Concentric and eccentric isokinetic resistance training similarly increases muscular strength, fat-free soft tissue mass, and specific bone mineral measurements in young women
Concentric and eccentric isokinetic resistance training similarly increases muscular strength, fat-free soft tissue mass, and specific bone mineral measurements in young women
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同心和偏心等速阻力训练同样可以增加年轻女性的肌肉力量、无脂肪软组织质量和特定的骨矿物质测量值
DOI：
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发表时间：
2007
影响因子：
4
通讯作者：
William G. Herbert
中科院分区：
文献类型：
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作者：
Sharon M. Nickols;Larry E. Miller;D. Wootten;Warren K. Ramp;William G. Herbert
摘要女性参加了为期 5 个月的单侧向心 (n = 37) 或偏心 (n = 33) 腿部和手臂等速阻力训练。四肢肌肉力量增加，全身、腿部和手臂的无脂肪软组织质量、全身 BMC、髋部 BMD、前臂 BMC 和 BMD 也增加。等速训练有利于骨矿物质的获取。简介和假设等速阻力训练（IRT）是成骨的；然而，尚不清楚同心或偏心 IRT 模式是否会对骨骼产生不同的影响。我们测试了我们的假设，即 IRT 的高负荷偏心模式与向心模式相比，训练后的腿部和手臂的肌肉力量、无脂肪软组织质量 (FFSTM)、骨矿物质密度 (BMD) 和骨含量 (BMC) 会产生更大的增加。方法参与者被随机分为 5 个月的向心 (n = 37) 或偏心 (n = 33) 训练。训练时使用非优势腿和手臂；优势肢体作为对照。用等速测力计测量肌肉力量；通过双能X射线吸收仪测量身体成分。结果向心和离心训练的腿部(18.6%;28.9%)和手臂(12.5%;24.6%)的肌肉力量随着训练显着增加。两组的全身 (TB) BMC (p < 0.05) 以及受训四肢的总股骨近端 BMD (p < 0.05) 和总前臂 BMD (p < 0.05) 和 BMC (p < 0.05) 均有所增加。在两种模式下，结核病以及受训腿部和手臂的 FFSTM 均有所增加（均 p< 0.001）。 结论 无论哪种模式，高强度、慢速 IRT 均会增加受训肢体的肌肉力量和 FFSTM，并对年轻女性的结核病 BMC 以及部位特异性 BMD 和 BMC 带来益处。
SummaryWomen participated in 5 months of unilateral concentric (n = 37) or eccentric (n = 33) isokinetic resistance training of the legs and arms. Limb muscular strength increased as did total body, leg, and arm fat-free soft tissue mass, total body BMC, hip BMD, and forearm BMC and BMD. Isokinetic training benefits bone mineral acquisition.Introduction and hypothesisIsokinetic resistance training (IRT) is osteogenic; however, it is not known if concentric or eccentric modalities of IRT produce differential effects on bone. We tested our hypothesis that high-load eccentric versus concentric mode of IRT would produce greater increases in muscular strength, fat-free soft tissue mass (FFSTM), bone mineral density (BMD) and content (BMC) in trained legs and arms.MethodsParticipants were randomized to 5 months of concentric (n = 37) or eccentric (n = 33) training. The non-dominant leg and arm were used during training; dominant limbs served as controls. Muscular strength was measured with an isokinetic dynamometer; body composition was measured by dual-energy X-ray absorptiometry.ResultsMuscular strength of the concentrically and eccentrically trained leg (18.6%; 28.9%) and arm (12.5%; 24.6%) significantly increased with training. Gains in total body (TB) BMC (p < 0.05) and, in the trained limbs, total proximal femur BMD (p < 0.05) and total forearm BMD (p < 0.05) and BMC (p < 0.05) occurred in both groups. FFSTM increased for the TB and trained leg and arm (all p < 0.001) in both modes.ConclusionRegardless of the mode, high-intensity, slow-velocity IRT increases muscular strength and FFSTM of trained limbs and imparts benefits to TB BMC and site-specific BMD and BMC in young women.