Study on association and consistence of body composition measured by different methods

ObjectiveTo determine the associaton and agreement of anthropometric variables.BIA and DXA indicators of body composition in children and adolescents.MethodsBody composition was measured by anthropometry,bioelectrical impedance analysis(BIA)and dual-energy X-ray absorptiometry(DXA)(criterion method)in 62 children and adolescents aged 8-15.ResultsBody compositon measured by the three methods was positively associated with BMI(r=0.700～0.816).Waist circumstance,hip circumstance and abdominal skinfold thickness were positively associated with trunk fat mass and trunk percent fat mass measured by DXA(r=0.847,0.726,0.885).There exited strong association between SF-based equation and DXA and between BIA and DXA,yet SF-based equation underestimated PBF in most individuals and BIA underestimated PBF under diference fat mass levels.ConclusionThe utility of waist circumstance for the measurement of central fat distribution.PBF measured by SF-based equation and BIA underestimated actual PBF to some extent,and showed poor agreement with DXA.Large samples should be required to confirm fuarther validation.