Sagittal Plane Moment Arms of the Male Lumbar Region Rectus Abdominis: Upright Vs. Supine Posture

Prior studies of torso muscle moment arms for inputs into torso biomechanical models have been derived from subjects lying supine. Recent research suggests that moment arms of the rectus abdominis increase when standing versus lying supine. The objective of this study was to quantify and compare the sagittal plane rectus abdominis moment arm from upright and supine postures. Cross-sectional MRI images from ten males in both upright and supine...