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Asian J Sports Med. 2012 September; 3(3): 200–203.
PMCID: PMC3445648

The Estimation of the Fat Free Mass Index in Athletes

Jeremy P. Loenneke, MSc,1,2,3,4,5,* Jacob M. Wilson, PhD,1,2,3,4,5 Mandy E. Wray, MSc,1,2,3,4,5 Jeremy T. Barnes, PhD,1,2,3,4,5 Monica L. Kearney, MS,1,2,3,4,5 and Thomas J. Pujol, EdD1,2,3,4,5



The purpose of this investigation was to compare a practical measurement of fat free mass index (FFMI) from bioelectrical impedance analysis (BIA) to the dual energy X-ray absorptiometry (DEXA) value in collegiate athletes.


Thirty-three male baseball players and 16 female gymnasts volunteered to participate in this study during their respective pre-season. Subjects visited the laboratory once and had their measurements taken in the following order: weight, height, DEXA, and Omron HBF-500.


The BIA device investigated was not a valid estimate of FFMI when compared to the DEXA. The TE was 0.93 kg/ m2 for males and 0.78 kg/ m2 for females. There were also significant mean differences between the BIA prediction and the DEXA value for males (BIA=20.6 kg/m2 vs. DEXA=21.1 kg/m2, P=0.007) and females (BIA=16.2 kg/m2 vs. DEXA=17.5 kg/m2, P=0.001).


The BIA device investigated in this study did not provide a valid estimate of FFMI in male and female collegiate athletes. Although there was a general tendency for the BIA to underestimate FFMI compared to DEXA, 98% of the estimates were within plus or minus 2 kg/ m2. Therefore, while slightly biased, BIA may provide a reasonable (± 2 kg/ m2) estimate of nutritional status for practitioners who are unable able to afford more expensive equipment.

Keywords: Body Mass Index, Body Fat, Sports, Fat Free Mass, Dual Energy X-ray Absorptiometry, DEXA Scan

Articles from Asian Journal of Sports Medicine are provided here courtesy of Kowsar Medical Institute