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• W2953588086 abstract "G.M. Frederick1, B.M. Das2, M.V. Fedewa3, R.M. Reed1, R.E. Salyer1, M.D. Schmidt1, E.M. Evans1, FACSM. 1University of Georgia, Athens, GA 30602. 2East Carolina University, Greenville, NC 27858. 3University of Alabama, Tuscaloosa, AL 35487. PURPOSE: Body mass index (BMI) is often used as a surrogate measure of adiposity (%Fat). It is well-established that physical activity (PA) influences body composition. In addition to the well-established sex differences in body composition, college-age males also typically engage in more PA than their female counterparts. This difference in PA could potentially impact the relationship between BMI and %Fat. Therefore, the aim of this study was to determine if PA differentially influences the relationship between BMI and %Fat in college-age males compared to females. METHODS: BMI was calculated from weight and height measured using standard clinical protocols. PA was measured in steps/day using the NL-1000 accelerometer. %Fat was measured via DEXA. RESULTS: Males (N = 124; 18.4 ± 0.5 yrs, 23.2 kg/m2) and females (N = 282; 18.3 ± 0.5 yrs, 23.0 kg/m2) were nearly identical in age and BMI (both p > 0.05). As expected, males were leaner (18.4 ± 5.1 %Fat vs. 32.2 ± 5.7 %Fat, p < 0.001) and accumulated more PA (11,625 ± 2930 vs. 10,866 ± 3467 steps/day, p = 0.03) compared to females. Because of the known sex difference in %Fat, separate linear regression models were evaluated to explore the prediction of %Fat from BMI, PA, and BMI x PA. BMI explained 50.2% of the variance in %Fat among females and only 18.3% of the variance in males (p < 0.001 for both). Adding PA to the model significantly increased the variance in %Fat explained in both females and males (∆R2 = 3.4% and 3.5%, respectively, both p < 0.05). The addition of the BMI x PA interaction term improved the model in females (∆R2 = 1.3%, p = 0.005), but not males (∆R2 = 0.0 %, p = 0.933). CONCLUSION: Weight management is of high public health importance, especially for young adults who have an increasing risk for obesity during this stage of life. While many health promotion efforts focus on weight management with BMI as a primary outcome, it is important to account for sex differences with respect to the relationships among BMI, PA, and %Fat when using BMI for program evaluation in the young adult population." @default.
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• W2953588086 date "2019-06-01" @default.
• W2953588086 modified "2023-09-27" @default.
• W2953588086 title "Physical Activity Influences the Relationship between BMI and Adiposity Differently in College Males and Females" @default.
• W2953588086 doi "https://doi.org/10.1249/01.mss.0000562779.08545.67" @default.
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