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Comparison of Leg-to-Leg Bioimpedance (BIA) System with Dual Energy X-ray Absorptiometry (DXA) in an Elderly Cohort

 

Practical Implications:

  • These results suggest that the Tanita leg-to-leg system reliably predicts body fat in elderly subjects
  • The mean % fat estimates by Tanita BIA and DXA were not significantly different.  Linear regression demonstrated a high correlation between Tanita BIA and DXA fat estimates (r=0.90, p<0.001)

ABSTRACT

Objective: 

Prior studies support the use of BIA in assessing healthy adult body composition. As there are recognized age-related body composition and physiological changes that alter tissue conduction, concern arises for BIA validity in the elderly.  The present study evaluated the validity of a leg-to-leg contact electrode BIA system (TBF-305, Tanita Corp., Tokyo, Japan) in an elderly cohort by comparing BIA fat estimates with those by DXA.

Design:

There were 74 subjects with mean age 64 yrs. and BMI (26.6±4.8 kg/m²) who successfully completed protocol.

Results:

The mean % fat estimates by BIA (32.8±9.5) and DXA (33.7±9.9) were not significantly different (p=0.58). Linear regression demonstrated a high correlation between BIA and DXA fat estimates (r=0.9, p<0.001, SEE=4.4). The slope and intercept of the regression line were not significantly different from 1 and zero, respectively. These results suggest that the leg-to-leg BIA system reliably predicts body fat in elderly subjects.

*Reprinted from Tanita Corporation of America, Inc.


Source: F. Rubiano,m C. Nuñez, D. Gallagher & S.B. Heymsfield
Obesity Research Center, St. Luke's/Roosevelt Hospital, Columbia University, NY, NY
First presented at Experimental Biology 1999 "Poster"

 

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