Abstract
Dual-energy X-ray absorptiometry (DXA) is one of the most accurate methods to measure body composition, and it has been widely used in both clinical and research settings such as the Appendicular Lean Mass (ALM) in sarcopenia. The body composition results on the same client may vary depending on the manufacture, model and software version of the DXA. Therefore, it is important to compare the measurements between different systems in longitudinal research studies and clinical practice. PURPOSE: To properly cross calibrate the body composition measurements between the Prodigy and iDXA in young adults. METHODS: Thirty healthy college students, including ten males (23.7 ± 1.9 years; 171.9 ± 6.7 cm; 81.8 ± 11.4 kg) and twenty females (23.1 ± 1.9 years; 161.8 ± 6.1 cm; 64.9 ± 15.3 kg) participated in the study. Body composition was measured using two DXA systems: Prodigy and iDXA, and analyzed by enCORE version 13 and 17, respectively by the same licensed DXA technician on the same day. Paired sample t-tests and regression analyses were performed to compare the body composition variables between the two systems. RESULTS: No significant differences were found in total body and leg percent fat (%fat), total and leg Fat Mass (FM), and total Bone Free Lean Mass (BFLM) (p > 0.05). However, there were statistically significant differences in total body and leg Bone Mineral Content (BMC) (p = 0.000), arm %fat (p = 0.012), arm FM (p = 0.000), arm and leg BFLM (ALM, p = 0.000) between the two systems (Table 1). CONCLUSION: Our results suggest that calibration equations are needed for the appendicular lean mass when comparing body composition between the Prodigy and iDXA in young adults. Further study in older adults is needed for the comparison of sarcopenia assessment using the two models of DXA.Table 1: Comparison of Regional Body Composition Between iDXA and ProdigyBFLM: Bone Free Lean Mass; FM: Fat Mass
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