Abstract
When lifting the heel, it seems that the angle of spinal extension and the range of shoulder anterior elevation are improved in cases of kyphosis and posterior deflection of center of gravity in the standing position. In this research, with 24 healthy adults as subjects, the effect variation of the angle of ankle joint under 3 conditions of 0°, 10° plantar and dorsal flexion contribute to angle of spinal curve, angle of the pelvis inclination, and the shoulder anterior elevation in the sagittal plane were investigated. In addition, we examined the effect in different classes of standing posture. Focusing on the position relationship of upper center of gravity and lower center of gravity, standing posture was classified into 3 types: the anterior type, posterior type, and neutral type. As a result, in all posture types, the range of shoulder anterior elevation was not changed among 3 conditions, however, the angle of pelvis inclination and center of pressure were changed in the posterior type. Because of varied angle of pelvis inclination, motion of the pelvic and the lumbar vertebra were influenced by shoulder anterior elevation.
