股四头肌低频疲劳和肌肉疼痛与收缩类型有关。
Quadriceps low-frequency fatigue and muscle pain are contraction-type-dependent.
机构信息
Graduate Program in Physical Therapy and Rehabilitation Science, Carver College of Medicine, University of Iowa, 1-252 Medical Education Building, Iowa City, Iowa 52242-1190, USA.
出版信息
Muscle Nerve. 2010 Aug;42(2):230-8. doi: 10.1002/mus.21679.
Abstract
Eccentric contractions are thought to induce greater low-frequency fatigue (LFF) and delayed-onset muscle soreness (DOMS) than concentric contractions. In this study we induced a similar amount of eccentric quadriceps muscle fatigue during either a concentric or eccentric fatigue task to compare LFF and DOMS. Subjects (n = 22) performed concentric or eccentric fatigue tasks using 75% of the pre-fatigue maximal voluntary contraction (MVC) torque, and both tasks ended when the MVC eccentric torque decreased by 25% pre-fatigue. When subjects reached the failure criterion during the eccentric and concentric tasks, the concentric MVC was 78 +/- 9.8% and 64 +/- 8.4% of initial, respectively. LFF was greater after the concentric than the eccentric protocols (22 +/- 12.4% and 15 +/- 7.6% increase, respectively; P < 0.01). DOMS was over 100% greater for the eccentric protocol. These results indicate that DOMS is not dependent on the events that contribute to LFF.
摘要
离心收缩被认为比向心收缩更能引起低频疲劳（LFF）和延迟性肌肉酸痛（DOMS）。在这项研究中，我们在向心或离心疲劳任务中引起相似量的离心股四头肌疲劳，以比较 LFF 和 DOMS。受试者（n = 22）使用 75%的预疲劳最大自主收缩（MVC）扭矩进行向心或离心疲劳任务，并且当 MVC 离心扭矩比预疲劳减少 25%时，两个任务均结束。当受试者在离心和向心任务中达到失效标准时，离心 MVC 分别为初始值的 78 +/- 9.8%和 64 +/- 8.4%。与离心方案相比，向心方案后的 LFF 更高（分别增加 22 +/- 12.4%和 15 +/- 7.6%；P < 0.01）。离心方案的 DOMS 超过 100%。这些结果表明，DOMS 不依赖于导致 LFF 的事件。
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