In the recent years, research on brown adipose tissue (BAT) revealed that larger amounts as well as higher activity thereof are associated with a favourable metabolic phenotype. Longitudinal studies which applied recurrent cooling sessions demonstrated a high plasticity of BAT which significantly increased in size and activity during these studies. These changes were accompanied by improvements in body fat mass as well as insulin sensitivity. Non-alcoholic fatty liver disease (NAFLD) is estimated to advance to the primary cause of liver cirrhosis and hepatocellular carcinoma in the following years. Besides predisposing genetic and possibly nutritional factors, the insulin resistance syndrome and obesity are the main factors contributing to this excessive hepatic lipid accumulation. The aim of this study is to investigate whether BAT recruitment via cold-acclimation results in decreased hepatic lipid content in overweight/obese patients with NAFLD.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
SINGLE
Enrollment
26
Two hours of mild cold exposure using a water-perfused vest
Medical University of Vienna
Vienna, Austria
RECRUITINGHepatic lipid content (%)
Magnetic resonance imaging-proton density fat fraction
Time frame: Six weeks
Brown adipose tissue volume (ml) / activity (SUVmean)
18-fluorodeoxyglucose positron emission tomography/ magnetic resonance imaging
Time frame: Six weeks
Basal metabolic rate (kcal/day/kg fat-free body mass)
Indirect calorimetry
Time frame: Six weeks
Cold-induced non-shivering thermogenesis (%)
Indirect calorimetry: percentage increase in basal metabolic rate before and after cold exposure
Time frame: Six weeks
Body fat mass (kg)
Air displacement plethysmography
Time frame: Six weeks
Insulin sensitivity
"Matsuda Index" for 2 hour standard oral glucose tolerance test
Time frame: Six weeks
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