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首页> 外文期刊>Journal of Biomechanics >A mass-length scaling law for modeling muscle strength in the lower limb.
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A mass-length scaling law for modeling muscle strength in the lower limb.

机译：用于模拟下肢肌肉力量的质量长度缩放定律。

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Musculoskeletal computer models are often used to study muscle function in children with and without impaired mobility. Calculations of muscle forces depend in part on the assumed strength of each muscle, represented by the peak isometric force parameter, which is usually based on measurements obtained from cadavers of adult donors. The aim of the present study was twofold: first, to develop a method for scaling lower-limb peak isometric muscle forces in typically-developing children; and second, to determine the effect of this scaling method on model calculations of muscle forces obtained for normal gait. Muscle volumes were determined from magnetic resonance (MR) images obtained from ten children aged from 7 to 13yr. A new mass-length scaling law was developed based on the assumption that muscle volume and body mass are linearly related, which was confirmed by the obtained volume and body mass data. Two musculoskeletal models were developed for each subject: one in which peak isometric muscle forces were estimated using the mass-length scaling law; and another in which these parameters were determined directly from the MR-derived muscle volumes. Musculoskeletal modeling and quantitative gait analysis were then used to calculate lower-limb muscle forces in normal walking. The patterns of muscle forces predicted by the model with scaled peak isometric force values were similar to those predicted by the MR-based model, implying that assessments of muscle function obtained from these two methods are practically equivalent. These results support the use of mass-length scaling in the development of subject-specific musculoskeletal models of children.
机译：肌肉骨骼计算机模型通常用于研究行动不便儿童的肌肉功能。肌肉力量的计算部分取决于由等轴测力峰值参数代表的每条肌肉的假定力量，该力量通常基于从成年供体的尸体获得的测量值。本研究的目的是双重的：首先，开发一种在典型发育中的儿童中缩放下肢峰值等轴测肌力的方法。其次，确定这种缩放方法对正常步态获得的肌肉力量模型计算的影响。从十个7至13岁的儿童的磁共振（MR）图像确定肌肉体积。基于肌肉体积与体重呈线性相关的假设，开发了一种新的质量长度缩放定律，这一假设已通过获得的体积与体重数据得到证实。针对每个受试者开发了两种肌肉骨骼模型：一种是使用质量长度比例定律来估算等距肌肉的峰值力量;另一种是通过肌肉长度比例定律估算肌肉的峰值。另一个参数是直接根据MR衍生的肌肉体积确定的。然后，使用肌肉骨骼建模和定量步态分析来计算正常步行中的下肢肌肉力。具有按比例的峰值等距力值的模型预测的肌肉力模式与基于MR的模型所预测的模式相似，这意味着从这两种方法获得的肌肉功能评估实际上是等效的。这些结果支持质量长度缩放在儿童的特定于对象的骨骼肌肉模型的开发中的使用。

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