4[2]United Nations, Department of Economic and Social Affairs,World Population ageing 1950 ~ 2050, United Nations,Department of Economic and Social Affairs, New York,2004.
5[3]United Nations, Department of Economic and Social Affairs, World Population Prospects, United nations,Department of Economic and Social Affairs, New York,2002.
9Sherv V D, Palmer I J, Bemben M G, et al. Relationships between body composition, muscular strength, and boneminer- al density in estrogen -deficient postmenopausal women [J]. Clin Densitiom, 2009,12 (3) :292 ~ 298.
10Danz AM, Zittermann A, Schiedemaier U, et al. The effects of a specific strength development exercise on bone density in postmennopausal woman [J]. Woman H - ealth, 1987,7 (6) : 701 ~ 702.