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Transverse magnetic resonance images at the L₄–L₅ level of 26 males ranging in body mass index from 19.7 to 39.5 were digitized using a computer video monitor with mouse-mediated digitization software. The digitized musculature included the right and left psoas, rectus, abdominis, quadratus lumborum, oblique, and paraspinal muscle groups. From the digitized profiles, cross-sectional areas, and anteroposterior and mediolateral moments from the vertebral centroid were subsequently calculated. Multiple regression formulae were derived to predict the muscle parameters from the most strongly related anthropometrics. Cross-sectional area and moment arms for lean and obese groups were also compared. Significant regression formulae were derived for the cross-sectional area of the rectus abdominis and obliques, for mediolateral moment arms of the paraspinals, psoas, and obliques, and for anteroposterior …