Young K C, Sherk V D, Bemben D A
Bone Density Research Laboratory, Department of Health and Exercise Science, University of Oklahoma, Norman, Oklahoma 73019, USA.
J Musculoskelet Neuronal Interact. 2011 Mar;11(1):21-6.
To compare musculoskeletal characteristics of the loaded and non-loaded forearm and upper leg of competitive ten-pin bowlers.
10 competitive bowlers (30.6∓6.8 yrs) had their areal bone mineral density (aBMD) and body composition measured with Dual Energy X-ray Absorptiometry (DXA). Volumetric bone mineral density (vBMD) and bone characteristics were assessed at 4% and 66% of the limb length of each radius and 50% of the limb length of each femur using a pQCT. Bone and muscle characteristics of the loaded and non-loaded limbs were compared and analyzed using paired t-tests.
The loaded arm of competitive bowlers had significantly (p<0.05) greater bone free lean body mass (BFLBM) (5%) and ultra distal radius site (UD radius) aBMD (6.3%) compared to the non-loaded side. Cortical and trabecular vBMD was significantly (p<0.05) greater (1.3%, 4.8%) at the radius 66% and 4% sites in the loaded forearm, respectively. aBMD of the femoral neck, trochanter, and total hip were significantly greater (12.2-15.6%) in the slide leg. Total (5.2%) and cortical (9.2%) bone areas, total (8.2%) and cortical (8.7%) bone mineral content (BMC), and cortical wall thickness (9%) were significantly greater at the 50% femur site in the slide leg compared to the contralateral side.
The femoral shaft of bowlers adapts by increasing bone area and cortical thickness without a change in vBMD, while the loaded radius adapts by increasing vBMD.
比较职业保龄球运动员负重和非负重前臂及大腿的肌肉骨骼特征。
10名职业保龄球运动员（30.6±6.8岁）采用双能X线吸收法（DXA）测量其骨面积密度（aBMD）和身体成分。使用外周定量CT（pQCT）在每个桡骨肢体长度的4%和66%以及每个股骨肢体长度的50%处评估骨体积密度（vBMD）和骨骼特征。使用配对t检验比较和分析负重和非负重肢体的骨骼和肌肉特征。
与非负重侧相比，职业保龄球运动员的负重手臂具有显著更高（p<0.05）的无骨瘦体重（BFLBM）（5%）和桡骨最远端部位（UD桡骨）aBMD（6.3%）。负重前臂在桡骨66%和4%部位的皮质和小梁vBMD分别显著更高（p<0.05）（1.3%，4.8%）。滑动腿的股骨颈、大转子和全髋的aBMD显著更高（12.2 - 15.6%）。与对侧相比，滑动腿在股骨50%部位的总骨面积（5.2%）和皮质骨面积（9.2%）、总骨矿物质含量（BMC）（8.2%）和皮质骨矿物质含量（8.7%）以及皮质骨壁厚（9%）均显著更大。
保龄球运动员的股骨干通过增加骨面积和皮质厚度来适应，而vBMD不变，而负重的桡骨则通过增加vBMD来适应。
