Does stretching velocity affect residual force enhancement?
Does stretching velocity affect residual force enhancement?
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DOI：
10.1016/j.jbiomech.2019.04.033
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发表时间：
2019-05-24
影响因子：
2.4
通讯作者：
Herzog, Walter
中科院分区：
文献类型：
--
作者：
Fukutani, Atsuki;Leonard, Timothy;Herzog, Walter
认为残余力增强的大小不受拉伸速度的影响。然而，以前的研究中所研究的拉伸速度范围仅限于慢速度和中等速度。肌肉伸展的高速度与力量的丧失和与肌动蛋白的跨桥连接不完全相关，因此产生了一组独特的称为滑移的偏心情况。本研究的目的是将拉伸速度与RFE的关系推广到高速度。我们假设高速滑移可能会影响RFE。我们将猫比目鱼肌拉伸4 mm至高原力量-长度关系的速度为2、4、8、16、32，mm/S诱发RFE，并以滑行为最快状态。对于每个RFE测试，都进行了相应的等轴测参考测试。残余力增强被量化为实验拉伸和等轴测参考测试之间等轴测稳态力的相对增加。除了最快的速度(mm/S)外，所有拉伸速度的残余力增加都与预期相似，这与滑移有关，没有显著的RFE。这些结果表明，如果拉伸速度太快，并与滑移有关，RFE就会被废除。根据这些发现，我们得出结论，在偏心肌肉动作过程中，需要适当的跨桥接触才能产生RFE。(C)2019年由爱思唯尔有限公司出版。
It is thought that the magnitude of residual force enhancement (RFE) is not affected by stretch velocity. However, the range of stretch velocities studied in previous investigations has been limited to slow and moderate velocities. High velocities of muscle stretching are associated with a loss of force and incomplete cross-bridge attachment to actin, thus creating a unique set of eccentric conditions referred to as slippage. The purpose of this study was to extend the relationship between stretch velocity and RFE to high velocities. We hypothesized that slippage at high velocities might affect RFE. We stretched cat soleus muscles for 4 mm to the plateau of the force-length relationship at speeds of 2, 4, 8, 16, 32, 64 mm/s to induce RFE, and slippage for the fastest condition. For each RFE test, a corresponding isometric reference test was conducted. Residual force enhancement was quantified as the relative increase in isometric steady state force between the experimental stretch and the isometric reference tests. Residual force enhancement was similar for all stretch speeds, as expected, with the exception of the fastest speed (64 mm/s), which was associated with slippage and no significant RFE. These results suggest that if stretch speeds are too fast, and are associated with slippage, RFE is abolished. We conclude from these findings that proper cross-bridge engagement is required during eccentric muscle action to produce RFE. (C) 2019 Published by Elsevier Ltd.