Physical Activity, Sedentary and Energy Consumption After Bariatric Surgery

The aim is

to examine the energy consumption before and after bariatric surgery. The study will contribute to the knowledge if operations should be complemented by interventions to increase energy expenditure, mainly by reducing sedentary.

as input for the design of an intervention to reduce sedentary. Such intervention should be based on knowledge of the mediators of physical activity among the subjects that need to be strengthened.

Hypothesis Patients who undergo bariatric surgery have before surgery low energy consumption related to physical activity. The investigators hypothesis is that low energy consumption for the most part retained and that is independent of whether one starts exercising or not.

About the level of physical activity and energy expenditure Increased physical activity after obesitasoperation is correlated with greater weight loss. According the Swedish Obesitas Surgery study, the percentage of persons who were classified as physically inactive decreased from 45% before surgery to less than 10% 6 months after surgery. The proportion of inactive people 6 years after surgery was 20%. Patients who undergo surgery for obesity has low energy consumption related to physical activity before surgery, as measured by pedometer or self-reported physical activity. The results in terms of increased physical activity after surgery are contradictory, where physical activity increases more in studies based on self-reported physical activity than in studies where measurements are made with the objective method. In a Swedish study (n = 56 women) no change could be seen in physical activity and sedentary after bariatric surgery. For a group of extremely obese (BMI around 50) were found reduced energy consumption by 25% after surgery. The decrease was related to lower body weight (average 53 kg) and thus decreased basal energy consumption and lower energy consumption during physical activity. A 20% decrease in body weight means an average of 400 kcal / day lower energy consumption.