Pelvic and femoral contributions to bilateral hip flexion by subjects suspended from a bar.

Objective: To quantify the contribution of the pelvis and femur to active bilateral hip flexion conducted while subjects are suspended by their hands from a bar.

Design: Descriptive and experimental.

Background: Voluntary hip flexion while in a suspended position is used in abdominal strengthening regimens and is required for certain athletic activities.

Kinematics of the double-leg-lowering test for abdominal muscle strength.

Study Design: Prospective descriptive study.

Objective: To investigate the kinematics of the double-leg-lowering (DLL) test of abdominal muscle strength.

Background: Adequate strength of the abdominal muscles is necessary for many household, occupational, and sports activities.