Abstract
The purpose of this study was to investigate the effect of trunk replacement on Nordic hamstrings (NH). Seven healthy male students were selected. Three muscles, the left biceps femoris, the gluteus maximus, and the erector spinae, were measured. The normal limb position, the position of the acromion, and the lateral epicondyle of the femur were not changed, and two types of limb positions, which were slightly flexed in the hip joint, were measured by isometric contraction using a surface electromyograph. The biceps femoris and the erect spine muscle activities in the trunk compensation position was significantly lower than that in the normal posture, and the hip flexion angle and the knee flexion angle were significantly increased. NH's trunk compensatory movement was found to affect biceps femoris and erector spinae muscle activity.
