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The highest antagonistic coactivation of the vastus intermedius muscle among quadriceps femoris muscles during isometric knee flexion.
J Electromyogr Kinesiol. 2013 Aug; 23(4):831-7.JE

Abstract

Although the possibility that the vastus intermedius (VI) muscle contributes to flexion of the knee joint has been suggested previously, the detail of its functional role in knee flexion is not well understood. The purpose of this study was to examine the antagonist coactivation of VI during isometric knee flexion. Thirteen men performed 25-100% of maximal voluntary contraction (MVC) at 90°, 120°, and 150° knee joint angles. Surface electromyography (EMG) of the four individual muscles in the quadriceps femoris (QF) was recorded and normalized by the EMG signals during isometric knee extension at MVC. Cross-talk on VI EMG signal was assessed based on the median frequency response to selective cooling of hamstring muscles. Normalized EMG of the VI was significantly higher than that of the other synergistic QF muscles at each knee joint angle (all P<0.05) with minimum cross-talk from the hamstrings to VI. There were significant correlations between the EMG signal of the hamstrings and VI (r=0.55-0.85, P<0.001). These results suggest that VI acts as a primary antagonistic muscle of QF during knee flexion, and that VI is presumably a main contributor to knee joint stabilization.

Authors+Show Affiliations

Graduate School of Education and Human Development, Nagoya University, Japan. a-saito@nagoya-u.jpNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

23489717

Citation

Saito, Akira, et al. "The Highest Antagonistic Coactivation of the Vastus Intermedius Muscle Among Quadriceps Femoris Muscles During Isometric Knee Flexion." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 23, no. 4, 2013, pp. 831-7.
Saito A, Watanabe K, Akima H. The highest antagonistic coactivation of the vastus intermedius muscle among quadriceps femoris muscles during isometric knee flexion. J Electromyogr Kinesiol. 2013;23(4):831-7.
Saito, A., Watanabe, K., & Akima, H. (2013). The highest antagonistic coactivation of the vastus intermedius muscle among quadriceps femoris muscles during isometric knee flexion. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 23(4), 831-7. https://doi.org/10.1016/j.jelekin.2013.02.005
Saito A, Watanabe K, Akima H. The Highest Antagonistic Coactivation of the Vastus Intermedius Muscle Among Quadriceps Femoris Muscles During Isometric Knee Flexion. J Electromyogr Kinesiol. 2013;23(4):831-7. PubMed PMID: 23489717.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The highest antagonistic coactivation of the vastus intermedius muscle among quadriceps femoris muscles during isometric knee flexion. AU - Saito,Akira, AU - Watanabe,Kohei, AU - Akima,Hiroshi, Y1 - 2013/03/09/ PY - 2012/09/27/received PY - 2013/02/04/revised PY - 2013/02/13/accepted PY - 2013/3/16/entrez PY - 2013/3/16/pubmed PY - 2014/2/4/medline SP - 831 EP - 7 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 23 IS - 4 N2 - Although the possibility that the vastus intermedius (VI) muscle contributes to flexion of the knee joint has been suggested previously, the detail of its functional role in knee flexion is not well understood. The purpose of this study was to examine the antagonist coactivation of VI during isometric knee flexion. Thirteen men performed 25-100% of maximal voluntary contraction (MVC) at 90°, 120°, and 150° knee joint angles. Surface electromyography (EMG) of the four individual muscles in the quadriceps femoris (QF) was recorded and normalized by the EMG signals during isometric knee extension at MVC. Cross-talk on VI EMG signal was assessed based on the median frequency response to selective cooling of hamstring muscles. Normalized EMG of the VI was significantly higher than that of the other synergistic QF muscles at each knee joint angle (all P<0.05) with minimum cross-talk from the hamstrings to VI. There were significant correlations between the EMG signal of the hamstrings and VI (r=0.55-0.85, P<0.001). These results suggest that VI acts as a primary antagonistic muscle of QF during knee flexion, and that VI is presumably a main contributor to knee joint stabilization. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/23489717/The_highest_antagonistic_coactivation_of_the_vastus_intermedius_muscle_among_quadriceps_femoris_muscles_during_isometric_knee_flexion_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(13)00039-4 DB - PRIME DP - Unbound Medicine ER -