期刊
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
卷 20, 期 4, 页码 661-666出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jelekin.2010.01.003
关键词
Quadriceps femoris; Knee extensor muscles; Synergistic muscles; Surface electromyography; Fatigue; Isometric contraction
资金
- Suzuken Memorial Foundation
- Casio Science Promotion Foundation
The purpose of this study was to investigate neuromuscular activation of the vastus intermedius (VI) muscle during fatiguing contraction. Seven healthy men performed sustained isometric knee extension exercise at 50% of maximal voluntary contraction until exhaustion. During the fatiguing task, surface electromyograms (EMGs) were recorded from four muscle components of the quadriceps femoris muscle group: VI; vastus lateralis (VL); vastus medialis (VM); and rectus femoris (RF) muscles. For the VI muscle, our recently developed technique was used. Root mean square (RMS) and median frequency (MF) of the surface EMG signal were calculated and these variables were then normalized by the value at the beginning of the task. Normalized RMS of the VI muscle resembled those of the other three muscles at all given times. At 95% of exhaustion time, normalized MF of the VI muscle was significantly higher than that of the VL muscle (p < 0.05). These results suggested that neuromuscular activation is not consistent between the VI and VL muscles at the exhaustion for isometric submaximal contraction and this could reflect the dissimilar intramuscular metabolism between these muscles. (C) 2010 Elsevier Ltd. All rights reserved.
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