大鼠骨骼肌模拟急性拉伤的生物力学实验研究

Experimental Study of Muscle Acute Strain Injury Model in Rats

根据现有肌肉急性拉伤动物模型中存在的问题,即:拉伤前肌肉的机能水平低,拉伤过程中肌肉为静息状态、拉伸速率慢、拉伸幅度大等,结合运动实践,复制了肌肉急性拉伤动物模型,并从生物力学角度进行了研究,其结果如下:1)肌肉在收缩状态下拉伤(离心工作),能够影响肌肉中肌纤维与肌鞘(结缔组织)受损比例,结缔组织受损明显增加。2)肌肉的拉伸速率快,为300％的肌纤维长度/s,明显优于其它学者的模型(6.8％～68％)肌纤维长度/s),更好地模拟运动实践中肌肉急性拉伤的状况(400％肌纤维长度/s)。3)肌肉拉伸时的幅度小,为其肌腹长度的24％,在肌肉正常生理运动范围之内;这样不仅符合运动实践中肌肉离心收缩幅度小的特点,而且在模型中也避免了肌肉邻近关节受损的可能性,从而提高了模型的质量。

There were two main differences between previous animal model of muscle acute strain (AM-MAS)and sports training practice. One was that the subjects were normal animals and the level of muscle function was lower than the trained ,the other was that the muscle was in noncontraction during stretching injury, the stretching speed was slower, and the stretching extent was larger. In this study, ANN AS was established and its biomechanical properties were revealed. The following conclusions have been drawn:1. Stretching muscle in contraction could affect the rate of injury components between muscle fiber and muscle sheaths, the injury rate of connective tissue increased. 2. The speed of muscle stretch(300% of fiber length/sec) was faster than that of the previous models(6. 8 - 68% of fiber length/sec)and better simulated muscle acute strain in sports practice(400% of fiber length/sec). 3. The extent of muscle stretch was in normal physiology and smaller, which was 24% length of muscle belly. This avoided joint injury and increased the quality of the model.