Modlesky C M, Majumdar S, Dudley G A
Department of Health, Nutrition and Exercise Sciences, University of Delaware, Newark, DE, 19716, USA.
Osteoporos Int. 2008 Jul;19(7):1011-8. doi: 10.1007/s00198-007-0522-x. Epub 2007 Dec 12.
Using high-resolution magnetic resonance imaging, we observed more developed trabecular bone microarchitecture in the proximal tibia of female collegiate gymnasts vs. matched controls. This suggests that high-load physical activity may have a positive effect on the trabecular microarchitecture in weight-bearing bone.
Participation in physical activities that overload the skeleton, such as artistic gymnastics, is associated with increased areal bone mineral density (aBMD); however, the status of trabecular microarchitecture in the weight-bearing bone of gymnasts is unknown.
Eight female collegiate artistic gymnasts and eight controls matched for age, height, body mass, gender and race were recruited for the study. Apparent trabecular bone volume to total volume (appBV/TV), trabecular number (appTb.N), thickness (appTb.Th) and trabecular separation (appTb.Sp) were determined using high resolution magnetic resonance imaging. Areal bone mineral density, bone mineral content (BMC) and bone area in the proximal tibia were determined using dual-energy X-ray absorptiometry. Group differences were determined using t-tests. The magnitude of group differences was expressed using Cohen's d (d).
Gymnasts had higher appBV/TV (13.6%, d = 1.22) and appTb.N (8.4%, d = 1.45), and lower appTb.Sp (13.7%, d = 1.33) than controls (p < 0.05). Gymnasts had higher aBMD and BMC in the proximal tibia, although the differences were smaller in magnitude (d = 0.75 and 0.74, respectively) and not statistically significant (p > 0.05).
The findings suggest that high-load physical activity, such as performed during gymnastics training, may enhance the trabecular microarchitecture of weight-bearing bone.
通过高分辨率磁共振成像，我们观察到与匹配的对照组相比，女性大学体操运动员胫骨近端的小梁骨微结构更为发达。这表明高负荷体育活动可能对负重骨的小梁微结构有积极影响。
参与使骨骼承受超负荷的体育活动，如艺术体操，与骨面积骨密度（aBMD）增加有关；然而，体操运动员负重骨中小梁微结构的状况尚不清楚。
招募了八名年龄、身高、体重、性别和种族相匹配的女性大学艺术体操运动员和八名对照者进行研究。使用高分辨率磁共振成像确定表观小梁骨体积与总体积之比（appBV/TV）、小梁数量（appTb.N）、厚度（appTb.Th）和小梁间距（appTb.Sp）。使用双能X线吸收法测定胫骨近端的骨面积骨密度、骨矿物质含量（BMC）和骨面积。使用t检验确定组间差异。组间差异的大小用科恩d值（d）表示。
与对照组相比，体操运动员的appBV/TV更高（13.6%，d = 1.22），appTb.N更高（8.4%，d = 1.45），appTb.Sp更低（13.7%，d = 1.33）（p < 0.05）。体操运动员胫骨近端的aBMD和BMC更高，尽管差异幅度较小（分别为d = 0.75和0.74）且无统计学意义（p > 0.05）。
研究结果表明，高负荷体育活动，如体操训练期间进行的活动，可能会增强负重骨的小梁微结构。
