Sensitivity of estimated muscle force in forward simulation of normal walking.

Sensitivity of estimated muscle force in forward simulation of normal walking.
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DOI:
10.1123/jab.26.2.142
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发表时间:
2010-05
影响因子:
1.4
通讯作者:
Higginson J
Higginson J
中科院分区:
工程技术4区
文献类型:
--
作者:
Xiao M;Higginson J

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通用肌肉参数通常用于人体运动的肌肉驱动模拟中,以估计个体肌肉力和功能。由于肌肉特性因受试者而异,因此结果可能无效。本研究探讨了肌肉驱动的前向模拟中使用通用参数对肌肉力量估计的影响。我们在OpenSim中生成了一个正常的步行模拟,并检查了单个肌肉对肌肉参数扰动的敏感性,包括肌肉数量,最大等长力,最佳纤维长度和肌腱松弛长度。我们发现,当改变模型中包含的肌肉数量时,只有估计的肌肉力量的大小受到影响。我们的研究结果还表明,使用准确的肌腱松弛长度和踝跖屈肌和膝伸肌的最佳纤维长度值是特别重要的。一个肌肉的力量产生的变化通常由同一功能肌群或拮抗肌群中的肌肉的力量产生的变化来补偿。基于通用肌肉骨骼参数模拟得出的关于肌肉功能的结论应谨慎解释。
Generic muscle parameters are often used in muscle-driven simulations of human movement estimate individual muscle forces and function. The results may not be valid since muscle properties vary from subject to subject. This study investigated the effect of using generic parameters in a muscle-driven forward simulation on muscle force estimation. We generated a normal walking simulation in OpenSim and examined the sensitivity of individual muscle to perturbations in muscle parameters, including the number of muscles, maximum isometric force, optimal fiber length and tendon slack length. We found that when changing the number muscles included in the model, only magnitude of the estimated muscle forces was affected. Our results also suggest it is especially important to use accurate values of tendon slack length and optimal fiber length for ankle plantarflexors and knee extensors. Changes in force production one muscle were typically compensated for by changes in force production by muscles in the same functional muscle group, or the antagonistic muscle group. Conclusions regarding muscle function based on simulations with generic musculoskeletal parameters should be interpreted with caution.
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