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Alternate muscle activity patterns among synergists of the quadriceps femoris including the vastus intermedius during low‐level sustained contraction in men
Author(s) -
Akima Hiroshi,
Saito Akira,
Watanabe Kohei,
Kouzaki Motoki
Publication year - 2012
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.23268
Subject(s) - vastus medialis , isometric exercise , contraction (grammar) , electromyography , quadriceps femoris muscle , medicine , muscle contraction , vastus lateralis muscle , anatomy , physical medicine and rehabilitation , cardiology , skeletal muscle
We quantified the alternate muscle activity among four synergists of the quadriceps femoris (QF), including the vastus intermedius (VI), during low‐level sustained contraction. Methods: Surface electromyograms (EMGs) were recorded from the VI, vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) in 11 healthy men during isometric knee extension at 2.5% maximum voluntary contraction for 60 min to determine alternate muscle activity among the four synergists of the QF. Results: Alternate activity was primarily found between the RF and VI, VL, or VM, and rarely found among the vasti muscles. Multiple muscle comparison revealed the duration of alternate activity in the RF/VI+VL+VM combination remained high throughout the experiment, although the frequency of that combination did not. Conclusions: These results suggested that there is a fixed muscle combination, i.e., RF and the 3 vasti muscles, to perform low‐intensity sustained contraction in the human QF. Muscle Nerve 46: 86–95, 2012