4Devlin L.Recurrent posterior thigh symptoms detrimental to performance in rugby union: Predisposing factors[J].Sports Med, 2000,29:273-287.
5Sommer H M.Patellar chondropathy and apicitis, and muscle imbalances of the lower extremities in competitive sports [J]. Sports Med, 1988;5: 386-394.
6Zeller 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.
