This is a continuing renewal application to follow this cohort at 5 to 7 years post-surgery. Important unanswered questions surround the long-term nature of body composition and resting energy expenditure (REE) after substantial and sustained weight loss by severely obese persons. This ancillary study cohort from LABS has been uniquely and comprehensively characterized for body composition and REE at T0 (before surgery), T12 (12 months post-surgery), and T24 (24 months post-surgery);therefore, it is well suited for further study of these same questions at ~T60 and T84 in that: they underwent massive weight loss;the weight loss was sustained at 24 months and is likely to be sustained over a long period of time thereby allowing for an investigation of whether adaptations of organ/tissue mass and fat redistribution occur;and REE relative to FFM at T24 continues to be lower compared to pre-surgery levels which is largely due to ongoing changes in organ mass. We propose to examine body composition and REE at the organ-tissue level at two additional time points, 60 months (T60) and 84 months (T84) post-surgery. We will continue to analyze the composition of body weight using the same advanced body composition models and measurement methods. 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). Consenting, eligible LABS patients previously enrolled in this ancillary study from Weill Cornell and the University of Pittsburgh will undergo the following measures: total body water by deuterium dilution (fat and FFM), extracellular water by sodium bromide tracer, body density by the BodPod, whole-body MRI (adipose tissue and its distribution;skeletal muscle mass;mass of liver, kidneys, heart, and brain), dual energy-X-ray absorptiometry (femur BMD, total body fat, fat-free mass, and bone mineral content), and REE. Subjects will be a women and men (n=100) equally distributed between the New York and Pittsburgh sites.
This competing renewal will contribute to scientific knowledge by determining whether post-bariatric surgery patients'body compartments stabilize or continue to change in the presence of weight stability or weight regain at 60 to 84 months post-surgery, and whether body compartments and REE at each timepoint are similar to non-surgery, weight stable matched archived controls. If specific body compartments are found to be in a continuing state of flux at T60 and/or T84, (e.g., ongoing losses of SM and bone;potentially increasing ectopic fat depots;and a lower REE relative to FFM with weight regain), this would have important implications for how post-bariatric surgery patients should be treated. At present, there is a dearth of evidence-based advice relating to long-term post-surgery treatment.
| Davidson, Lance E; Yu, Wen; Goodpaster, Bret H et al. (2018) Fat-Free Mass and Skeletal Muscle Mass Five Years After Bariatric Surgery. Obesity (Silver Spring) 26:1130-1136 |
| Strain, Gladys Witt; Ebel, Faith; Honohan, Jamie et al. (2017) Fat-free mass is not lower 24 months postbariatric surgery than nonoperated matched controls. Surg Obes Relat Dis 13:65-69 |
| Lemos, Thaisa; Gallagher, Dympna (2017) Current body composition measurement techniques. Curr Opin Endocrinol Diabetes Obes 24:310-314 |
| Toro-Ramos, Tatiana; Goodpaster, Bret H; Janumala, Isaiah et al. (2015) Continued loss in visceral and intermuscular adipose tissue in weight-stable women following bariatric surgery. Obesity (Silver Spring) 23:62-9 |
| Widen, Elizabeth M; Strain, Gladys; King, Wendy C et al. (2014) Validity of bioelectrical impedance analysis for measuring changes in body water and percent fat after bariatric surgery. Obes Surg 24:847-54 |
| Hames, Kazanna C; Anthony, Steven J; Thornton, John C et al. (2014) Body composition analysis by air displacement plethysmography in normal weight to extremely obese adults. Obesity (Silver Spring) 22:1078-84 |
| Baracos, Vickie; Caserotti, Paolo; Earthman, Carrie P et al. (2012) Advances in the science and application of body composition measurement. JPEN J Parenter Enteral Nutr 36:96-107 |
| Gallagher, Dympna; DeLegge, Mark (2011) Body composition (sarcopenia) in obese patients: implications for care in the intensive care unit. JPEN J Parenter Enteral Nutr 35:21S-8S |
| He, Qing; Heshka, Stanley; Albu, Jeanine et al. (2009) Smaller organ mass with greater age, except for heart. J Appl Physiol (1985) 106:1780-4 |
| Lee, Seon Yeong; Gallagher, Dympna (2008) Assessment methods in human body composition. Curr Opin Clin Nutr Metab Care 11:566-72 |
Showing the most recent 10 out of 12 publications
