The effect of stance width on electromyographic response of vastus medialis oblique and vastus lateralis muscle during isometric squat exercise

Abstract

The purpose of this study is to compare and analyze the degree of muscle activity according to the width of the stance. This study will select 8 male students in their twenties who have a weight training course and who have had no physical disease in more than 3 years. The squat movement behavior will be measured at the subject's 80% 0RM weight and will measure the MVIC with isometric contraction for 5 seconds on the conditional stance. First, the muscle activity of the rectus femoris, vastus medialis, and vastus intermedius tended to be higher in the order of narrow stance-standard stance-wide stance. Second, muscle activity of biceps femoris, gastrocnemius, and soleus tend to increase in the order of wide stance-standard stance-narrow stance. The wider the stance, the greater the stability, the less the legs are used, the more the hips are used.