Eccentric exercise and delayed onset muscle soreness of the quadriceps induce adjustments in agonist–antagonist activity, which are dependent on the motor task

• DOI: 10.1007/s00221-011-2942-2
• Publication Date: 2011-11-17T15:33:41Z
• Authors: C. Vila-Chã; H. Hassanlouei; D. Farina; D. Falla
• Keywords: Adult; Male; Analysis of Variance; Time Factors; Electromiografia; Electromyography; Neuroscience(all); Pain; Motor Activity; Biomechanical Phenomena; Quadriceps Muscle; Young Adult; 03 medical and health sciences; 0302 clinical medicine; Fadiga neuromuscular; Isometric Contraction; Humans; Female; Exercício excêntrico; Exercise; Research Article; Muscle Contraction; Pain Measurement

This study investigates the effects of eccentric exercise and delayed onset muscle soreness (DOMS) quadriceps on agonist-antagonist activity during a range motor tasks. Ten healthy volunteers (age, mean ± SD, 24.9 3.2 years) performed maximum voluntary contractions (MVC) explosive isometric knee extensors followed by at 2.5, 5, 10, 15, 20, 30% MVC baseline, immediately after 24 h quadriceps. During each task, force surface EMG vasti hamstrings muscles were recorded concurrently. Rate development (RFD) was computed from contraction, coefficient variation (CoV) signal estimated submaximal contractions. Twenty-four hours exercise, subjects rated their perceived pain intensity as 4.1 1.2 (score out 10). The RFD reduced post- compared to baseline (average across both time points: 19.1 17.1% 11.9 9.8% lower, respectively, P < 0.05). CoV for greater (up 66% higher than 0.001) remained post-exercise presence DOMS (P 0.01). For tasks, amplitude decreased accompanied increased antagonist contraction only. On contrary, steadiness general increase in activity, but only levels (>15% MVC). shows that subsequent reduce maximal force, rate extensors, is different adjustments agonist activities.