Moon City + bone health ?

"Ken S. Tucker" wrote in message
...
This post is adjunct to the "Moon City?" post, but specialized.

There seems to a problem with human frame degradation in 0 and low g,
(1/6 g) enviroments.

There is absolutely zero data on long term exposure to a 1/6 G environment.
The time which man has spent in a 1/6 G environment is best measured in
hours (i.e. the Apollo lunar landings).

Remainder of original posting deleted due to unsupported premise.

Jeff
--
"Many things that were acceptable in 1958 are no longer acceptable today.
My own standards have changed too." -- Freeman Dyson


..

Actually it's not a complete mystery. Bones react to stress. They're
constantly being built and destroyed. Osteoblasts create bone and I'm
blanking on the cells that basically remove the bone matrix. On orbit
or during bed rest, the stress is removed and evidently the osteoblasts
cut back, but the demineralization continues.

The destroying cells are called osteoclasts.

It appears that there is a constant rate of activity of the osteoclasts,
while the osteoblasts's rate of activity depends on local levels of
material stress. The balance clearly determines the overall fate of your
bone structure.

Jan