MECHANICAL PROPERTIES OF SEMITENDINOSUS MUSCLE AT LENGTHS GREATER THAN ITS LENGTH IN BODY
MECHANICAL PROPERTIES OF SEMITENDINOSUS MUSCLE AT LENGTHS GREATER THAN ITS LENGTH IN BODY
复制标题
DOI：
10.1113/jphysiol.1961.sp006761
复制
发表时间：
1961-01-01
影响因子：
5.5
通讯作者：
DELEZE, JB
中科院分区：
文献类型：
--
作者：
DELEZE, JB
伸展导致的等长张力发展的减少常常被解释为肌动蛋白和肌球蛋白丝之间重叠面积的减少。如果这是真的，其他收缩现象也应该以同样的方式变化。实验是在青蛙的半腱肌上进行的，因为在这块肌肉中，张力-长度曲线的下降部分非常明显。当强直肌肉在该区域以恒定速度伸长时，张力不会福尔斯下降，而总是上升;在运动结束时，只要刺激继续，张力就保持在等长水平之上;当强直肌肉以恒定速度缩短时，记录到一系列类似于等长张力-长度曲线的动态张力-长度曲线。张力和长度之间的关系对于等长收缩和等张收缩是相同的，只是在一定的长度范围内。拉伸静止的肌肉会降低其缩短或随后产生张力的能力;这种效果在恢复原始长度后会持续一段时间。
The diminution in isometric tension development resulting from extension has often been explained in terms of a decreased area of overlap between actin and myosin filaments. If this is true, other phenomena of contraction should vary in the same way. The experiments were performed on the frog semitendinosus, because in this muscle the falling part of the tension-length curve is very pronounced. When the tetanized muscle is lengthened at constant speed in this region, tension never falls but always rises; at the end of the movement tension stays above the isometric level as long as stimulation goes on. When the tetanized muscle is allowed to shorten at constant speed, a series of dynamic tension-length curves similar to the isometric tension-length curve are recorded. The relation between tension and length is the same for isometric and isotonic contractions within certain limits of length only. Stretching the resting muscle decreases its ability to shorten or develop tension subsequently; this effect persists for some time after returning to the original length.