Musculoskeletal Adaptations to Aging and eXercise (MAAX) Lab, Oklahoma State University, Stillwater, Oklahoma; and.
Oklahoma City Thunder Professional Basketball Club, Human and Player Performance, Oklahoma City, Oklahoma.
J Strength Cond Res. 2024 Jul 1;38(7):e359-e365. doi: 10.1519/JSC.0000000000004775. Epub 2024 Apr 25.
Redinger, AL, Russell, JL, Allen, SMF, and Baker, BS. Height restrictions for dual-energy X-ray absorptiometry: what are our options for body composition and bone health precision? J Strength Cond Res 38(7): e359-e365, 2024-Dual-energy X-ray absorptiometry (DXA) is commonly used for testing athlete's body composition, but many athletes are too tall. The first aim was to assess the viability of combining upper- and lower-body regions of interest (ROI), creating a combined scan for tall athletes who do not fit on the table and second, to provide practical solutions to DXA users who routinely scan tall athletes. Sixty subjects (34.8 ± 11.9 years; 171 ± 9 cm) completed 2 total-body DXA scans for baseline precision testing, using GE Lunar Prodigy (LP) or Hologic Horizon A (HA) models. Next, an upper body ROI from the skull to the distal femoral condyles was combined with a flipped scan (feet-to-head) ROI encompassing the proximal tibial plateau to the distal foot. Soft and bone tissue coefficient of variance (CV%) were calculated between the baseline scans and for the newly combined ROI scan. The combined ROI scan added 0.25-0.63% and 0.01-4.35% error rates for the LP and HA, respectively. An exploratory assessment of a GE Lunar iDXA demonstrated results similar to the HA with 4%+ error. The combined ROI scan is a user-friendly and precise method for older LP systems adding less than 1% error; however, newer DXA systems cannot use the stitched scan technique. Coaches and practitioners who use newer DXAs must prioritize consistently using the same boney landmarks (head, jaw, or feet) and ROI heights to provide precise longitudinal assessments of tall athletes' bone and body composition, until larger DXA tables become available.
雷丁格，AL，拉塞尔，JL，艾伦，SMF，和贝克，BS。双能 X 射线吸收法的高度限制：我们有哪些选择可以精确测量身体成分和骨骼健康？J 力量与条件研究 38(7)：e359-e365，2024-双能 X 射线吸收法（DXA）常用于测试运动员的身体成分，但许多运动员太高了。第一个目的是评估将上半身和下半身感兴趣区域（ROI）结合起来的可行性，为那些无法在桌子上进行测试的高个子运动员创建一个组合扫描，其次，为经常扫描高个子运动员的 DXA 用户提供实用的解决方案。60 名受试者（34.8±11.9 岁；171±9cm）完成了 2 次全身 DXA 扫描，用于基线精度测试，使用通用电气（GE）Lunar Prodigy（LP）或霍洛威（Hologic）Horizon A（HA）模型。接下来，将头骨到股骨远端髁的上半身 ROI 与翻转扫描（脚到头）ROI 相结合，该 ROI 包含胫骨近端平台到足远端。在基线扫描和新组合 ROI 扫描之间计算软组织和骨组织变异系数（CV%）。对于 LP 和 HA，组合 ROI 扫描分别增加了 0.25-0.63%和 0.01-4.35%的误差率。对通用电气（GE）Lunar iDXA 的探索性评估结果与霍洛威（Hologic）相似，误差率为 4%+。对于较旧的 LP 系统，组合 ROI 扫描是一种用户友好且精确的方法，增加的误差小于 1%；然而，较新的 DXA 系统不能使用拼接扫描技术。使用较新 DXA 的教练和从业者必须优先使用相同的骨性标志（头部、下巴或脚部）和 ROI 高度，以提供高个子运动员骨骼和身体成分的精确纵向评估，直到更大的 DXA 桌子可用。
