Firth E C, Goodship A E, Delahunt J, Smith T
Institute of Veterinary, Animal and Biomedical Sciences, College of Sciences, Massey University, Palmerston North, New Zealand.
Equine Vet J Suppl. 1999 Jul(30):552-4. doi: 10.1111/j.2042-3306.1999.tb05282.x.
Bone mineral density (BMD) was measured by dual x-ray absorptiometry (DXA) in the carpus of 6 Thoroughbreds age 24 months that were exercised on the treadmill for 4.5 months, and of 6 matched control horses. A sagittal slab of known thickness was sawn from one or more of radius, radial carpal (Cr), third carpal (C3), and third metacarpal (Mc3) bones. After the 4.5 month treadmill exercise, there was a significantly greater volumetric BMD in the dorsal aspect of C3 (P = 0.006). Treadmill-exercised horses also had higher BMD in the dorsodistal aspect of the radius (P = 0.03), the dorsal half of Mc3 (P = 0.012), and the dorsal aspect of Cr (P = 0.04). In other areas of interest (AOI) studied on the palmar aspect of the bones, significant increases in exercised horses did not occur. These sizeable changes in bone mass occurred within a few months of initiation of exercise. With technical development, DXA could be applied in vivo for investigation of changes in bone mass of horses which are growing and exercising under various regimes. The data are also relevant to the development of scientifically based training protocols.
通过双能X线吸收法（DXA）测量了6匹24月龄纯种马腕骨的骨密度（BMD），这些马在跑步机上运动了4.5个月，同时测量了6匹配对的对照马。从一根或多根桡骨、桡腕骨（Cr）、第三腕骨（C3）和第三掌骨（Mc3）锯下已知厚度的矢状板。经过4.5个月的跑步机运动后，C3背侧的体积骨密度显著更高（P = 0.006）。跑步机运动的马在桡骨背远端（P = 0.03）、Mc3背侧一半（P = 0.012）和Cr背侧（P = 0.04）也有更高的骨密度。在研究的骨骼掌侧的其他感兴趣区域（AOI），运动马没有出现显著增加。这些骨量的显著变化在运动开始后的几个月内就发生了。随着技术的发展，DXA可用于体内研究在各种条件下生长和运动的马的骨量变化。这些数据也与基于科学的训练方案的制定相关。
