A comparison of models explaining muscle activation patterns for isometric contractions
A comparison of models explaining muscle activation patterns for isometric contractions
复制标题
解释等长收缩的肌肉激活模式的模型比较
作者：
B. Bolhuis;S. Gielen
抽象的。运动控制研究中的主要问题之一是肌肉负荷分担问题，这源于跨越关节的肌肉数量超过关节自由度的数量。因此，存在许多不同的可能性来激活肌肉以产生期望的关节扭矩。在过去的几十年里，已经假设了几种描述肌肉激活的模型来解决这个问题。本研究提出了各种模型的理论分析，并比较了这些模型的预测与肌肉激活模式的新数据在各个方向上的等长收缩。现有的模型都不能完全拟合实验数据。最佳拟合通过基于肌肉力（∑mφ 2 m，几乎等同于Moore-Penrose伪逆解）、肌肉应力σ（∑mσm2）或肌肉激活α（∑mαm2）的平方和最小化的模型获得。由于肌肉激活模式对于等长收缩和运动是不同的，因此很可能其他模型或优化标准更适合于描述运动的肌肉激活模式。我们的模拟结果表明，预测的肌肉激活模式并不严重依赖于模型中的参数。这可以解释为什么肌肉激活模式对于所有受试者都是高度定型的，而不管受试者之间在许多神经解剖学方面（例如，肌肉的生理横截面积）的差异。
Abstract. One of the main problems in motor-control research is the muscle load sharing problem, which originates from the fact that the number of muscles spanning a joint exceeds the number of degrees of freedom of the joint. As a consequence, many different possibilities exist for the activation of muscles in order to produce a desired joint torque. Several models describing muscle activation have been hypothesized over the last few decades to solve this problem. This study presents theoretical analyses of the various models and compares the predictions of these models with new data on muscle activation patterns for isometric contractions in various directions. None of the existing models fitted the experimental data in all aspects. The best fit was obtained by models based on minimization of the squared sum of muscle forces (∑mφ2m, which is almost equivalent to the Moore-Penrose pseudo-inverse solution), muscle stress σ (∑mσm2) or muscle activation α (∑mαm2). Since muscle activation patterns are different for isometric contractions and for movements, it could well be that other models or optimization criteria are better suited to describe muscle activation patterns for movements. The results of our simulations demonstrate that the predicted muscle activation patterns do not depend critically on the parameters in the model. This may explain why muscle activation patterns are highly stereotyped for all subjects irrespective of differences between subjects in many neuro-anatomical aspects, such as, for example, in the physiological cross-sectional area of muscle.
影响因子：
2.4
作者：
AN, KN;HUI, FC;CHAO, EY
通讯作者：
CHAO, EY