European Journal of Applied Physiology

, Volume 106, Issue 5, pp 665–673 | Cite as

Normalized EMG to normalized torque relationship of vastus intermedius muscle during isometric knee extension

  • Kohei Watanabe
  • Hiroshi Akima
Original Article


The purpose of the present study was to investigate the electromyography (EMG) to torque relationship of the vastus intermedius (VI) muscle. Thirteen healthy men performed maximal voluntary contraction (MVC) and submaximal contraction during isometric knee extension at 10% of the MVC to 90% of the MVC at intervals of 10% of the MVC level. Surface EMG was detected from four muscle components of the QF muscle group, i.e., VI, vastus lateralis (VL), vastus medialis, and rectus femoris (RF) muscles. Normalized muscle activation in the VI muscle was significantly lower than in the VL muscle at a lower torque level (20 and 40% of MVC) and significantly lower compared to the RF muscle at a higher torque level (from 60 to 90% of MVC). These results suggest that neuromuscular activation in the VI muscle is not consistent with the other components of QF muscle group during submaximal knee extension contractions.


Isometric contraction Quadriceps femoris Surface electromyography Synergistic muscles 


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Graduate School of Education and Human DevelopmentNagoya UniversityNagoyaJapan
  2. 2.Research Center of Health, Physical Fitness and SportsNagoya UniversityNagoyaJapan

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