Development of a dual-energy X-ray absorptiometry-derived body volume equation in Hispanic adults for administering a four-compartment model

摘要

The purpose of the present study was: (1) to develop a new dual-energy X-ray absorptiometry (DXA)-derived body volume (BV) equation with the GE-Lunar prodigy while utilising underwater weighing (UWW) as a criterion and (2) to cross-validate the novel DXA-derived BV equation (4C-DXA(Nickerson)), Wilson DXA-derived BV equation (4C-DXA(Wilson)) and air displacement plethysmography (ADP)-derived BV (4C-ADP) in Hispanic adults. A total of 191 Hispanic adults (18-45 years) participated in the present study. The development sample consisted of 120 females and males (50 % females), whereas the cross-validation sample comprised of forty-one females and thirty males (n 71). Criterion body fat percentage (BF %) and fat-free mass (FFM) were determined using a four-compartment (4C) model with UWW as a criterion for BV (4C-UWW). 4C-DXA(Nickerson), 4C-DXA(Wilson) and 4C-ADP were compared against 4C-UWW in the cross-validation sample. 4C-DXA(Nickerson), 4C-DXA(Wilson) and 4C-ADP all produced similar validity statistics when compared with 4C-UWW in Hispanic males (all P > 0 center dot 05). 4C-DXA(Nickerson) also yielded similar BF % and FFM values as 4C-UWW when evaluating the mean differences (constant error (CE)) in Hispanic females (CE = -0 center dot 79 % and 0 center dot 38 kg; P = 0 center dot 060 and 0 center dot 174, respectively). However, 4C-DXA(Wilson) produced significantly different BF % and FFM values (CE = 3 center dot 22 % and -2 center dot 20 kg, respectively; both P < 0 center dot 001). Additionally, 4C-DXA(Wilson) yielded significant proportional bias when estimating BF % (P < 0 center dot 001), whereas 4C-ADP produced significant proportional bias for BF % and FFM (both P < 0 center dot 05) when evaluated in Hispanic females. The present study findings demonstrate that 4C-DXA(Nickerson) is a valid measure of BV in Hispanics and is recommended for use in clinics, where DXA is the main body composition assessment technique.