肌肉收缩而肌纤维不缩短，即可增加肌肉的张力而不改变肌肉的长度。
缓释异搏定对静息儿茶酚胺无影响，但等长运动后仍明显升高。
In verapamil group, the plasma catecholamine concentration did not change after treatment, but it was significantly increased after isometric exercise.
已有的研究提示，一般认为等张运动导致心腔扩大，等长运动导致心肌肥厚，但在实际训练中，并不存在单纯的等张或等长训练。
It is generally acknowledged that the isotonic exercise can result in cardiac dilatation and the isometric exercise can cause myocardial pachynsis.
方法14名受试者分别参加肱二头肌和腰部脊竖肌等长运动负荷实验，取表面肌电信号进行FF T功率谱及其功率谱二维地形图分析。
Methods Static isometric loading of the biceps and low back muscle was performed in 14 subjects, using FFT power spectrum and its two dimensional mapping to analyze SEMG signals from these muscles.
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