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COMPARED TO DXA, BIA UNDERESTIMATES BODY FAT IN MALE AND FEMALE COLLEGIATE BASKETBALL PLAYERS

Abstract

Body composition can be assessed by various methods, including dual-energy x-ray absorptiometry (DXA) and bioelectrical impedance analysis (BIA). While DXA is considered the current criterion method, due to its accuracy and reliability, each method has different margins of error, and sources of error may differ across athletes by gender. Thus, it is important to understand differences in methods for male and female athletes. PURPOSE: To compare body fat percentage (%BF) estimates between DXA and BIA for male and female division I collegiate basketball players. METHODS: The sample (n=303) of NCAA division I college basketball players included males (n=219) and females (n=84) who underwent body composition testing using BIA and DXA. Data were analyzed by paired-samples t-tests to assess differences in %BF estimates between DXA and BIA for the combined sample, as well as differences between DXA and BIA for males and females, respectively. RESULTS: There was a significant difference between DXA and BIA for the combined sample, with significantly lower %BF measured by BIA vs. DXA (BIA = 15.11 ± 0.37%; DXA = 20.11 ± 0.43%; p

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