So, as a lot of us probably know, sitting for excessive periods of time is noted as being a major cause for developing tight hip flexors and forcing our lumbar curve into a hyper-lordotic state (anteriorly tilted pelvis.)
To me, however, that is something which I find confusing; I had always thought that the typical 'computer guy' would be more prone to developing a posterior pelvic tilt, as a slouched sitting position appears to force the spine into a complete state of flexion (if flexion of the lumbar spine is coupled with kyphosis of the upper back.)
Is it the case that, with poor attention to posture, the psoas shortens under spinal flexion while seated, but remains shortened when we stand up, reversing the direction in which the pelvis is pulled (from posteriorly tilted to anteriorly tilted)? If so, then what would cause the spine to remain in a state of flexion? Been doing some reading over articles regarding posture recently, and just wanted to clear this up to get a better understanding.