Masters Theses

Date of Award

8-2000

Degree Type

Thesis

Degree Name

Master of Science

Major

Human Performance and Sport Studies

Major Professor

Dixie Lee Thompson

Committee Members

David R. Barrett Jr., Edward T. Howley

Abstract

The main objective of this study was to assess the accuracy of the Tanita-TBF 305 foot-to-foot bioelectrical impedance analyzer for the estimation of body composition as compared to hydrostatic weighing. The secondary objective of this investigation was to access the impact of waist-to-hip ratio (WHR) on the estimation of body composition by the Tanita foot-to-foot analyzer. Participants were 40 pre-menopausal, obese females (39.7 ± 7.8 yrs; 46.5 ± 1.0% BF). In addition, the subjects were sub-divided based on WHR: 1) ≤ 0.75 lower body obesity (LBO); 2) ≥ 0.85 upper body obesity (UBO); 3) between 0.75 and 0.85 overall obese group. The results showed no significant differences in anthropometric characteristics between the sub-groups except for WHR (p < 0.0001). Estimation of body composition variables such as fat-free mass (FFM), fat mass (FM), and % body fat (BF) were obtained with the Tanita TBF-305 and hydrostatic weighing (HW). There were no significant differences for the total sample (n=40) in FFM, FM, or %BF between methods. Further, there was a significant correlation between HW and foot-to-foot BIA for FFM (r = 0.70), FM (r = 0.93), and %BF (r = 0.55) (p < 0.001). The standard error of the estimate for %BF was 5.6%. A repeated measures ANOVA showed no significant influence of body shape (i.e., WHR) on the prediction of %BF (p = 0.77). Correlation analysis revealed no relationship between WHR and the difference m %BF between methods (r = 0.03, p = 0.85) for the entire sample. In conclusion, the Tanita TBF-305 has the ability to accurately predict body composition m obese, pre-menopausal females. Furthermore, deviations in body shape (i.e., WHR) have no significant influence on the ability of the Tanita TBF-305 to estimate body composition.

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