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本文报道了5名被试者在7周等动力量训练前后肌肉中酶的活性与肌纤维类型组成的变化。在训练中,被试者的一条腿作每次持续6秒钟的最大伸膝运动,重复10次;而另一条腿则作每次持续30秒钟的最大伸膝运动,重复1次。所以,实际上两腿所做的总工作量是相等的。每周训练4次。7周训练结束后,以训练速度(3.14半径/秒)或低于训练速度进行测验,发现两条腿获得最大力距是相同的;此外,还用60秒钟运动试验来检查训练后伸膝肌的易疲劳性,结果表明,两条腿的易疲劳性也是相似的。肌肉活组织检查表明,这两种力量训练的安排导致Ⅰ型和Ⅱα型肌纤维的面积百分比发生显著的改变。而肌肉中的酶活性的变化则只有以30秒钟训练的那条腿的肌肉中的糖酵介酶、三磷酸腺苷-磷酸肌酸水介酶和线粒体氧化酶的活性升高。尽管发现这些变化,但这些变化中没有一种变化是与肌肉最大等动收缩时力量的增加或肌肉的易疲劳性有关。
This article reports the changes of muscle enzyme activity and muscle fiber composition in 5 subjects before and after 7-week isokinetic training. During the training, one leg of the subject was subjected to the maximum knee extension lasting 6 seconds each time for 10 times, while the other leg was subjected to the maximum extension knee movement lasting 30 seconds each time. So, in fact, the total amount of work done by both legs is equal. Train 4 times a week. After 7 weeks of training, the test was conducted at training speed (3.14 radians / second) or less than the training speed, and it was found that the maximum torque obtained by both legs was the same. In addition, a 60-second exercise test was also used to check the knee extension Muscle fatigue, the results show that the two legs of the fatigue is also similar. Muscle biopsies showed that these two strength training arrangements resulted in significant changes in the area percentage of type I and type II a muscle fibers. Changes in muscle enzyme activity, however, were associated with increased activity of the enzymes glycolithinase, adenosine triphosphate-creatine phosphodiesterase and mitochondrial oxidase in the muscle of the leg trained in 30 seconds. Despite these changes, none of these changes have been linked to increased strength at maximal isokinetic muscle contraction or muscle fatigue.