Purpose Bariatric surgery is considered as an effective therapeutic strategy for weight loss in severe obesity. Remission of type 2 diabetes is often achieved following the surgery. We investigated whether increase in self-reported habitual physical activity associates with improved skeletal muscle insulin sensitivity and reduction of fat depots after bariatric surgery. Methods We assessed self-reported habitual physical activity using Baecke questionnaire in 18 diabetic and 28 non-diabetic patients with morbid obesity (median age 46 years and BMI 42.0 kg·m-2) before and six months after bariatric surgery operation. Insulin-stimulated femoral muscle glucose uptake was measured using FDG PET -method during hyperinsulinaemia. In addition, abdominal subcutaneous and visceral fat masses were quantified using magnetic resonance imaging and liver fat content using magnetic resonance spectroscopy. Also, serum pro-inflammatory cytokines were measured. Results Patients lost on average 22.9% of weight during the follow-up period of six months (p
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