9Fuchs R K,Bauer J J, Snow C M. Jumping improves hip and lumbar spine bonemass in prepubescent children:a randomized controlled trail [J]. J Bone Mine Res,2001,16( 1 ):148-155.
10Nickols-richardson S M,Modlesky C M,O' Connor P J,et al. Premenarcheal gymnasts posses higher bone mineral density than control [J].Med Sci Sports Exerc, 2000,32(1): 63-69.