Pedro Chung, Abigail Marmurowicz, Andre Canino, Keilah Vaughan, Gabe Wilner, Robert Buresh, FACSM, Cherilyn McLester, Brian Kliszczewicz, FACSM. Kennesaw State University, Kennesaw, GA.

Background: Body Composition is a known indicator of overall health and strongly related to metabolic function. Fat mass has been shown to influence glucose metabolism. However, less is known about lean mass. The purpose of this study was to evaluate several markers of body composition to an oral glucose tolerance test (OGTT). Methods: Ten (6 males, 4 females) healthy participants (ages 23±2 yrs), visited the lab on three separate occasions across 10 days. During each visit, body composition (BF%) via Bioelectrical Impedance Analysis (BIA), and hydration status via urine specific gravity (USG) were collected upon arrival. Next, participants underwent a two-hour OGTT consuming a 75g glucose (GLU) beverage. GLU measurements were taken via finger stick at baseline (PRE,) 30-min post, 1-hr post, and 2-hr post. Analyses were conducted with SPSS and alpha was set to 0.05. A repeated measures analysis of variance (RM ANOVA) and subsequent paired samples t-test were used to determine differences between time points. A two-tail Pearson correlation was used to determine relationships between our markers of interest. Results: Average body mass (77 ± 15 kg), BF% (22 ± 11%), and USG (1.023 ± 0.02). USG was correlated to PRE GLU (r = .491, p = .006). At 2-hr several indicators of body composition significantly correlated with glucose levels; dry lean mass (r = -.488, p = .007), fat mass (r = .493, p = .007), total body water (r = -.479, p = .009), and BF % (r = .541, p = .002). A Post Hoc Partial correlation controlling for FM and dry lean mass revealed that significance was not lost for either variable. Conclusions: The primary finding of this study suggest that both fat mass and lean mass are independently influential on rebounding GLU. These findings indicate that maintenance or increase of lean mass is just as important as reduction in fat mass for GLU regulation.

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