Document Type

Thesis

Date of Degree Completion

Spring 2008

Degree Name

Bachelor of Science

Committee Chair

Dr. David L. Gee

Second Committee Member

Dr. Cen-Tsong Lin

Third Committee Member

Dr. Andrew A. Piacsek, Science Honors Research Program

Abstract

Bioelectrical impedance analysis (BIA) is widely used in predicting body composition. Impedance of an electrical current that passes through the body is related to the composition of the body and the length of the conductor, conventionally estimated using height. The purpose of this study was to compare a BIA equation prediction fat-free mass (FFM) that utilized actual conductor length (Parsons) with a conventional BIA equation (NHANES), using hydrodensitometry as the reference method. Thirty-nine male and 53 female subjects were studied. For both sexes, FFM predicted by both Parsons and NHANES equations were equally and highly correlated with FFM measured using hydrodensitometry (r = 0.88 to 0.91 ). For males, both equations had equal precision in predicting FFM (R2 (Parsons) = 0.711, R2 (NHANES) = 0.718). However, for females, FFM predicted with the Parsons equation had a much higher precision than FFM predicted with the NHANES equation (R2 (Parsons)= 0.771 and R2 (NHANES) = 0.578, respectively). These results suggest that using conductor length in BIA equations may result in more precise predictions of FFM for females.

Comments

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