1.   No trials have assessed the effectiveness of bone mass screening in preventing osteoporotic fracture.

2.   For example, elderly women are prone to a loss of bone mass.

3.   Athletes can have more bone mass, which increases impedance.

4.   A loss of bone mass is typical, muscles atrophy from lack of use, and the inner ear system is impaired.

5.   A recent consensus conference on osteoporosis at the National Institutes of Health has elevated the importance of building peak bone mass to the level of preventing bone loss.

6.   Calcium absorption -- crucial to building and maintaining bone mass -- is linked to estrogen, and slows after menopause when the levels of naturally occurring estrogen drop.

7.   Calcium absorption -- crucial to building and maintaining bone mass -- is linked to estrogen, and slows after menopause when the levels of the naturally occurring estrogen drop.

8.   During months of hibernation bears lose no bone mass, while injured or bedridden humans can lose a lot.

9.   Especially helpful are weight-bearing activities, which increase bone mass.

10.   Estrogen replacement also helps maintain bone mass and lowers fracture risk in women with osteoporosis.