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E-24 Free Communication/Poster - Body Composition Friday, May 30, 2014, 7:30 AM - 12:30 PM Room:WB1

Repeated Measures Segmental Body Composition Assessed by Bioelectrical Impedance and DXA in Overweight Latino Boys: 2337 Board #42 May 30, 930 AM - 1100 AM

Erceg, David N.; Anderson, Lindsey; Schroeder, E. Todd FACSM

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Medicine & Science in Sports & Exercise: May 2014 - Volume 46 - Issue 5S - p 624
doi: 10.1249/01.mss.0000495343.66141.43
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PURPOSE: This study aimed to assess the use of multifrequency bioelectrical impedance analysis (BIA) to accurately track changes in total lean mass (TLM) and segmental lean mass (SLM) over a 10wk period.

METHODS: TLM and SLM were assessed at week 0 and week 10 using the Biospace Inbody 520 BIA and dual energy x-ray absorptiometry (DXA) in 20 overweight Latino boys 8-10yrs of age, height 141±8cm, weight 51±17kg and BMI 25±6kg/m2. Two back-to-back BIA measurements were taken and averaged for analysis purposes. All assessments were conducted in the morning after an overnight fast.

RESULTS: A comparison of mean delta values (Δ = wk10 - wk0) for TLM revealed no significant (p=0.41) differences between BIA and DXA. Mean lean mass delta values for right and left arms, right and left legs, and the trunk increased for both methods and were not significantly different (p=0.16-0.88) between measurement methods. The correlation coefficient for left arm lean mass delta values was significant between methods (r=0.52; p=0.02). No significant correlations were found between methods for total lean mass changes (r=0.32; p=0.17) or lean mass changes in the trunk (r=0.04; p=0.86), right (r=0.08; p=0.75) and left (r=0.12; p=0.60) legs or right arm (r=0.42; p=0.07).

CONCLUSIONS: Mean delta values for TLM, trunk, legs, and arms were similar between BIA and DXA in overweight Latino boys suggesting that the Inbody 520 may be suitable for tracking group mean changes over time. However, the poor correlation between methods for delta values reveals significant differences between measurement methods questioning the validity of the Inbody 520 to accurately track individual changes.

© 2014 American College of Sports Medicine