I caught a bit of this on NPR this morning, well more specifically the comments on how they are using MRIs to spot differences in pain levels caused by sitting, but this little article by ScienceDaily covers it a little more in depth. I’ve suffered back pain for a while, and I’ve found it mostly occurs at home. Probably doesn’t help I’m constantly picking up my son, and those with kids know how they are never in “the right spot” to be picked up, or wiggle, squirm, kick, and fight. My chair at work is great, I think an Aeron, which when I sit on puts me in a comfortable position. I generally have the seat reclined slightly and the back tips back too, so a rough estimate on the 135 degrees that has been found to be the ideal spot seems pretty close for me.