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首页> 外文期刊>Clinical biomechanics >Is maximum isometric muscle stress the same among prime elbow flexors?
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Is maximum isometric muscle stress the same among prime elbow flexors?

机译：肘等屈肌的最大等距肌肉应力是否相同？

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摘要

BACKGROUND: Previous musculoskeletal modeling studies have adopted the assumption of the same maximum isometric muscle stress among the prime elbow flexors. This study aimed at estimating the maximum isometric muscle stress based on subject-specific modeling parameters measured in vivo and validating that assumption. METHODS: Subject-specific musculoskeletal models of the upper limbs of five normal subjects were developed, which incorporated anthropometrically scaled graphics-based geometrical models and Hill-type musculotendon models of the prime elbow flexors. B-mode ultrasound technique was employed to measure the muscle optimal length and pennation angle of each prime elbow flexor, and these architectural parameters were inputted into the model to reduce the number of unknown parameters to be optimized. To allow changes of individual maximum isometric muscle force of the prime elbow flexors, optimizations were conducted by minimizing the root mean square difference between the predicted and measured isometric torque-angle curves. Maximum isometric muscle stress of each prime elbow flexor was estimated by dividing the maximum isometric muscle force with the corresponding physiological cross-sectional area. FINDINGS: Our findings showed that maximum isometric muscle stress among the prime elbow flexors was not significantly different from each other. Thus it appears that it is reasonable to assume the same value for maximum isometric muscle stress for all prime elbow flexors in musculoskeletal modeling studies. INTERPRETATION: Latest medical imaging techniques such as ultrasound for the estimation of musculotendon parameters would provide an alterative method to obtain the muscle architecture parameters noninvasively. The subject-specific musculotendon parameters estimated in this study could be used for developing the neuromusculoskeletal model to predict muscle force and evaluate muscle functions.
机译：背景：以前的肌肉骨骼建模研究已经采用了在主要肘屈肌之间相同最大等轴测肌肉应力的假设。这项研究旨在根据在体内测量的特定于受试者的建模参数估算最大等距肌肉应力，并验证该假设。方法：建立了五名正常受试者上肢的特定于受试者的骨骼模型，该模型结合了人体测量比例的基于图形的几何模型和主要肘屈肌的Hill型骨骼肌模型。采用B型超声技术测量每个肘屈肌的最佳肌肉长度和垂度，并将这些结构参数输入到模型中，以减少待优化的未知参数的数量。为了允许肘关节屈肌的最大等轴测肌力发生变化，通过最小化预测和测得的等轴测扭矩角曲线的均方根差来进行优化。通过将最大等轴测肌力除以相应的生理学横截面积，可以估算出每个肘关节屈肌的最大等轴测肌应力。结果：我们的研究结果表明，肘关节屈肌之间的最大等轴测肌压力彼此之间无显着差异。因此，在肌肉骨骼模型研究中，所有主要肘屈肌的最大等轴肌应力假定相同的值似乎是合理的。解释：最新的医学成像技术，如超声，用于评估肌腱参数，将提供一种替代方法，以无创方式获得肌肉结构参数。在这项研究中估计的特定于受试者的肌腱参数可以用于开发神经肌肉骨骼模型，以预测肌肉力量并评估肌肉功能。

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