|（1.Key Laboratory of Adolescent Health Assessment and Exercise Intervention，Ministry of Education，College of Physical Education and Health，East China Normal University，Shanghai 200241，China；2.Shanghai Xinhua Private Junior High School，Shanghai 200080，China；3.Physical Education and Military Department，Zhejiang University of Technology，Hangzhou 310014，China）
Abstract: By using a model of female rat ovariectomy to simulate women’s postmenopausal state, the authors compared and studied the effects of such two different ways of exercising as jumping and swimming on the bones of ovariectomized rats, hoping to find a more effective mode of exercising for preventing osteoporosis. The authors di-vided 30 3 months old female SD rats randomly into 4 groups: a sham operated group, a calm group, a swimming group and a jumping group, in which the calm group, swimming group and jumping group were operated for ova-riectomy, while the sham operated group was just subjected to a sham operation (i.e. no ovariectomy). 8 weeks later, the weight, bone mineral density (BMD), bone biomechanics and bone metabolism related indexes of the rats in various groups were measured. The author revealed the following findings: as compared with the calm group, the BMD, maximum load, elastic load, destructive load, energy absorption and elastic stress of the femur of the rats in the jumping group increased significantly; the levels of blood serum Ca and tartrate-resistant acid phosphatase (STR-ACP) of the rats in the jumping group decreased significantly; as compared with the calm group, except that the blood serum Ca level of the rats in the swimming group decreased significantly (P<0.05), all the other indexes changed insignificantly although they shown a trend of changing. The said findings indicated the followings: the 8-week jumping exercise played a role in significantly improving the BMD, bone biomechanical and bone meta-bolic biochemical indexes of ovariectomized rats, while the results of improvement of the BMD, bone biomechani-cal and bone metabolic biochemical indexes of ovariectomized rats, produced by the 8-week swimming exercise were not as good as those produced by the jumping exercise; as compared with swimming, the jumping exercise played a more significant role in improving metabolism and promoting bone health, which suggests that it is more conducive to preventing osteoporosis from occurring to postmenopausal women.
Key words: sports biochemistry；way of exercising；osteoporosis；bone mineral density；biomechanics；animal experiment