So, what about the low back and sitting? You guessed it – sitting is hard on the back! The pressure inside of our disks, those “shock absorbers” that lie between each vertebra in our spine (22 disks in total) is higher when we sit compared with simply standing or lying down. It’s estimated that when we lay down, the pressure on our disks is the lowest at 25mm. When lying on one side, it increases to 75mm, standing increases disk pressure to 100mm, and bending over from standing pushes disk pressure to 220mm. When we sit with good posture, our disk pressure may reach 140mm but that can increase to 190mm with poor posture. To help relieve the pressure on our disks, experts recommend: 1) Getting up periodically and standing; 2) Sitting back in your chair and avoiding slouched positions; 3) Placing a lumbar roll (about the size of your forearm) behind the low back and chair/car seat; and 4) Changing your position frequently when sitting.
Because certain low back conditions “favor” one position over another, these “rules” may need modification. For example, most herniated disk patients prefer low back extension while bending over or slouching hurts. In those with lumbar sprain/strains, bending forwards usually feels good and extension hurts. Modifying your position to the one that is most comfortable is perhaps the best advice.
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