Maintaining femoral bone density in adults: how many steps per day are enough?
Maintaining femoral bone density in adults: how many steps per day are enough?
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DOI：
10.1007/s00198-011-1538-9
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发表时间：
2011-12-01
影响因子：
4
通讯作者：
Beaupre, Gary S.
中科院分区：
文献类型：
--
作者：
Boyer, Katherine A.;Kiratli, B. Jenny;Beaupre, Gary S.
维持健康骨骼所需的步行量和强度尚不清楚。本研究利用定量理论研究了健康个体的习惯性步行活动与股骨骨密度（BMD）之间的关系。我们的研究结果表明，性别、体重和步行干预的速度敏感性。步行预防骨质疏松症已被广泛推广。维持健康骨骼所需的步行量和强度尚不清楚，并且缺乏支持每天具体步数目标的证据。本研究的目的是利用定量的骨骼维持理论来研究健康个体的习惯性步行活动与股骨骨矿物质密度（BMD）之间的关系。方法测定105例49 ~ 64岁患者的习惯性步行活动量和总股骨骨密度。累积负荷指数（骨密度指数，BDI）作为骨密度的预测指标。BDI-BMD关系用于预测在体重（BW）和步行速度范围内维持健康BMD值的每日步数。结果女性BDI与BMD呈正相关，男性无相关性（r (2) = 0.19, p < 0.001）。对于研究队列中平均体重为1.00 m/s的女性，每天步行4,892步/天以维持t -1.0评分所需的总步数。体重比平均体重轻20%的女性需要更多的步数（18568步/天）。对于这些体重较轻的雌性，只有在行走速度大于1.32 m/s时，10000步/天才足以维持-1.0的t评分。结论：我们的研究结果表明，性别、体重和速度敏感性对骨质疏松症的步行干预有影响。对于低体重的人来说，每天维持骨密度所需的步数可能远远大于经常引用的10,000步。
The amount and intensity of walking to maintain a healthy skeleton is unknown. This study examined the relationship between habitual walking activity and femoral bone mineral density (BMD) in healthy individuals using a quantitative theory for bone maintenance. Our results suggest a gender, weight, and speed sensitivity of walking interventions.Introduction Walking has been extensively promoted for the prevention of osteoporosis. The amount and intensity of walking to maintain a healthy skeleton is unknown and evidence to support a specific target of steps per day is lacking. The goal of our study was to examine the relationship between habitual walking activity and femoral bone mineral density (BMD) in healthy individuals using a quantitative theory for bone maintenance.Methods Habitual walking activity and total femur BMD were measured in 105 individuals (49-64 years). An index of cumulative loading (bone density index, BDI) was examined as a predictor of BMD. The BDI-BMD relationship was used to predict the steps per day to maintain healthy BMD values for a range of body weights (BW) and walking speeds.Results For females but not for males, BDI was correlated with BMD (r (2) = 0.19, p < 0.001). The total required steps per day to maintain a T-score of -1.0 for a female with the average BW of the study cohort, walking at 1.00 m/s is 4,892 steps/day. Substantially more steps (18,568 steps/day) are required for a female with a BW 20% lighter than the average for our female cohort. For these lighter females, only at a walking speed greater than 1.32 m/s was 10,000 steps/day sufficient to maintain a T-score of -1.0.Conclusions Our results suggest a gender, weight, and speed sensitivity of walking interventions for osteoporosis. In persons of low BW, the necessary steps per day to maintain BMD can be substantially greater than the often-quoted 10,000 steps.