Abstract
913 Body composition determination is difficult on individuals who are extremely obese (BMI≥40). Standard assessment methods are not feasible in most situations. A need exists to develop alternative methods for assessing body composition in this group. Subjects for the study included 444 men and women undergoing elective gastric bypass surgery for weight reduction. Body density was determined by hydrostatic weighing at residual volume, with percent fat calculated using the Siri formula. Circumference measurements were obtained on the right side and included: neck, waist, hip, thigh, calf, and ankle. Below are subject characteristics and regressions equations developed by forward selection of predictor variables. AAM=African American males; AAF=African American females; CM=Caucasian males; CF=Caucasian females. (Table)TableBased on these data, it appears that circumference measurements can be a reasonable alternative to hydrodensitometry for computing percent fat for extremely obese men and women. Supported by the North Carolina Institute of Nutrition
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