6Orwoll ES, Ferar J, Oviatt SK, et al. The relationship of swimming exercise to bone mass in men and women[J]. Arch Intern Med,1989;149 (10) :2197-200.
7Downey PA, Siegel MI. Bone biology and the clinical implications for osteopoiosis [J].hy Ther,2006 ;86 ( 1 ) :77-92.
8Elaine MM. Designing exercise programs to lower fracture risk in mature women[J]. Strength Conditioning J ,2006 ; 1:24-30.
9Goldber GA. Postmenopausal obesity risks reduced when aerobic exercise is added to weight loss [J]. Women' s Health Weakly, 2002 ; 19 (2) :20.
10Selby VC. Processes of change in the acquisition and maintenance of exercise[M]. Manu Submitted Pub, 1989:20-5.