PAIN AND FATIGUE AFTER CONCENTRIC AND ECCENTRIC MUSCLE CONTRACTIONS
PAIN AND FATIGUE AFTER CONCENTRIC AND ECCENTRIC MUSCLE CONTRACTIONS
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DOI：
10.1042/cs0640055
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发表时间：
1983-01-01
期刊：
影响因子：
6
通讯作者：
EDWARDS, RHT
中科院分区：
文献类型：
--
作者：
NEWHAM, DJ;MILLS, KR;EDWARDS, RHT
正常受试者进行台阶试验，其中一条腿的股四头肌同心收缩，而对侧肌肉偏心收缩。最大自愿力和力：频率的关系被改变双边作为一个结果的练习，变化更大的肌肉收缩偏心。在24小时内恢复。在每块肌肉上使用3个部位的肌电图研究表明，在运动期间，只有在偏心收缩的肌肉中的电激活增加。恢复遵循类似的收缩性能的时间过程。疼痛和触痛只发生在异常收缩的肌肉上。首先注意到疼痛。在运动后8小时，并且在apprx时最大。48小时后，在这个时候，力的产生和电激活已恢复到运动前的值。离心收缩比同心收缩在肌肉功能的某些方面引起更深刻的变化。这些变化不能用简单的代谢术语来解释。它们可能是离心收缩期间在相对较少的活性纤维中产生的高张力引起的机械创伤的结果。
Normal subjects performed a step test in which the quadriceps of 1 leg contracted concentrically while the contralateral muscle contracted eccentrically. Maximum voluntary force and the force:frequency relationship were altered bilaterally as a result of the exercise, the changes being greater in the muscle which had contracted eccentrically. Recovery occurred over 24 h. Electromyographic studies using 3 sites on each muscle showed an increase in electrical activation during the exercise only in the muscle which was contracting eccentrically. Recovery followed a time course similar to that of the contractile properties. Pain and tenderness developed only in the muscle which had contracted eccentrically. Pain was first noted .apprx. 8 h after exercise and was maximal at .apprx. 48 h after exercise, at which time force generation and electrical activation had returned to preexercise values. Eccentric contractions cause more profound changes in some aspects of muscle function than concentric contractions. These changes cannot be explained in simple metabolic terms. They may be the result of mechanical trauma caused by the high tension generated in relatively few active fibers during eccentric contractions.