores how repeated short-term cold exposure impacts the molecular and physiological function of brown adipose tissue (BAT), a thermogenic organ associated with improved cardiometabolic health. While intermittent cold exposure has been shown to increase BAT activity and mass, as measured by fluorodeoxyglucose (18F-FDG) uptake on positron emission tomography/computed tomography (PET/CT) scans, the molecular adaptations within BAT and other thermogenic tissues including skeletal muscle and white adipose tissue (WAT) remain poorly understood. Healthy adults aged 18 to 40 years (6 males and 6 females) will participate in a 10-day cold acclimation protocol (2 hours per day using water-perfused cooling blankets). The primary objective is to determine how cold exposure alters cellular heterogeneity and gene expression in BAT, WAT, and skeletal muscle. Participants will undergo baseline assessments, including measurements of energy expenditure, core and skin temperature, muscle activity, and blood sampling, each performed in both warm and cold conditions. These assessments will be followed by dynamic total-body PET/CT imaging during cold exposure and tissue biopsies from BAT, subcutaneous WAT, and skeletal muscle. These procedures will be repeated after the cold acclimation protocol to evaluate physiological and molecular changes. Additional outcomes include changes in energy expenditure, cold tolerance, and immune cell responses induced by cold exposure.
NCT06803069
Newborns have thermoregulatory mechanisms that differ from those of adults. Instead of producing heat through shivering, newborns primarily rely on non-shivering thermogenesis by the brown adipose tissue. The development of this thermogenic tissue starts around the 26th gestational week and continues until shortly before birth, after which no further growth occurs. As a result, premature infants, who have less developed brown fat, are more prone to reduced heat production and are at higher risk for hypothermia. There are few human studies examining the thermoregulatory differences and mechanisms between full-term and premature neonates, and the findings remain inconclusive. In this study, the investigators aim to conduct a prospective, observational research. Researchers will compare body temperature, brown adipose tissue activity, and specific plasma markers between full-term and premature neonates in insensive care units and during elective surgeries.
NCT02964442
Brown adipose tissue (BAT) thermogenesis can be assessed by IR thermography, the accompanying increase metabolic rate can be measured by whole body calorimetry and BAT volume can be precisely measured by MRI. The aim of the study is to validate IRT for BAT thermogenesis against the present gold standard 18-FDG-PET scan, quantify BAT volume by fat fraction MRI and measure the accompanying increase in BMR by whole body calorimetry among healthy euthyroid subjects.
NCT03490227
Up to 10 infants will complete the study aimed to establish a technique for measuring whole body adiposity and brown adipose tissue in infant subjects using dual energy x-ray absorptiometry and magnetic resonance imaging, respectively.
NCT04086381
Pre-clinical studies indicate that creatine may play a substantial role in diet-induced thermogenesis and may have a profound effect on energy balance. A recent retrospective study of BAT activation on PET-CT scans in humans showed a positive association with the estimated renal creatinine clearance and BAT activation, possibly linking creatine metabolism in humans to BAT activity. In humans, so far little options are available to activate brown adipose tissue. The most potent intervention to activate BAT is via cold, which has previously been shown to have metabolic effects in humans. Provided the potential health benefits of brown adipose tissue activation in humans, and provided the role of brown fat in diet induced thermogenesis, we here aim to determine whether creatine monohydrate supplementation can increase diet-induced thermogenesis and activate brown adipose tissue in humans.
NCT03269747
Interventional, Placebo controlled cross-over study to investigate the short-term effects of glucocorticoids (prednisone) on human brown adipose tissue.
NCT03096535
This study investigates cold-induced brown fat activation assessed using PET/MR scans. Subjects will participate in an acute cooling intervention day and a thermoneutral intervention day with PET/MR scans on both days. A secondary purpose is to make a validation of an infrared thermography camera by comparison of skin temperatures and SUV of the supraclavicular brown adipose tissue.