Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 6. Bone parameters in the third metacarpal and third metatarsal bones
Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 6. Bone parameters in the third metacarpal and third metatarsal bones
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DOI：
10.1080/00480169.2005.36487
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发表时间：
2005-04-01
影响因子：
1.4
通讯作者：
Jopson, NB
中科院分区：
文献类型：
--
作者：
Firth, EC;Rogers, CW;Jopson, NB
目的：为了确定一个已知的训练方案的大小和矿物质含量的第三掌骨（Mc3）和第三跖骨（Mt3）的2岁纯种马在racetracks.METHODS训练的影响：Mc3和Mt3的7匹马在草地和沙地上的轨道进行了扫描，在几个网站使用常规的定量和外周计算机断层扫描（CT）。骨干和骨骺的骨尺寸和密度进行了比较，从7个未经训练的马。在第9周和第12周期间，分两组注射钙黄绿素标记物。骨干建模的程度和速度由共聚焦荧光显微镜检查薄平面平行部分的中间掌骨regions.Results：体积骨矿物质密度（BMDV）的骨骺显着较高，骨干是略高于训练与未经训练的马，但更大的骨骼大小在训练的马有最大的影响，骨强度的指数。活性骨单位，定义为含有钙黄绿素标记的哈弗系统，较少，在钙黄绿素注射时直径较小，并且在训练的马中比未训练的马具有更大的骨沉积率。结论：与未训练的马相比，2岁纯种赛马在13周期间的常规训练对骨大小、密度和强度指数有显著影响。骨头对早期训练反应迅速。这些数据为商业训练方案的纵向研究提供了参考值和地点。
AIM: To determine the effect of a known training regimen on the size and mineral content of the third metacarpal (Mc3) and third metatarsal (Mt3) bones of 2-year-old Thoroughbred horses trained on racetracks.METHODS: Mc3 and Mt3 of seven horses trained on grass and sand tracks were scanned at several sites using conventional quantitative and peripheral computed tomography (CT). Bone dimensions and density in the diaphysis and epiphysis were compared with those from seven untrained horses. Calcein label was injected in two clusters, during Weeks 9 and 12. The extent and rate of diaphyseal modelling was determined by confocal fluorescent microscopic examination of thin plane parallel sections of the mid-metacarpal region.RESULTS: Volumetric bone mineral density (BMDV) of the epiphysis was markedly higher and of the diaphysis was slightly higher in trained compared with untrained horses, but greater bone size in the trained horses had the greatest effect on an index of bone strength. Active osteons, defined as Haversian systems containing calcein label, were fewer, of smaller diameter at the time of calcein injection, and had a greater bone apposition rate in trained than in untrained horses.CONCLUSIONS: Conventional training of 2-year-old Thoroughbred racehorses over a 13-week period had a significant effect on bone size, density and strength index when compared to untrained horses.CLINICAL RELEVANCE: Bone responded rapidly to early training. The data provide reference values and sites for use in longitudinal studies of commercial training regimens.