Validação da absortometria de raio-X de dupla energia para estimativa da gordura corporal relativa de adultos jovens

Resumo (EN)

Objective – The purpose of this study was to verify the cross-validation of the double energy’s x-ray absorptiometry (DEXA) in the relative body fat’s estimate in 37 young adults men from about 18 to 32 years old, based in the use of hydrostatic weighing (HW) in order to find measures that can be used as reference of the relative body fat (%BF). Methods – The Lohman’s suggestion were followed in the crossed validity’s analysis through the computation of the linear correlation coefficient of Pearson (r), paired “T” test, constant error (CE), total error (TE) and standard error estimation (SEE). Moreover, was made the residual results’ analysis. The point of cut adopted for the SEE was of 2,0%. The statistic significance was p < 0,05. Results – The CE value -1,00 is considered low. The SEE value 1,86% did not trespassed the cut base of 2%, however, the TE value overcame the SEE ones which shows that DEXA was not a stronger predictor of %BF. From the residual results’ analysis, 32,4% overestimate and 21,62% is underestimate when the %BFDEXA is compared with the %BFHW. Conclusion – The tendency line was in the negative zone, confirming the tendency of the DEXA in overestimate the %BF. DEXA does not have a crossed validity in the %BF estimate with the HW as a standard.