Accuracy of gastrocnemius muscles forces in walking and running goats predicted by one-element and two-element Hill-type models.
Accuracy of gastrocnemius muscles forces in walking and running goats predicted by one-element and two-element Hill-type models.
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DOI：
10.1016/j.jbiomech.2013.06.001
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发表时间：
2013-09-03
影响因子：
2.4
通讯作者：
Wakeling, James M.
中科院分区：
文献类型：
--
作者：
Lee, Sabrina S. M.;Arnold, Allison S.;Miara, Maria de Boef;Biewener, Andrew A.;Wakeling, James M.
山型模型通常用于估计人类和动物运动过程中的肌肉力量，但在行走、跑步和其他任务中估计的力量的准确性在很大程度上仍然未知。此外，大多数希尔型模型假设一个单一的收缩元素，尽管有证据表明，更快和更慢的运动单位，具有不同的激活-失活动力学，可以独立或集体兴奋。本研究评估了一种新的，两个元素的希尔型模型与“差分”激活的快速和缓慢的收缩元素。模型的性能进行了评估，使用一个全面的数据集（包括肌电强度，肌束长度，肌腱力的措施）收集的山羊腓肠肌在运动实验。新的两个元件模型预测的肌肉力量进行了比较，使用传统的一个元件模型估计的力量，并在体内使用肌腱屈曲传感器测量的力量。总体而言，两个元件模型导致在体内腓肠肌力的最佳预测。的决定系数，r2，是高达26.9%，均方根误差，RMSE，是高达37.4%，低于两个元素的模型比一个元素的模型测试。所有模型均捕获了行走、小跑和奔马期间测得的肌力的显著特征（r2 = 0.26至0.51），并且均显示出一些误差（RMSE = 9.63至32.2%的最大体内力）。这些比较提供了重要的洞察希尔型模型的准确性。研究结果还表明，在肌肉模型中加入快速和缓慢收缩元素可以改善运动任务期间随时间变化的整体肌肉力量的估计。
Hill-type models are commonly used to estimate muscle forces during human and animal movement —yet the accuracy of the forces estimated during walking, running, and other tasks remains largely unknown. Further, most Hill-type models assume a single contractile element, despite evidence that faster and slower motor units, which have different activation-deactivation dynamics, may be independently or collectively excited. This study evaluated a novel, two-element Hill-type model with “differential” activation of fast and slow contractile elements. Model performance was assessed using a comprehensive data set (including measures of EMG intensity, fascicle length, and tendon force) collected from the gastrocnemius muscles of goats during locomotor experiments. Muscle forces predicted by the new two-element model were compared to the forces estimated using traditional one-element models and to the forces measured in vivo using tendon buckle transducers. Overall, the two-element model resulted in the best predictions of in vivo gastrocnemius force. The coefficient of determination, r2, was up to 26.9% higher and the root mean square error, RMSE, was up to 37.4% lower for the two-element model than for the one-element models tested. All models captured salient features of the measured muscle force during walking, trotting, and galloping (r2 = 0.26 to 0.51), and all exhibited some errors (RMSE = 9.63 to 32.2% of the maximum in vivo force). These comparisons provide important insight into the accuracy of Hill-type models. The results also show that incorporation of fast and slow contractile elements within muscle models can improve estimates of time-varying, whole muscle force during locomotor tasks.
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影响因子：
2.5
作者：
Lee, Sabrina S. M.;Miara, Maria de Boef;Arnold, Allison S.;Biewener, Andrew A.;Wakeling, James M.
通讯作者：
Wakeling, James M.
影响因子：
2.5
作者：
von Tscharner, V
通讯作者：
von Tscharner, V
影响因子：
2.5
作者：
Sandercock, TG;Heckman, CJ
通讯作者：
Heckman, CJ
DOI：
10.1080/1025584031000091678
发表时间：
2003-04-01
影响因子：
1.6
作者：
Umberger, Brian R.;Gerritsen, Karin G. M.;Martin, Philip E.
通讯作者：
Martin, Philip E.
影响因子：
4.1
作者：
Boel, Markus;Sturmat, Maike;Kober, Cornelia
通讯作者：
Kober, Cornelia