需要速度 - - 力-速度属性是否能显著改变骨肌肉内的应变分布?
Matthew D DiSalvo1, Silvia S Blemker2
1Dept. of Biomedical Engineering, University of Virginia, Charlottesville, USA.
Journal of biomechanics
|April 12, 2024
概括
骨肌的有限元素模型得到了增强,包括力-速度属性. 这种含有影响了线状肌肉模型中的纤维应变分布,但在BFLH等复杂几何模型中影响较小.
科学领域:
- 生物力学 生物力学
- 计算生物学 计算生物学
- 肌肉生理学 肌肉生理学
背景情况:
- 骨肌肉具有复杂的,非线性构成性质.
- 有限元 (FE) 建模对于理解肌肉行为和激活反应至关重要.
- 现有的FE肌肉模型往往缺乏力-速度特性,限制了应变分布分析.
研究的目的:
- 为了研究力-速度特性对骨肌肉纤维应变分布的影响.
- 开发和实施一个增强的构成模型,包括力-速度行为.
- 评估变化的最大纤维速度和边界条件对应变模式的影响.
主要方法:
- 修改了肌肉构成模型,以包括主动,被动力-长度和力-速度属性.
- 实现了增强模型作为FEBio软件的插件.
- 将模型应用于四种几何形状:单元,多元纤维,逐渐缩小的纤维和双腿骨长头 (BFLH).
主要成果:
- 力量-速度属性在单元和多元元素模型中按预期运行.
- 在逐渐缩小的纤维模型中,增加最大纤维速度导致了更广泛的纤维菌株范围,特别是在同度收缩期间.
- 在BFLH模型中,最大光纤速度对应变分布的影响最小,即使是在模拟冲刺时.
结论:
- 在FE肌肉模型中包含力-速度特性会影响纤维应变分布,特别是在更简单或更的几何形状中.
- 肌肉模型几何学,激活水平和位移参数是确定力-速度对应变的影响意义的关键因素.
- 进一步的研究可以通过结合力-速度动态来改进FE肌肉模型,以获得更准确的生物机械模拟.
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