Fig. 4.

The Double-leg lift-lower test. (Illustrations adapted from Monnier et al.: Inter- and intra-observer reliability of clinical movement-control tests for marines. BMC Musculoskeletal Disorders 2012 13:263). Purpose: To test the ability of preventing extension and flexion of the lumbar spine. Test movement: A pressure biofeedback unit (Chattanooga Group, Hixon, TN) was initially positioned between the lumbar lordosis and bench surface and inflated to a pressure of 40 mmHg, raising both legs from a supine (crook lying) position to 90° hip flexion and lowering the legs back to the starting position. Pass Criteria: <5 mmHg pressure change