期刊
MUSCLE & NERVE
卷 42, 期 2, 页码 230-238出版社
WILEY-BLACKWELL
DOI: 10.1002/mus.21679
关键词
concentric; delayed-onset muscle soreness; eccentric; excitation-contraction coupling; low frequency fatigue; muscle damage; muscle fatigue
资金
- National Institutes of Health [R01-NR 010285-05]
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. Muscle Nerve 42:230-238, 2010
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