WHY ANIMALS HAVE DIFFERENT MUSCLE-FIBER TYPES
WHY ANIMALS HAVE DIFFERENT MUSCLE-FIBER TYPES
复制标题
DOI：
10.1038/335824a0
复制
发表时间：
1988-10-27
期刊：
影响因子：
64.8
通讯作者：
FREADMAN, M
中科院分区：
文献类型：
--
作者：
ROME, LC;FUNKE, RP;FREADMAN, M
动物有不同的肌肉纤维类型：慢纤维最大缩短速度(Vmax)低，快纤维Vmax高。在运动过程中使用不同类型的纤维1所带来的优势完全是基于它们的体外特性。离体肌实验表明，力的产生、机械功率的产生和效率都是V/Vmax的函数，其中V是肌肉缩短的速度。但目前尚不清楚动物是否真的以缩短速度使用不同的纤维，这种速度对机械动力的产生和效率是最佳的。在这里，我们将运动过程中肌肉纤维的Vmax与它们的Vmax进行比较。这一比较表明，在慢速运动中，慢速纤维以提供最大机械功率和效率的速度缩短，而快速纤维在为最大运动提供动力时以其最佳速度缩短。我们的结果还表明，没有快纤维，最大的运动是不可能的，因为慢纤维不能足够快地缩短。
Animals have different muscle fibre types: slow fibres with a low maximum velocity of shortening (Vmax) and fast fibres with a highVmax. An advantage conferred by the use of different fibre types during locomotion1has been proposed solely on the basis of theirin vitroproperties. Isolated muscle experiments show that force generation, mechanical power production and efficiency are all functions ofV/Vmax, whereVis the velocity of muscle shortening. But it is not known whether animals actually use the different fibres at shortening velocities that are optimal for mechanical power production and efficiency. Here we compare theVof muscle fibres during locomotion with theirVmax. This comparison shows that during slow locomotion, the slow fibres shorten at a velocity that gives peak mechanical power and efficiency and the fast fibres shorten at their optimal velocity when powering maximal movements. Our results also show that maximal movements are impossible without fast fibres because the slow ones cannot shorten rapidly enough.