Contraction-induced injury to single muscle fibers: velocity of stretch does not influence the force deficit.

Contraction-induced injury to single muscle fibers: velocity of stretch does not influence the force deficit.
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收缩引起的单肌纤维损伤:拉伸速度不影响力不足。

DOI:
10.1152/ajpcell.1998.275.6.c1548
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发表时间:
1998
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Faulkner,JA
Faulkner,JA
中科院分区:
--
文献类型:
--
作者:
Lynch,GS;Faulkner,JA

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我们测试了一个无效假设,即单个肌肉纤维在一次伸展后的损伤程度与拉伸速度无关。从大鼠指长伸肌获得的每一根通透性纤维被最大限度地激活,然后以0.5、1.0或2.0Lf/S的速度暴露于5、10或20%应变[纤维长度(Lf)的%]的单次拉伸。拉力不足,即拉伸前后的最大强直等长力(Po)之差,以拉伸前Po值的控制值的百分比表示,提供了对肌肉损伤程度的估计。尽管从最低速度到最高速度有四倍的范围,但同一应变的不同伸展段之间的力量赤字并没有什么不同。在应变为20%的拉伸条件下,尽管40%的纤维以4Lf/S的速度被撕裂,但即使在8倍的速度范围内,收缩损伤的程度也没有差异。我们得出结论,在单根渗透纤维所能承受的速度范围内,收缩损伤的严重程度与拉伸速度无关。
We tested the null hypothesis that the severity of injury to single muscle fibers following a single pliometric (lengthening) contraction is not dependent on the velocity of stretch. Each single permeabilized fiber obtained from extensor digitorum longus muscles of rats was maximally activated and then exposed to a single stretch of either 5, 10, or 20% strain [% of fiber length (Lf)] at a velocity of 0.5, 1.0, or 2.0Lf/s. The force deficit, the difference between maximum tetanic isometric force (Po) before and after the stretch expressed as a percentage of the control value for Pobefore the stretch, provided an estimate of the magnitude of muscle injury. Despite a fourfold range from the lowest to the highest velocities, force deficits were not different among stretches of the same strain. At stretches of 20% strain, even an eightfold range of velocities produced no difference in the force deficit, although 40% of the fibers were torn apart at a velocity of 4Lf/s. We conclude that, within the range of velocities tolerated by single permeabilized fibers, the severity of contraction-induced injury is not related to the velocity of stretch.
受刺激的青蛙肌肉纤维的硬度和丝重叠之间的关系。
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