Myofilament overlap in swimming carp. II. Sarcomere length changes during swimming.
Myofilament overlap in swimming carp. II. Sarcomere length changes during swimming.
复制标题
游泳鲤鱼的肌丝重叠。
DOI：
10.1152/ajpcell.1991.260.2.c289
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Sosnicki,AA
中科院分区：
文献类型：
--
作者：
Rome,LC;Sosnicki,AA
这项研究的目的是确定鲤鱼游泳时肌丝的重叠情况。通过使用冰冻切片，我们发现红色和白色肌肉的肌节长度可能与脊柱的曲率有关。游泳时的肌节长度（SL）是通过对高速运动图片中的脊柱曲率进行分析来计算的。由于鲤鱼的肌丝长度与青蛙相同，因此我们使用青蛙 SL 张力曲线将力的产生与 SL 相关联。在低速游动时，红色纤维的 SL 为 1.91-2.22 微米，计算得出的力产生不少于最大 96%。如果红色纤维为逃逸反应提供动力，它们必须缩短至 1.45-1.55 微米，此时产生的力将减少至最大约 50%，并且纤维会损坏。相反，白色肌肉纤维被募集，并且由于其螺旋方向（导致更高的传动比），它们缩短至仅 1.75 微米，在该处它们产生不少于 85% 的最大张力。因此，通过招募具有不同方向的纤维类型，全方位的运动由几乎最大重叠的纤维提供动力。这表明肌丝重叠是肌肉系统的重要设计约束。
This study was performed to determine myofilament overlap during swimming in carp. By using frozen sections, we found that sarcomere lengths of the red and white muscle could be related to the curvature of the backbone. Sarcomere length (SL) during swimming was calculated from an analysis of backbone curvature in high-speed motion pictures. Because carp have the same myofilament lengths as frogs, we related force generation to SL using the frog SL-tension curve. At slow swimming speeds, the red fibers are used at a SL of 1.91-2.22 microns, where force generation is calculated to be no less than 96% maximal. If the red fibers powered the escape response they would have to shorten to 1.45-1.55 microns, where force generation would be reduced to approximately 50% maximal and the fibers damaged. Instead, the white muscle fibers are recruited and because of their helical orientation (resulting in a higher gear ratio), they shorten to only 1.75 microns, where they generate no less than 85% maximal tension. Thus, by recruitment of fiber types with different orientations, the full range of movements is powered by fibers operating at nearly maximal overlap. This suggests that myofilament overlap is an important design constraint of muscular systems.
登录
查看更多内容
影响因子：
64.8
作者：
ROME, LC;FUNKE, RP;FREADMAN, M
通讯作者：
FREADMAN, M
DOI：
10.1113/jphysiol.1990.sp018165
发表时间：
1990
期刊：
The Journal of physiology
影响因子：
--
作者：
Rome,LC;Sosnicki,AA
通讯作者：
Sosnicki,AA
温度对鲤鱼游泳肌肉速度和持续性能的影响。
DOI：
10.1242/jeb.154.1.163
发表时间：
1990
期刊：
The Journal of experimental biology
影响因子：
--
作者：
Rome,LC;Funke,RP;Alexander,RM
通讯作者：
Alexander,RM
影响因子：
5.5
作者：
GORDON, AM;HUXLEY, AF;JULIAN, FJ
通讯作者：
JULIAN, FJ
DOI：
10.1017/s0025315400035906
发表时间：
1969-01-01
影响因子：
1.2
作者：
ALEXANDE.RM
通讯作者：
ALEXANDE.RM