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[Purpose] The purpose of this study was to investigate the preferential activity of the vastus medialis oblique (VMO) of six isometric knee extension exercises. [Subjects] Eighteen healthy females participated in this study. [Methods] The subjects performed six isometric knee extension exercises: straight leg raise (SLR), straight leg raise with externally rotated hip, knee flexed at 60 degrees combined with neutral, internal, and external tibial rotation, and simultaneous isometric hip adduction at 10 degrees of hip adduction with the knee fully extended. The muscle activities of VMO and VL and VMO/VL ratios were calculated during the exercises. [Results] The VMO/VL ratios of the exercises with tibial rotations were significantly greater than the exercises involving SLR. VMO muscle activities of the exercises with tibial rotations were significantly higher than these of the other exercises. [Conclusion] The results suggest that isometric knee extension exercises with the knee flexed are effective at preferentially activating VMO. It will be necessary to examine the effect on preferential activity of VMO in knee extension exercises with the knee flexed.

Comparison of Muscle Activities of the Vastus Medialis Obliquus during Maximum Isometric Contraction in Knee Extension Exercises