Weight Change, Weight Loss
Conditions
Keywords
body composition, weight loss, fat, fat distribution, fat free mass, organ, resting energy expenditure
Brief summary
The aim of this study is to measure important components of weight change in patients who underwent bariatric surgery on measures of fat mass and its distribution and fat-free mass (FFM) (bone mineral density, skeletal muscle, and specific organs) at 60 months (T60) and 84 months (T84) post-surgery, and to compare compartment sizes with stable weight controls.
Detailed description
Consenting, eligible patients previously enrolled in the ancillary study, Longitudinal Assessment of Bariatric Surgery (LABS), from Weill Cornell and the University of Pittsburgh will undergo the following measures: total body water by deuterium dilution (fat and fat-free mass (FFM)), extracellular water by sodium bromide tracer, body density by the BodPod, whole-body magnetic resonance imaging (MRI) (adipose tissue and its distribution; skeletal muscle mass; mass of liver, kidneys, heart, and brain), dual energy-X-ray absorptiometry (femur bone mineral density (BMD), total body fat, fat-free mass, and bone mineral content), and resting energy expenditure (REE). MRI will describe body composition changes at the tissue/organ level and adipose tissue distribution allowing us to address questions of biological and clinical importance including the body composition changes' influences on REE. The specific aims are to: 1) measure important components of weight change in patients who underwent bariatric surgery on measures of fat mass and its distribution and FFM (including bone mineral density, skeletal muscle, and specific organs) at T60 and T84 months following surgery, and also to compare compartment sizes with those seen in stable weight controls; 2) measure the amount of change in REE at T60 and T84 compared to T0, following weight loss induced by bariatric surgery and to determine its relation to changes in body composition compartments, and its duration over the follow-up period. Secondary research questions relate to changes in cardiac structure and function, physical activity associations with skeletal muscle changes, and adipose tissue depot changes as predictors of cardiometabolic parameters (glucose metabolism and serum lipid composition). Subjects will be women and men (n=100) equally distributed between the New York and Pittsburgh sites.
Interventions
OTHERFollow-up post-bariatric surgery
Follow-up of those subjects who had bariatric surgery (as part of the parent LABS trial) immediately following the collection of baseline measures (body composition) in this study. Follow-up body composition measures will be acquired at 60 months and 84 months post-baseline measures (post-surgery).
Sponsors
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
University of Pittsburgh
Columbia University
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Had to have been enrolled in the ancillary study prior to having bariatric surgery * Are able to come to the laboratory for testing.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Fat and fat-free mass | Approximately 60 months and 84 months post-bariatric surgery |
Secondary
| Measure | Time frame |
|---|---|
| Adipose tissue distribution | Approximately 60 months and 84 months post-bariatric surgery |
Other
| Measure | Time frame |
|---|---|
| Resting energy expenditure | Approximately 60 months and 84 months post-bariatric surgery |
Countries
United States
Outcome results
None listed