Sway-back posture shows an increase in posterior tilt of the pelvis and the trunk and thoracic kyphosis in comparison to neutral posture. See image second from left as distinct from the 2 images on right showing hyperlordosis lumber spine. This postural change is associated with increased activity of the rectus abdominis muscle and decreased activity of the abdominalinternal oblique muscle and decreased activity of the iliopsoas and gluteus maximus muscles in the hip joint. Sway-back posture reduces contraction of the skeletal muscles, thereby applying stress to the skeletal system, which is a factor not related to contraction, and leads to an increase in stress applied to the lumbar area.[1]
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