Trunk Muscle Activities and Anterior Pelvic Tilt of Healthy Young Adults Performing the Double-leg Straight-leg Lowering Test

Abstract

[Purpose] To clarify the details of trunk flexor muscle activities and anterior pelvic tilt while keeping the legs raised in the supine position. [Subjects and Methods] Twenty-three healthy adult male subjects raised their legs while keeping both knee joints straight until the hip joint was flexed to 90°, and they then lowered their legs in 15° intervals, maintaining their legs at each angle. Trunk flexor muscle activities were measured by electromyography, and the angle of pelvic tilt was also measured. [Results] Changes in the muscle activity and forward inclination of the pelvis were found at an early stage. [Conclusion] The results suggest there is a need to examine the criteria of the double-leg lowering test.