划幅小―果划程比所需要的短，就会过多地引起肌肉紧缩，因而使肌纤维膜过度紧张和疼痛。

Lack of Stroke Length- strokes that are shorter than what is required cause too many contractions and therefore excessive muscle fatigue and pain.

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结果：在第2和第4周时肌纤维变性、水肿，肌膜破坏等病理变化明显；

Muscular pathological changes were observed. Results:The evident denaturation, edema and destruction of muscle cell could be observed in the 2nd and 4th week.

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循环儿茶酚胺升高对心肌细胞产生直接的毒性作 用、增加膜通透性和心肌纤维化，这些作用可引起细胞死亡。

The increase of circulating catecholamines exerts direct toxic effect on cardiac myocytes, increases membrane permeability and myocardial fibrosis;

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