Analysis of Spinal and Muscular Activity during Flexion/Extension and Free Lifts
Gracovetsky S, Kary M, Levy S, Ben Sa�d R, Pitchen I, H�lie J.
Spine
15(12) : 1333-1339, 1990.
Abstract
Detailed measurements of the relative contributions of spine motion and pelvic motion
during flexion-extension and free lifts (squat-type) are examined. The results are
consistent with the conclusion that passive stretching of the ligamentous tissues
transmits significant extensor moment in these activities, the power being supplied by the
hip extensor complex acting on the pelvis. In addition, certain injuries result in
measurable changes in the kinematic parameters that determine the ligamentous involvement,
and these changes can be used to help evaluate spinal condition.
