Abstract
The purpose of the present study was to determine the validity of near-infrared interactance (NIR) and bioelectrical impedance (BIA) instruments for estimating percent body fat (%fat) in young female swimmers. Fifty-three female, age-group swimmers ([horizontal bar over]X age±SD=11.7 ± 3.0 yrs) volunteered to have their% fat estimated by underwater weighing(UWW), a Futrex-5000A NIR instrument, and an RJL Systems BIA-106 Spectrum analyzer. The cross-validation procedures used to compare estimated% fat values from NIR and BIA to criterion% fat from UWW included the constant error(CE), validity coefficient (r), standard error of estimate (SEE), and total error (TE). Table The findings from the present study indicated that the NIR (TE=6.6% fat), and BIA (TE=6.7% fat) instruments resulted in TE values that were too large to be of practical value. Thus, the NIR and BIA instruments used in the present study are not recommended for estimating% fat in young female swimmers.
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