Muscle strength as a predictor of bone mineral density in young women.
Muscle strength as a predictor of bone mineral density in young women.
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肌肉力量作为年轻女性骨矿物质密度的预测指标。
DOI：
10.1002/jbmr.5650050608
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Marcus,R
中科院分区：
文献类型：
--
作者：
Snow-Harter,C;Bouxsein,M;Lewis,B;Charette,S;Weinstein,P;Marcus,R
人们普遍认为体育活动对骨骼有益。然而，肌肉力量与骨矿物质密度（BMD）的具体关系尚不清楚。我们检查了59名年龄在18 - 31岁的女性的力量和骨密度，她们的运动模式从久坐到活跃不等。通过双能x线吸收仪评估右侧股骨近端（髋关节）和脊柱（L2‐4）的矿物质密度。采用单光子吸收法测量中半径处的骨密度。动态强度（最大一次重复）测量了以下肌肉群：背部、肘部屈肌（二头肌）、腿伸肌（股四头肌）和髋屈肌、伸肌、内收肌和外展肌。等距握力用测力法测定。髋部矿物质密度与肌肉力量和体重独立相关，但与年龄无关。具体来说，股骨颈骨密度与背部力量和体重显著相关，而股骨粗隆和髋部整体矿物质密度与肱二头肌、背部和髋内收肌力量显著相关。髋部矿物质密度与股四头肌群的力量或髋屈肌、伸肌或外展肌的力量无关。此外，肌肉力量是腰椎和桡骨中矿物质密度的独立预测因子。在逐步多元回归分析中，二头肌力量被证明是髋部骨密度最可靠的预测指标，而握力最能预测腰椎和桡骨的骨密度。我们得出结论，肌肉力量是骨密度的独立预测因子，占年轻女性骨密度总方差的15 - 20%。此外，远离脊柱和髋关节的附着肌群可能对这些部位的骨矿物质密度产生重要影响。
It is widely accepted that physical activity is beneficial to bone. However, the specific relationships of muscle strength to bone mineral density (BMD) are poorly understood. We examined strength and BMD in 59 women aged 18‐31 years who ranged in exercise patterns from sedentary to active. Mineral density of the right proximal femur (hip) and spine (L2‐4) was evaluated by dual‐energy x‐ray absorptiometry. BMD at the midradius was measured by single‐photon absorptiometry. Dynamic strength (one repetition maximum) was measured for the following muscle groups: back, elbow flexors (biceps), leg extensors (quadriceps), and the hip flexors, extensors, adductors, and abductors. Isometric grip strength was assessed by dynamometry.Mineral density at the hip correlated independently with muscle strength and body weight, but not with age. Specifically, femoral neck BMD was significantly correlated with back strength and weight, whereas trochanter and overall hip mineral density were significantly related to biceps, back, and hip adductor strength. Hip mineral density was not related to strength of the quadriceps group or to that of the hip flexors, extensors, or abductors. In addition, muscle strength was an independent predictor of lumbar spine and midradius mineral density. In stepwise multiple regression analysis, biceps strength proved the most robust predictor of hip BMD and grip strength best predicted bone density at the lumbar spine and radius.We conclude that muscle strength is an independent predictor of bone mineral density, accounting for 15‐20% of the total variance in bone density of young women. In addition, it appears that muscle groups with attachments that are distant from the spine and hip may exert an important influence on bone mineral density at these sites.