Waseda Institute of Sports Nutrition, Waseda University, Tokorozawa, Japan.
Department of Health and Nutrition, Jumonji University, Saitama, Japan.
Int J Sports Med. 2022 Jun;43(7):625-631. doi: 10.1055/a-1717-1619. Epub 2022 Feb 2.
The use of dual-energy X-ray absorptiometry (DXA) may be invalid for assessing athletes with larger bodies, larger lean body mass, and thicker trunks. This study compared the athletes' visceral adipose tissue (VAT) assessed using DXA and magnetic resonance imaging (MRI). Eighty-two Japanese male collegiate athletes from 18 sports participated in this study. VAT was assessed using the dual-energy scan that coincided with the 4th lumbar vertebra. The sum of eight magnetic resonance slices corresponding to the region of the dual-energy scan was used for comparison. The VAT volume was higher with the dual-energy scan than with MRI (difference: 35 cm, p<0.01). A significant correlation was noted between the volumes measured using both modalities (r=0.88, p<0.01). Magnetic resonance-derived volumes less than 600 cm showed a stronger significant correlation with dual-energy-derived volumes. However, magnetic resonance-derived VAT volumes exceeding 600 cm were not significantly correlated with dual-energy-derived volumes. In conclusion, VAT volumes derived from DXA were larger and significantly correlated with those derived from MRI across a wide range of values. Methods using DXA for assessing the visceral fat volume may require adjustment to estimate abdominal visceral fat volume in athletes, with care taken when using such methods for heavyweight athletes.
双能 X 射线吸收法（DXA）在评估体型较大、瘦体重较大和躯干较厚的运动员时可能无效。本研究比较了 DXA 和磁共振成像（MRI）评估运动员内脏脂肪组织（VAT）的结果。来自 18 项运动的 82 名日本男性大学生运动员参加了这项研究。VAT 使用与第 4 腰椎相对应的双能扫描进行评估。使用与双能扫描相对应的 8 个磁共振切片的总和进行比较。双能扫描测量的 VAT 体积高于 MRI（差值：35cm，p<0.01）。两种方法测量的体积之间存在显著相关性（r=0.88，p<0.01）。磁共振衍生的体积小于 600cm 时与双能衍生的体积具有更强的显著相关性。然而，磁共振衍生的 VAT 体积超过 600cm 时与双能衍生的体积没有显著相关性。总之，DXA 衍生的 VAT 体积较大，与 MRI 衍生的 VAT 体积在广泛的范围内具有显著相关性。使用 DXA 评估内脏脂肪体积的方法可能需要进行调整，以估计运动员的腹部内脏脂肪体积，对于体重较大的运动员，使用这些方法时需要谨慎。
