While interdisciplinary weight loss intervention have been shown successful among adolescents with obesity, a weight regain is most of the time observed within the following weeks or months. The aim of the present project will be to better identify the independent role played by both the metabolic and mechanical load and their modification during weight loss, on the energy expenditure and energy metabolism of adolescents with obesity.
A total of 28 adolescents with obesity will be recruited from our local inpatient pediatric obesity centers. Before their weight loss intervention the adolescents will complete two experimental visits. During the first visit, anthropometric and body composition measurements will be performed. Then the participants will be asked to complete a walking exercise on a treadmill during the second visit. Their energy expenditure and substrate oxidation will be assessed by indirect calorimetry. They will have to walk at 5 different walking speeds. Then, they will follow a 12-week weight loss intervention. By the end of this intervention, their body composition will be assessed and they will be asked to perform the same walking exercise. On a separate occasion (randomly assigned) they will have to repeat this walking exercise while carrying a load corresponding of their weight loss.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
21
The adolescents will follow a 12-week intervention combining nutritional education, physical activity 3 times per week and psychological supports.
CHU clermont-ferrand
Clermont-Ferrand, France
Change in Energy Expenditure between before and after weight loss
amount of energy expended during the walking tests, measured using indirect calorimetry
Time frame: before and after the 12-week weight loss
change in lipid oxidation between before and after weight loss
amount of lipids oxidized during the walking tests, measured using indirect calorimetry
Time frame: before and after the 12-week weight loss
change in Fat mass between before and after weight loss
The amount of body fat will be assessed by dual energy X-ray absorptiometry
Time frame: before and after the 12-week weight loss
change physical activity preferences between before and after weight loss
Children will be asked to indicate their prefered physical activties and sedenatry behaviors on a computer task using visual analog scale (from 0 to 150 mm)
Time frame: before and after the 12-week weight loss intervention
Change in Energy Expenditure between the unloaded and loaded walking test
amount of energy expended during the walking tests, measured using indirect calorimetry
Time frame: after the 12_week weight loss
Change in lipid oxidation between the unloaded and loaded walking test
amount of lipids oxidized during the walking tests, measured using indirect calorimetry
Time frame: after the 12_week weight loss
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