Vinicius Nascimento-Ferreira, Marcus
De Moraes, Augusto Cesar F.
[3, 4, 7]
Barker, Alan R.
Moreno, Luis A.
[11, 3, 5]
 Univ Autonoma Chile, Fac Ciencias Salud, Talca - Chile
 Univ Granada, Fac Sport Sci, Dept Phys Educ & Sports, PROFITH PROmoting FITness & Hlth Phys Act Res Grp, Granada - Spain
Total Affiliations: 11
PEDIATRIC EXERCISE SCIENCE;
Web of Science Citations:
Purpose: To examine the intermethods agreement of dual-energy X-ray absorptiometry (DXA) and foot-to-foot bioelectrical impedance analysis (BIA) to assess the percentage of body fat (%BF) in young male athletes using air-displacement plethysmography (ADP) as the reference method. Methods: Standard measurement protocols were carried out in 104 athletes (40 swimmers, 37 footballers, and 27 cyclists, aged 12-14 y). Results: Age-adjusted %BF ADP and %BF BIA were significantly higher in swimmers than footballers. ADP correlates better with DXA than with BIA (r = .84 vs r = .60, P < .001). %BF was lower when measured by DXA and BIA than ADP (P < .001), and the bias was higher when comparing ADP versus BIA than ADP versus DXA. The intraclass correlation coefficients between DXA and ADP showed a good to excellent agreement (r = .67-.79), though it was poor when BIA was compared with ADP (r = .26-.49). The ranges of agreement were wider when comparing BIA with ADP than DXA with ADP. Conclusion: DXA and BIA seem to underestimate %BF in young male athletes compared with ADP. Furthermore, the bias significantly increases with %BF in the BIA measurements. At the individual level, BIA and DXA do not seem to predict % BF precisely compared with ADP in young athletic populations. (AU)