4Kelley, GA. Aerobic exercise and bone density at the hip in postmenopausal women: a meta - analysis [J]. Prev Med, 1998, (27) :798 - 807.
5Kelley, GA. Aerobic exercise and lumbar spine bone mineral density in postmenopausal women: a meta - analysis[J]. J Am Geriatr Soc, 1998, (46) : 143 - 152.