量化与骨相关的活动及其与女孩骨强度的关系。
Quantifying bone-relevant activity and its relation to bone strength in girls.
机构信息
Department of Physiological Sciences, University of Arizona, Tucson, AZ 85721-0093, USA.
出版信息
Med Sci Sports Exerc. 2011 Mar;43(3):476-83. doi: 10.1249/MSS.0b013e3181eeb2f2.
UNLABELLED
Physical activity (PA) is critical for maximizing bone development during growth. However, there is no consensus on how well existing PA measurement tools predict bone strength.
PURPOSE
The purposes of this study were to compare four methods of quantifying PA (pedometer, 3-d PA recall (3DPAR), bone-specific PA questionnaire (BPAQ), and past year PA questionnaire (PYPAQ)), in young girls and to evaluate their ability to predict indices of bone strength.
METHODS
A total of 329 girls aged 8-13 yr completed a pedometer assessment, the 3DPAR, the BPAQ, and a modified PYPAQ. Peripheral quantitative computed tomography was used to assess bone strength index (BSI) at metaphyseal (4% distal femur and tibia) sites and strength-strain index (SSI) at diaphyseal (femur = 20%, tibia = 66%) sites of the nondominant leg. Correlations and hierarchical multiple regression were used to assess relationships among PA measures and indices of bone strength.
RESULTS
After adjusting for maturity, correlations between PA measures and indices of bone strength were positive, although low (r = 0.01-0.20). Regression models that included covariates (maturity, body mass, leg length, and ethnicity) and PA variables showed that PYPAQ score was significantly (P < 0.05) associated with BSI and SSI at all sites and explained more variance in BSI and SSI than any other PA measure. Pedometer steps were significantly (P < 0.05) associated with metaphyseal femur and tibia BSI, and 3DPAR score was significantly (P < 0.05) associated with metaphyseal femur BSI. BPAQ score was not significantly (P > 0.05) associated with BSI or SSI at any sites.
CONCLUSIONS
A modified PYPAQ that accounts for the duration, frequency, and load of PA predicted indices of bone strength better than other PA measures.
非标记
身体活动（PA）对于最大限度地促进生长期间的骨骼发育至关重要。然而，对于现有的 PA 测量工具如何预测骨强度，目前尚无共识。
目的
本研究的目的是比较四种量化 PA 的方法（计步器、3 维 PA 回忆（3DPAR）、骨特异性 PA 问卷（BPAQ）和过去一年 PA 问卷（PYPAQ））在年轻女孩中的应用，并评估它们预测骨强度指标的能力。
方法
共有 329 名 8-13 岁女孩完成了计步器评估、3DPAR、BPAQ 和改良的 PYPAQ 问卷调查。使用外周定量计算机断层扫描评估非优势腿的骨干（股骨= 20%，胫骨= 66%）和干骺端（股骨 4%远端和胫骨）部位的骨强度指数（BSI）和强度应变指数（SSI）。使用相关性和分层多元回归评估 PA 测量值与骨强度指标之间的关系。
结果
在调整成熟度后，PA 测量值与骨强度指标之间存在正相关，尽管相关性较低（r=0.01-0.20）。包含协变量（成熟度、体重、腿长和种族）和 PA 变量的回归模型表明，PYPAQ 评分与所有部位的 BSI 和 SSI 显著相关（P<0.05），并解释了 BSI 和 SSI 中更多的变异。计步器步数与骨干股骨和胫骨 BSI 显著相关（P<0.05），3DPAR 评分与骨干股骨 BSI 显著相关（P<0.05）。BPAQ 评分与任何部位的 BSI 或 SSI 均无显著相关性（P>0.05）。
结论
考虑到 PA 的持续时间、频率和负荷的改良 PYPAQ 预测骨强度指标的效果优于其他 PA 测量值。
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