Neuromuscular activation of vastus intermedius muscle during fatiguing exercise |
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| Authors: | Kohei Watanabe Hiroshi Akima |
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| Institution: | 1. Graduate School of Education and Human Development, Nagoya University, 1 Furo, Chikusa, Nagoya Aichi 464-8601, Japan;2. Research Center of Health, Physical Fitness & Sports, Nagoya University, 1 Furo, Chikusa, Nagoya Aichi 464-8601, Japan;1. EA 4334 “Motricité, Interactions, Performance”, UFR STAPS, University of Nantes, Nantes, France;2. The University of Queensland, NHMRC Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Sciences, Brisbane, Australia;3. Supersonic Imagine, Aix en Provence, France;1. Human Health Sciences, Graduate School of Medicine, Kyoto University, Japan;2. Faculty of Health and Sports Science, Doshisha University, Kyoto, Japan;1. John A. Paulson School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, USA;2. College of Arts and Sciences, Department of Psychology, Ohio University, USA;3. School of Rehabilitation and Communication Sciences, Division of Physical Therapy, Ohio University, USA;4. School of Physical & Occupational Therapy, Department of Kinesiology and Physical Education, McGill University, Canada;1. Department of Sports and Life Sciences, National Institute of Fitness and Sports in Kanoya, 1 Shiromizu, Kanoya, Kagoshima 8912393, Japan;2. School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia;3. Graduate School of Engineering and Science, Shibaura Institute of Technology, Minuma-ku, Saitama-shi, Saitama 3378570, Japan;4. Research Fellow of Japan Society for the Promotion of Science, Tokyo, Japan;1. Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, Japan;2. Graduate School of Education and Human Development, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan;3. Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo, Japan;4. Research Center of Health, Physical Fitness & Sports, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan;1. Department of Physical Therapy, Faculty of Health and Welfare, Tokushima Bunri University, Tokushima, Tokushima, Japan;2. Department of Rehabilitation, Kasei Tamura Hospital, Wakayama, Wakayama, Japan;3. Life and Medical Sciences Area, Health Sciences Discipline, Kobe University, Kobe, Hyogo, Japan |
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| 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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