I think the standing ovation in particular, is more likely to cause lower back pain than relieve it. My back pain is actually less, since I restarted bicycling (on a traditional hybrid bike), and the handlebars are in an upright enough position that I can see without over flexing my neck bones. I think those upright bikes in general will be murder on your lower back, especially when you hit bumpy stretches, and the bumps compress your vertebrae.

I'm just thinking though, without hard evidence beyond my personal experience. Thinking. A dangerous pastime, I know!