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COMPARISON OF MULTI-FREQUENCY BIOELECTRICAL IMPEDANCE ANALYSIS AND AIR DISPLACEMENT PLETHYSMOGRAPHY FOR ASSESSMENT OF BODY COMPOSITION

Abstract

C.J. Alfiero, M.C. Nelson, R.D. Midence, J.R. Ball, C.A. Vella, FACSM

University of Idaho, Moscow, ID

Multi-frequency bioelectrical impedance analysis (MF-BIA) is widely used for body composition assessment; however, few studies have assessed the accuracy of MF-BIA. PURPOSE: To examine the agreement between MF-BIA and air displacement plethysmography (BOD POD) for the assessment of body fat percentage (BF%), fat mass (FM) and fat free mass (FFM) in middle- and older-aged adults. METHODS: 28 women (age 52.4 ± 9.2 y; body mass index 25.7 ± 4.6 kg·m-2) and 15 men (age 50.1 ± 12.4 y; body mass index 25.5 ± 4.1 kg·m-2) participated in the study. BF%, FM and FFM were estimated using MF-BIA (InBody 770) and BOD POD. Agreement was assessed using intraclass correlation coefficients (ICC) and Bland-Altman analyses. One-sample t-tests and linear regressions were used to evaluate systematic and proportional bias, with limits of agreement defined as standard deviation multiplied by 1.96. RESULTS: ICC demonstrated there was a strong relationship between the methods for BF% (men ICC = 0.86; women ICC = 0.96), FM (men ICC = 0.94; women ICC = 0.99), and FFM (men ICC = 0.92; women ICC = 0.90, pCONCLUSION:Overall, there was acceptable agreement between MF-BIA and BOD POD for all body composition parameters. However, there was significant proportional bias, with differences between men and women. These findings indicate that MF-BIA may be a suitable alternative for assessment of body composition. Future research should utilize a larger sample size to confirm these results.

Supported by InBody USA.

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