BACKGROUND
Physical activity and calcium nutriture with reproductive endocrine status are primary controller of bone remodelling activity. There are differences in impact of exercise on early menopausal bone ; late menopausal bone. There are possibility of different effect of calcium intake on bone mass among different life stage. The aim of this study was to elucidate whether the relation between lifestyle and bone mineral density varied with life stages.
METHODS
We examined bone mineral density and took questionnaires related to lifestyle of 1,698 women aged 49~54 years old who lived in ulsan from July 1999 to Dec. 1999. We selected 731 healthy subjects without medical conditions or lifestyle factors known to affect bone metabolism.
RESULTS
In 6~10 years postmenopausal women, those with calcium intake of more than 600 or 800mg /day showed significantly greater BMD. In postmenopausal women , those daily consumption of milk showed greater BMD. But it is not significantly. In premenopausal women with regular menstruation, those who took regular exercise showed significantly greater BMD than those who did not. Working hours is not related with BMD.
CONCLUSIONS
Our study showed that the relation between calcium intake or physical activity and BMD differed with life stages. It was suggested that life stages should be taken into consideration to perform lifestyle modifications for the prevention and management of osteoporosis.

Background
: Osteoporosis is chronic disease, therefore education about osteoporosis is very important in patients and high risk groups. The objective of this study is to assess the effect of audiovisual instruction about osteoporosis in perimenopausal women. Methods : We educated perimepopausal women who lived in Ulsan about lifestyle behavior related to osteoporosis from July.1999 to Dec.1999 and assessed improvements of lifestyle behaviors related to osteoporosis and evaluated factors that influence hormone replacement therapy uptake. Results : After the audiovisual instruction, hormone replacement therapy uptake, milk intake and exercise were significantly increased in only experimental group. But, smoking and coffee intake were not significantly decreased in both control group and experimental group. After the audiovisual instruction, the factor that significantly influenced hormone replacement therapy uptake was type of education and osteoporosis of participants and also it were significant after adjustment of multiple comparison. Menopause of participants influenced hormone replacement therapy but it was not significant after adjustment. Conclusion : Our study suggests that community intervention trial against osteoporosis improves lifestyle behaviors in perimenopausal women. Longer term studies are needed to determine the relationship between improvements in lifestyle behaviors and osteoporosis.