The double leg lowering test is a fundamental movement screen used in clinical and fitness settings to assess core stability and pelvic control. This simple yet revealing exercise requires the subject to lie supine, press the low back into the floor, and slowly lower both legs toward the ground while maintaining neutral spinal alignment. The test isolates the deep core stabilizers, particularly the transversus abdominis and pelvic floor, by removing the leverage advantage provided by the legs. Observing the motion and end position of the pelvis provides valuable insight into an individual’s ability to manage load without compromising spinal integrity.
Understanding the Biomechanics of the Test
To properly interpret the double leg lowering test, one must understand the kinetic chain involved. The lumbar spine must remain statically positioned against the mat, resisting the gravitational pull exerted by the legs. As the legs descend, the hip flexors—primarily the iliopsoas—act as the primary movers, but they create an anterior pelvic tilt moment. The core musculature counters this force by generating intra-abdominal pressure and contracting the posterior abdominal wall. If the core endurance is insufficient or the lumbopelvic control is poor, the lower back will arch off the floor, indicating a failure to stabilize the lumbopelvic region.
Performance Protocol and Positioning
Executing the test correctly ensures accurate results and minimizes the risk of strain. The subject begins in a supine position with arms relaxed at the sides and knees bent to 90 degrees, feet flat on the floor. The therapist or trainer palpates the lumbar spine to confirm a neutral curve and instructs the subject to engage the core as if preparing for a punch. With the hands positioned under the lower back for feedback, the subject inhales, exhales fully, and slowly extends one leg to hover above the floor, followed by the other. The legs are then lowered simultaneously toward the floor in a controlled manner without allowing the pelvis to rock or the spine to lose contact.
Key Points of Performance
Maintain constant contact between the lumbar spine and the examination table.
Avoid using momentum or jerky movements during leg descent.
Keep the feet flexed to prevent accidental leg swing due to momentum.
Inhale during preparation and exhale during the lowering phase.
Stop the test immediately if pain is experienced in the lumbar region.
Scoring the Results
Interpreting the test involves observing specific criteria related to pelvic position and spinal motion. A normal result allows the legs to descend to approximately 30 to 45 degrees from the vertical without any loss of lumbar contact. The pelvis remains level, and the ASIS (anterior superior iliac spine) maintains a horizontal orientation. A positive or abnormal finding is indicated by the low back lifting off the floor, a posterior pelvic tilt, or one side of the pelvis dropping lower than the other. These deviations suggest poor core control, tight hip flexors, or weak abdominal musculature.
