Region-specific myoelectric manifestations of fatigue in human rectus femoris muscle
Article first published online: 4 JUN 2013
© 2013 Wiley Periodicals, Inc.
Muscle & Nerve
Volume 48, Issue 2, pages 226–234, August 2013
How to Cite
Watanabe, K., Kouzaki, M. and Moritani, T. (2013), Region-specific myoelectric manifestations of fatigue in human rectus femoris muscle. Muscle Nerve, 48: 226–234. doi: 10.1002/mus.23739
- Issue published online: 23 JUL 2013
- Article first published online: 4 JUN 2013
- Accepted manuscript online: 29 NOV 2012 11:18PM EST
- Manuscript Accepted: 26 NOV 2012
- Grant-Aid for Japan Society for the Promotion of Science. Grant Number: 22-1944
- bi-articular muscle;
- high-density surface electromyography;
- Median frequency;
- multi-channel surface electromyography;
- Neuromuscular compartment
Anatomical properties between proximal and other regions within the human rectus femoris (RF) muscle are nonuniform. We aimed to clarify the possible region-specific myoelectric manifestations of fatigue within the RF muscle by using an advanced surface electromyography (SEMG) technique.
Nine healthy men performed sustained contractions at 50% of maximal voluntary contraction until exhaustion during isometric knee extension and hip flexion. During these contractions, multi-channel SEMG was recorded from the RF by using 46 electrode pairs which cover most of the superficial area of the muscle.
Fatigue-induced SEMG, i.e., an increase in root mean square and a decrease in median frequency, was not uniform within the muscle during both tasks and was greater in proximal regions.
Our findings suggest that myoelectric manifestations of fatigue within the human RF muscle are localized, and proximal regions are more fatigable than other regions within this muscle. Muscle Nerve, 48: 226–234, 2013