Abstract
The purpose of this study was to investigate the relationship between lower trunk muscular contraction and variety of joint movement on 10 healthy males (20.9 ± 1.6 ages). As a result, with abdominal cave-in compared to abdominal bracing, we found active range of motion and isometric muscular strength in shoulder flexion, shoulder external rotation, hip flexion, hip extension, trunk rotation and trunk extension were increased. Also, the activation of transversus abdominis / obliquus internus on external rotation of shoulder, and the activation of gluteus maximus on trunk extension were increased significantly. The lumbar lordorsis angle and the abdomen length were decreased significantly with abdominal cave-in compared to abdominal bracing.
