It just varies from person to person, depending on the injury. Straight back for sure for me, whatever the position the legs are in. Any car, somebody else drives it, they have to lay that seat back. I have to be straight up, so I can use the core muscles to support my back. Laid back, my back will go into that twist that hurts. So for me, its definitely all the way straight up, or all the way laid down in bed. I don't own any slouchy chairs anymore.
Riding my scooter, my feet are very forward, but I keep that rear shock set very soft so I don't need to keep my weight on my feet, as you would riding a dirt bike or crotch rocket.
One thing that surprised me very much, was how much it worked my core muscles to ride the gas scooter in corners. A good ride on a curvy mt road does wonders for my core strength. But only if you ride it fun, pulling max g's and leaning it all the way. I'll go to an empty parking lot sometimes and ride a ton of corners at 15 -20 mph, just to work my core.
RE the dr ho's thing. I would not wear one all the time, but wearing one might extend the back enough to keep your nerves from grinding till you get stronger. But you still gotta get that core strong, so you are always able to hyperextend. Wearing back supports too much can let your core get even weaker. So wear it when you must, but try not to live in it. Keep going ten hut, and get those muscles over your kidneys strong.
FWIW, once I got really hurt, that was the end of 8-12 hour work days. I HAD to semi retire, and work till it hurt too much, then STOP. That was 30 years ago, and I will NOT need my back fused. It cost me tons of money to work less, but not my life.
