Journal of Strength and Conditioning Research
2005 Volume 19 Number 4
Jun G. San Juan, James A. Yaggie, Susan Levy, Vert Mooney, Brian Udermann, and John M. Mayer

Study Outcomes & Clinical Relevance: Pelvic stabilization is necessary to achieve optimal recruitment of the lumbar extensor muscles during dynamic extension exercises on a lumbar extension machine. Therefore, if the goal is to strengthen the muscles of the low back, it is necessary to stabilize the pelvis with a clinically proven restraint system (found on MedX).