Abstract
Previous studies have shown that trunk muscle function is important for sports performance and that high trunk muscle function leads to high performance. However, the relationship between the performance level and the trunk momentum during sports performance remains unclear. Therefore, this study aimed to determine the relationship between the performance and trunk momentum. A total of 28 healthy men participated in this study. We measured the required time ten times while performing high knee tasks. In contrast, the trunk momentum was measured based on the average value (root mean square, RMS) of the angular velocity data obtained from the gyroscope installed in the lumbar region. The trunk momentum is LBωX-RMS and LBωY-RMS in the flexion extension and rotation directions, respectively. Statistical analysis was conducted using the Pearson product moment correlation coefficient. Significant positive correlations were detected between the required time in high knee tasks and trunk momentum (LB-RMS) (LBωX-RMS: r=-0.71, p<0.01, LBωY-RMS: r=-0.45, p=0.02). Since a negative correlation was found between the performance level and trunk momentum, we concluded that greater trunk movement is necessary for high performance.
