THE INFLUENCE OF JUMPING PERFORMANCE AFTER RECTUS ABDOMINIS FATIGUE

The purpose of this study was to evaluate the changes on lower extremity during counter-movement jump after rectus abdominis fatigue. 12 male volleyball players were recruited. The kinematics and EMG data were collect during jumping in CMJ before and after rectus abdominis fatigue. Paired sample t-test was used to assess the statistics difference. The significant level was set to α=.05. The result showed that after rectus abdominis fatigued, the COM was higher while squat, and the jumping height was lower. The players could not fully squat after rectus abdominis fatigued. It caused the jumping height lower. Based on the results from this study, coaches could strengthen the core muscles training for volleyball players to increase stability of jumping performance.