Differences in onset timing between the vastus medialis and lateralis during
concentric knee contraction in individuals with genu varum or valgum |
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Authors: | Seol Park Yong-Soo Kong Yu-Min Ko Gwon-Uk Jang Ji-Won Park |
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Institution: | 1) Department of Physical Therapy, College of Medical Science, Catholic University of Daegu, Republic of Korea |
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Abstract: | Purpose] The purpose of this study was to investigate the difference in onset timing
between the vastus medialis and lateralis among the different knee alignments, as well as
the best isokinetic angular velocity for an isokinetic concentric contraction. Subjects]
Fifty-two adults (20 with genu varum, 12 genu valgum, and 20 controls) were enrolled in
this study. Subjects with > 4 cm between the medial epicondyles of the knee were placed
in the genu varum group, whereas subjects with > 4 cm between the medial malleolus of
the ankle were placed in the genu valgum group. Methods] Surface electromyography was
used to measure the onset times of the vastus medialis and vastus lateralis during
concentric contractions at 30, 60, and 90°/sec. Results] The vastus lateralis showed more
delayed firing than the vastus medialis in the genu varum group, whereas vastus medialis
firing was delayed more than that of the vastus lateralis in the genu valgum group. No
differences in onset timing were observed between the vastus medialis and lateralis
according the different angular velocities during concentric contractions in all three
groups. Conclusion] Genu varum and valgum affect quadriceps firing. Therefore, selective
rehabilitation training of the quadriceps femoris should be considered to prevent pain or
knee malalignment deformities.Key words: Quadriceps muscle, Genu varum, Genu valgum |
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