Tags

Type your tag names separated by a space and hit enter

Neuromuscular activation of vastus intermedius muscle during fatiguing exercise.
J Electromyogr Kinesiol. 2010 Aug; 20(4):661-6.JE

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.

Authors+Show Affiliations

Graduate School of Education and Human Development, Nagoya University, 1 Furo, Chikusa, Nagoya Aichi, Japan. kwatanabe@nagoya-u.jpNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20133154

Citation

Watanabe, Kohei, and Hiroshi Akima. "Neuromuscular Activation of Vastus Intermedius Muscle During Fatiguing Exercise." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 20, no. 4, 2010, pp. 661-6.
Watanabe K, Akima H. Neuromuscular activation of vastus intermedius muscle during fatiguing exercise. J Electromyogr Kinesiol. 2010;20(4):661-6.
Watanabe, K., & Akima, H. (2010). Neuromuscular activation of vastus intermedius muscle during fatiguing exercise. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 20(4), 661-6. https://doi.org/10.1016/j.jelekin.2010.01.003
Watanabe K, Akima H. Neuromuscular Activation of Vastus Intermedius Muscle During Fatiguing Exercise. J Electromyogr Kinesiol. 2010;20(4):661-6. PubMed PMID: 20133154.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Neuromuscular activation of vastus intermedius muscle during fatiguing exercise. AU - Watanabe,Kohei, AU - Akima,Hiroshi, Y1 - 2010/02/04/ PY - 2009/08/28/received PY - 2010/01/05/revised PY - 2010/01/15/accepted PY - 2010/2/6/entrez PY - 2010/2/6/pubmed PY - 2010/8/27/medline SP - 661 EP - 6 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 20 IS - 4 N2 - 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. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/20133154/Neuromuscular_activation_of_vastus_intermedius_muscle_during_fatiguing_exercise_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(10)00004-0 DB - PRIME DP - Unbound Medicine ER -