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Examples of muscle groups measured in computed tomography scans at the L2 level of the spine in a participant with low muscle density (top) and high muscle density (bottom). Muscle grouping examined included: 1) paraspinal muscles (erector spinae and transversospinalis), 2) posterior abdominal muscles (psoas major and quadratus lumborum), and 3) anterior abdominal muscles (rectus abdominis, external oblique, and internal oblique).
