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Effect of knee joint angle on neuromuscular activation of the vastus intermedius muscle during isometric contraction.
Scand J Med Sci Sports. 2011 Dec; 21(6):e412-20.SJ

Abstract

The purpose of this study was to compare the relationship between surface electromyography (EMG) and knee joint angle of the vastus intermedius muscle (VI) with the synergistic muscles in the quadriceps femoris (QF) muscle group. Fourteen healthy men performed maximal voluntary contractions during isometric knee extension at four knee joint angles from 90°, 115°, 140°, and 165° (180° being full extension). During the contractions, surface EMG was recorded at four muscle components of the QF muscle group: the VI, vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) muscles. The root mean square of the surface EMG at each knee joint angle was calculated and normalized by that at a knee joint angle of 90° for individual muscles. The normalized RMS of the VI muscle was significantly lower than those of the VL and RF muscles at the knee joint angles of 115° and 165° and those of the VL, VM, and RF muscles at the knee joint angle of 140° (P<0.05). The present results suggest that the neuromuscular activation of the VI muscle is regulated in a manner different from the alteration of the knee joint angle compared with other muscle components of the QF muscle group.

Authors+Show Affiliations

Laboratory of Applied Physiology, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan. watanabe.kohei@aw7.ecs.kyoto-u.ac.jpNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21672026

Citation

Watanabe, K, and H Akima. "Effect of Knee Joint Angle On Neuromuscular Activation of the Vastus Intermedius Muscle During Isometric Contraction." Scandinavian Journal of Medicine & Science in Sports, vol. 21, no. 6, 2011, pp. e412-20.
Watanabe K, Akima H. Effect of knee joint angle on neuromuscular activation of the vastus intermedius muscle during isometric contraction. Scand J Med Sci Sports. 2011;21(6):e412-20.
Watanabe, K., & Akima, H. (2011). Effect of knee joint angle on neuromuscular activation of the vastus intermedius muscle during isometric contraction. Scandinavian Journal of Medicine & Science in Sports, 21(6), e412-20. https://doi.org/10.1111/j.1600-0838.2011.01347.x
Watanabe K, Akima H. Effect of Knee Joint Angle On Neuromuscular Activation of the Vastus Intermedius Muscle During Isometric Contraction. Scand J Med Sci Sports. 2011;21(6):e412-20. PubMed PMID: 21672026.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of knee joint angle on neuromuscular activation of the vastus intermedius muscle during isometric contraction. AU - Watanabe,K, AU - Akima,H, Y1 - 2011/06/15/ PY - 2011/6/16/entrez PY - 2011/6/16/pubmed PY - 2012/5/2/medline SP - e412 EP - 20 JF - Scandinavian journal of medicine & science in sports JO - Scand J Med Sci Sports VL - 21 IS - 6 N2 - The purpose of this study was to compare the relationship between surface electromyography (EMG) and knee joint angle of the vastus intermedius muscle (VI) with the synergistic muscles in the quadriceps femoris (QF) muscle group. Fourteen healthy men performed maximal voluntary contractions during isometric knee extension at four knee joint angles from 90°, 115°, 140°, and 165° (180° being full extension). During the contractions, surface EMG was recorded at four muscle components of the QF muscle group: the VI, vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) muscles. The root mean square of the surface EMG at each knee joint angle was calculated and normalized by that at a knee joint angle of 90° for individual muscles. The normalized RMS of the VI muscle was significantly lower than those of the VL and RF muscles at the knee joint angles of 115° and 165° and those of the VL, VM, and RF muscles at the knee joint angle of 140° (P<0.05). The present results suggest that the neuromuscular activation of the VI muscle is regulated in a manner different from the alteration of the knee joint angle compared with other muscle components of the QF muscle group. SN - 1600-0838 UR - https://www.unboundmedicine.com/medline/citation/21672026/Effect_of_knee_joint_angle_on_neuromuscular_activation_of_the_vastus_intermedius_muscle_during_isometric_contraction_ L2 - https://doi.org/10.1111/j.1600-0838.2011.01347.x DB - PRIME DP - Unbound Medicine ER -