Tihanyi J, Apor P, Fekete G
Eur J Appl Physiol Occup Physiol. 1982;48(3):331-43. doi: 10.1007/BF00430223.
To investigate the influence of skeletal muscle fiber composition on the mechanical characteristics of human skeletal muscle under isometric and dynamic conditions, ten well-trained track athletes with different muscle compositions (m. vastus lateralis) were used. The subjects were instructed to perform maximum isometric and dynamic knee extensions at maximal speed against increasing load. To determine the mechanical properties of the knee extensors a special dynamometer was used. The load was increased by adding weight discs to the electromagnetic part of the dynamometer. The load increased from 0.33-2.33 kg2 moment of inertia in six stages. The data were handled on the basis of Hill's characteristic equation. The subjects were divided into two equal groups, one with more and one with less than 50% of fast twitch fibers. The force-velocity curve was found to be different in the two groups, the subjects with a predominance of fast twitch fibers being able to develop higher power output at a given load. Significant correlations between percentage of fast twitch fiber and power, as well as velocity, were found at the four greater loads only. However, when the percentage of fast twitch fiber and fast twitch fiber cross-sectional areas were combined, significant correlations were also found between this combined parameter and power output at the two lowest loads.
为研究骨骼肌纤维组成在等长和动态条件下对人体骨骼肌力学特性的影响，选取了10名训练有素、具有不同肌肉组成（股外侧肌）的田径运动员。受试者被要求以最大速度进行最大等长和动态伸膝动作，对抗逐渐增加的负荷。为测定伸膝肌的力学性能，使用了一种特殊的测力计。通过在测力计的电磁部分添加配重片来增加负荷。负荷分六个阶段从0.33 - 2.33 kg²转动惯量增加。数据依据希尔特性方程进行处理。受试者被分为两组，每组人数相等，一组快肌纤维比例超过50%，另一组低于50%。结果发现两组的力 - 速度曲线不同，快肌纤维占优势的受试者在给定负荷下能够产生更高的功率输出。仅在四个较大负荷下，快肌纤维百分比与功率以及速度之间存在显著相关性。然而，当将快肌纤维百分比和快肌纤维横截面积相结合时，在两个最低负荷下，该组合参数与功率输出之间也存在显著相关性。
