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相关概念视频

General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

554
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
554

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相关实验视频

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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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青少年骨的机械负载能力模型 - - 风险特征分析

Marília Marques1,2, Paula Bruno1, Filomena Vieira1

  • 1CIPER, Faculdade de Motricidade Humana, Universidade de Lisboa, Portugal.

Journal of musculoskeletal & neuronal interactions
|March 1, 2026
PubMed
概括

低肌肉质量,无论是结构性的 (尾肌肉软组织指数) 还是功能性的 (手握强度),都与青少年的骨矿物质密度降低有关. 监测瘦软组织对于青少年的骨健康至关重要.

科学领域:

  • 儿科内分泌学 儿科内分泌学
  • 骨健康研究 骨健康研究
  • 青少年健康 青少年健康

背景情况:

  • 机械负荷会影响骨的发育.
  • 瘦软组织在骨健康中起着重要作用.
  • 了解影响青少年骨矿物质密度的因素至关重要.

研究的目的:

  • 调查青少年结构和功能性瘦体和骨矿物质密度之间的关联.
  • 为了检查尾瘦软组织指数 (ALSTI),干脂肪量 (TrFM) 和手握强度 (HGS) 与全身骨矿物质密度减去头部 (WBLH BMD) 和手臂/腿部 BMD 失衡之间的关系.

主要方法:

  • 对5,424名青少年 (10-19岁) 的横截面NHANES数据的分析.
  • 使用双能X射线吸收计测量ALST,TrFM和BMD.
  • 使用动力计评估HGS;根据性别和年龄组标准化变量 (Z-scores).

主要成果:

  • 在女孩和男孩中,低ALSTI与低WBLH BMD的更高几率有关.
  • 低HGS也与青少年女孩和男孩低WBLH BMD的几率增加有关.
  • 低HGS/身体质量显示,两性,特别是女孩的手臂/腿骨质量不平衡的几率显著更高.
关键词:
骨矿物质密度 骨矿物质密度脂肪质量 脂肪质量握手的强度 握手的强度瘦身 身体质量 瘦身 身体质量尼汉斯 (NHANES) 是一个名人.

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Half-segmental Diaphyseal Bone Defect Model in Rats for Evaluating Bone Substitute Performance in Load-bearing Regions
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结论:

  • 结构性和功能性瘦身质量的缺陷与青少年的骨矿物质密度和不平衡有关.
  • 这些发现强调了瘦软组织评估对于监测青少年骨健康的重要性.
  • 准瘦肉质量发展可能是改善年轻人群骨完整性的策略.