Pinto J G, Boe A
Department of Mechanical Engineering, San Diego State University, California 92182-0191.
J Biomech Eng. 1991 Feb;113(1):72-8. doi: 10.1115/1.2894087.
There is concern among researchers whether the passive muscle properties, characterized by purely passive material testing procedures, are an appropriate representation of the actual passive component of the muscle. This aspect is of particular importance in the biomechanical analysis of heart muscle response where it is generally agreed that the so-called parallel elasticity cannot be ignored as is done justifiably in the analysis of skeletal muscle response. In the present article, a method of quantifying the passive elasticity in contracting muscle bundles is presented. The method consists of imposing isometric transients (such as the quick-stretch or quick release) on a muscle bundle during the contraction phase and observing the differences in decayed force levels between a normal twitch and that of a perturbed twitch. The proposed method provides a means of obtaining useful passive properties from contracting muscle bundles and circumvents the difficulty of having to characterize muscle properties from separate experiments on quiescent muscle bundles.
研究人员担心，通过纯被动材料测试程序表征的被动肌肉特性是否能恰当地代表肌肉的实际被动成分。这一方面在心肌反应的生物力学分析中尤为重要，在该分析中，人们普遍认为，所谓的平行弹性不能像在骨骼肌反应分析中那样被合理地忽略。在本文中，提出了一种量化收缩肌束中被动弹性的方法。该方法包括在收缩阶段对肌束施加等长瞬变（如快速拉伸或快速释放），并观察正常抽搐和受扰抽搐之间衰减力水平的差异。所提出的方法提供了一种从收缩肌束中获得有用被动特性的手段，避免了必须通过对静态肌束进行单独实验来表征肌肉特性的困难。
