5Devlin L.Recurrent posterior thigh symptoms detrimental to performance in rugby union: Predisposing factors[J].Sports Med, 2000,29:273-287.
6Sommer H M.Patellar chondropathy and apicitis, and muscle imbalances of the lower extremities in competitive sports [J]. Sports Med, 1988;5: 386-394.
7Zeller B L, McCrory J L, KiblerW B,et al.Differences in kinematics and electromyographic activity between men and women during the singlelegged squat[J]. A m J Sports Med, 2003,31:449-456.
8Ian Hasegawa. The Use of Unstable Training for Enhancing Sport Performance[J]. NACA' s Performance Training Journal, 2005, 4(4) :15 - 17.
9Travis Brown. Core Flexibility Static and Dynamic Stretches for the Core [J]. NACA' s Performance Training Journal, 2005, 4(4) :8 - 10.
10Paul J. Goodman. Connecting the Core[J]. NACA' s Performance Training Journal, 2004, 3(6) :10 - 14.