Med Biol Eng Comput - Comparison of body fat-free masses calculated from hand-to-foot and foot-to-foot resistances with DXA measurements.


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This article compares the determination of body fat-free-mass (FFM) by impedance, using either hand-to-foot resistance (R13) or foot-to-foot one (R34) from comparison with dual X-ray absorptiometry (DXA) measurements in a normal population. The first goal was to see if the foot-to-foot resistance used in body fat analysers provides less accurate information for body FFM than the hand-to-foot one used by medical impedance-meters. Another goal was to compare the prediction accuracy of six different regression equations of FFM for each sex and for each resistance relatively to DXA. The impedancemeter used in this study was a Tefal prototype with 4 plantar electrodes and 4 additional electrodes for the hands and providing hand-to-foot and foot-to-foot resistances. Coefficients of these correlations were determined by comparison with FFM measured by DXA in a 1st cohort of 170 healthy adults. For an independent validation, these equations were tested in a 2nd cohort of 86 adults who underwent the same impedance and DXA protocols, using Student's paired t-tests. The accuracy of FFM prediction increased generally with the number of physiologic parameters included in the regression, but none of our equations gave FFM predictions significantly different from DXA. FFM calculated from the foot-to-foot resistance were closer to DXA values than those calculated from hand-to-foot resistance, as their average P-value of comparison with DXA was higher at 0.695 against 0.387 for R13.

Resumo Limpo

articl compar determin bodi fatfreemass ffm imped use either handtofoot resist r foottofoot one r comparison dual xray absorptiometri dxa measur normal popul first goal see foottofoot resist use bodi fat analys provid less accur inform bodi ffm handtofoot one use medic impedancemet anoth goal compar predict accuraci six differ regress equat ffm sex resist relat dxa impedancemet use studi tefal prototyp plantar electrod addit electrod hand provid handtofoot foottofoot resist coeffici correl determin comparison ffm measur dxa st cohort healthi adult independ valid equat test nd cohort adult underw imped dxa protocol use student pair ttest accuraci ffm predict increas general number physiolog paramet includ regress none equat gave ffm predict signific differ dxa ffm calcul foottofoot resist closer dxa valu calcul handtofoot resist averag pvalu comparison dxa higher r

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