Abstract
The purpose of this study is to clarify the mechanism of competitive swimmers' lumbar injury from the viewpoint of biomechanics, focusing on the lumbar load and behavior. First, whole body simulation for the six beat crawl is carried out, and the joint force and torque at lumbar are calculated. Next, by the use of the two-dimensional musculo-skeletal model for lumbar on sagittal plane, the movement of the lumbar spine and the muscle force are calculated. It is found that the intervertebral joints of L5/S1 and L4/L5 move with larger amplitudes than the other joints.
