Proske U, Rack P M
Am J Physiol. 1976 Aug;231(2):449-53. doi: 10.1152/ajplegacy.1976.231.2.449.
The semitendinous muscle of the lizard Tilique contains both slow and twitch fibers; by subdivision of its motor nerve, fibers of each type may be stimulated separately. When, during repetitive stimulation of nerve filaments, the muscle was lengthened or shortened, the tension changes included an initial short-range stiffness, followed by a later compliance. With increasing velocities of movement, the short-range stiffness increased toward a limiting value. For slow fibers this limiting value was reached with lower velocities of movement than for the twitch fibers. Provided that the same velocity of movement was used and the movements began from similar initial isometric tensions, the slow fibers resisted the movements with a greater stiffness than the twitch fibers. It is suggested that not all of the observed differences between the two fiber types can be interpreted simply in terms of differences in rates of formation and breakdown of cross-links.
蜥蜴蒂利克半腱肌包含慢肌纤维和快肌纤维；通过细分其运动神经，可分别刺激每种类型的纤维。在重复刺激神经纤维时，当肌肉被拉长或缩短，张力变化包括初始的短程僵硬，随后是顺应性。随着运动速度增加，短程僵硬朝着极限值增加。对于慢肌纤维，达到该极限值所需的运动速度低于快肌纤维。如果使用相同的运动速度且运动从相似的初始等长张力开始，慢肌纤维比快肌纤维以更大的僵硬程度抵抗运动。有人提出，不能简单地用交联形成和分解速率的差异来解释两种纤维类型之间观察到的所有差异。
