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首页> 外文会议>Biomedical Engineering Meeting, 2009. BIYOMUT 2009 >In epimuscularly connected muscle previous activity at high length yields sizable history effects causing decreased muscle force at low lengths
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In epimuscularly connected muscle previous activity at high length yields sizable history effects causing decreased muscle force at low lengths

机译：在肌肉连接的肌肉中，以前的高长度活动会产生相当大的历史效应，从而导致在短长度时肌肉力量下降

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History effects are the changes in isometric forces of muscles previously activated at high length. The aim of our study was to investigate determinants of history effects in the context of epimuscular myofascial force transmission. Isometric forces of maximally active extensor digitorum longus (EDL) muscle, as well as tibialis anterior and extensor hallicus longus muscle complex (TA+EHL) of the rat were measured simultaneously. (i) length-force (l-f) data were collected and (ii) control measurements were performed at EDL optimum (higher) length and (ii) at reference (lower) length. Between consecutive contractions muscles were allowed to recover for 2 min. History effects were quantified as Fl-f-Fcontrol for the indicated lengths. 4 conditions were studied: (1) in the intact condition, during extensor digitorum longus (EDL) lengthening, at low length of EDL, history effects were 45.49%. However, no significant effects were shown for the forces at high length of EDL and restrained TA+EHL. (2) Second control measurements taken 15 minutes after first ones showed that extra time increased the history effects (i.e. EDL proximal force decrease increased from 41.53% to 55.69%). (3) After simultaneous lengthening of EDL and TA+EHL history effects decreased by 42.12% (4) History effects decreased to 34.92% after blunt dissection and 29.56% after fasciotomy. Our study showed that history effect is a fundamental phenomenon determined by intrinsic muscle properties and epimuscular connections may change this effect.
机译：历史效应是先前在高长度时激活的肌肉的等轴测力的变化。我们研究的目的是调查在肌肌筋膜肌力传递的背景下历史影响的决定因素。同时测量大鼠的最大活动指趾长伸肌（EDL）肌肉的等轴测力以及胫骨前和伸侧拇长肌复合物（TA + EHL）。 （i）收集长度-力（l-f）数据，（ii）在EDL最佳（较高）长度下进行对照测量，并且（ii）在参考（较低）长度下进行对照测量。在连续收缩之间，允许肌肉恢复2分钟。在指定的长度内，将历史效果量化为F 1-f -F control 。研究了4个条件：（1）在完整状态下，在长指趾伸肌（EDL）延长过程中，在低长度的EDL时，病史效应为45.49％。但是，对于高长度的EDL和受约束的TA + EHL，没有显示出明显的作用力。 （2）第二次进行15分钟后进行的第二次对照测量结果显示，额外的时间增加了历史记录的影响（即EDL近端力下降从41.53％增加到55.69％）。 （3）同时延长EDL和TA + EHL的病史效果降低了42.12％（4）钝器清扫后的历史效果降低到34.92％，筋膜切开术后的历史效果降低到29.56％。我们的研究表明，历史效应是由内在的肌肉特性决定的基本现象，而肌肉连接可能会改变这种效应。

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