Toyoki T, Tsuchiya T, Tameyasu T, Sugi H
Jpn J Physiol. 1985;35(5):709-15. doi: 10.2170/jjphysiol.35.709.
To study the mechanism of the longitudinal stability at the level of whole muscles, paired frog sartorius muscles were attached to the opposite lever arms at unequal distances from the pivot. The lever was initially fixed in position, and when the full isometric forces were developed in both muscles, it was released to move, the result being that the advantaged muscle shortened by stretching the disadvantaged one with a nearly constant velocity depending on the ratio between their points of attachment from the pivot. The force-velocity relation of the advantaged muscle was virtually identical with the ordinary force-velocity relation obtained from the isotonic release experiments, while the force-velocity relation of the disadvantaged muscle was found to be entirely different from the ordinary one because of a marked increase in the load-bearing ability. These results are discussed in connection with the enhancement of mechanical performance in lengthening muscle.
为了研究整块肌肉水平上的纵向稳定性机制，将成对的青蛙缝匠肌附着在离枢轴不等距离的相对杠杆臂上。杠杆最初固定在一个位置，当两块肌肉都产生最大等长力时，松开杠杆使其移动，结果是优势肌肉通过以几乎恒定的速度拉伸劣势肌肉而缩短，该速度取决于它们在枢轴上附着点之间的比例。优势肌肉的力-速度关系实际上与等张释放实验中得到的普通力-速度关系相同，而劣势肌肉的力-速度关系由于承载能力的显著增加而与普通关系完全不同。结合拉长肌肉时机械性能的增强对这些结果进行了讨论。
