Vibration as a means to reduce bone loss in microgravity

> I guess I was thinking along the lines of durations of 2 years or more.
> Yes, I'd agree with you that for shorter durations, rotating for a full 1 G
> would probably not be necessary. For duty shifts of 1 year, let's say, it
> most certainly wouldn't be needed.

Have there been studies done on the long-term effects of low gravity on
humans? We know that 0G is A Bad Thing in the long term, but we just
haven't spent that much time on the Moon. I wonder if 1G is really an
ideal for the human body, especially since we were never designed to walk
upright in the first place...

--Justin