The Effect of Knee Exercises on the Onset Time of Vastus Medialis Oblique and Vastus Lateralis Muscle

무릎운동훈련들이 안쪽빗넓은근과 가쪽넓은근의 수축 개시시간에 미치는 효과

  • Kim, Myoung-Jin (Dept. of Physical Therapy, Yeoungdong College) ;
  • Kim, Ji-Won (Dept. of Anatomy, Wonju College of Medicine, Yonsei University) ;
  • Lee, Jae-On (Dept. of Physical Therapy, Saeroun Hospital) ;
  • Park, Kyoung-Hee (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Shin, Hwa-Kyoung (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University)
  • 김명진 (영동전문대학 물리치료과) ;
  • 김지원 (연세대학교 원주의과대학 해부학교실) ;
  • 이재온 (새로운 병원 물리치료실) ;
  • 박경희 (연세대학교 대학원 재활학과) ;
  • 신화경 (연세대학교 대학원 재활학과)
  • Published : 2001.05.21


The purpose of this study was to investigate the effect of knee exercises on the onset times of vastus medialis oblique muscle (VMO) and vastus lateralis muscle (VL) and in healthy subjects. Fifteen subjects (7 men, 8 women) in a mean age of 26.4 years participated in the study. Electromyographic (EMG) signals were recorded from the VMO and VL under four exercises. Knee exercises consisted of open kinematic terminal knee extension, straight leg raising, isometric hip adduction exercise, and closed kinematic terminal knee extension. No significant differences were found in the onset times of EMG activities of VMO and VL in the four exercises. There were also no significant differences among the exercises. These results coincided with previous studies that found no difference between onset of VMO and VL. However, it is difficult to say that there is no difference between onset of VMO and VL in healthy subjects. To confirm this results, further researches that follow same on set determination metod and exercises are needed. Not only is the study of onset time of muscle needed, but also the studies of the amount of activation and the rate of increase of muscle activation are needed.