Neuromuscular activation of vastus intermedius muscle during fatiguing exercise

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
Kohei Watanabe, Hiroshi Akima

Abstract

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.

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Citations

Sep 17, 2013·European Journal of Applied Physiology·Hiroshi Akima, Akira Saito
Mar 16, 2013·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Akira SaitoHiroshi Akima
Oct 15, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Kohei WatanabeToshio Moritani
Apr 6, 2011·Journal of Neuroscience Methods·Kohei Watanabe, Hiroshi Akima
Nov 26, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Aya TomitaHiroshi Akima
Jun 5, 2013·Muscle & Nerve·Kohei WatanabeToshio Moritani
Jun 16, 2011·Scandinavian Journal of Medicine & Science in Sports·K Watanabe, H Akima
Jul 24, 2012·Journal of Science and Medicine in Sport·Mark E T Willems, James P G Ponte
Oct 1, 2013·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Akira Saito, Hiroshi Akima
Dec 27, 2011·Journal of Biomechanics·Roger M Enoka
Nov 24, 2017·International Journal of Adolescent Medicine and Health·Yuta Sekine, Norikazu Hirose

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