3Panjabi MM, Abumi K, Duranceau J, et al. Spinal stability and intersegmental muscle forces. A biomechanical model. Spine,1989,14(2): 194-200.
4Panjabi MM. The stabilizing system of the spine. Part i. Function, dysfunction, adaptation, and enhancement. J Spinal Disord, 1992a,5(4) : 383-9 discussion 397.
5Panjabi MM. The stabilizing system of the spine. Part ii. Neutral zone and instability hypothesis. J Spinal Disord, 1992b, 5(4) : 390-6 discussion 397.
6Lehman GJ,Hoda W,Oliver S. Trunk muscle activity during bridging exercises on and off a Swiss ball.Chiropr Osteopat, 2005, ( 30 ) : 13-14.
7Drake JD,Fischer SL,Brown SH,et al. Do exercise balls provide a training dvantage for trunk extensor exercises a biomeehanical evaluation? J Manipulative Physiol Ther, 2006,29(5) : 354-62.
8Callaghan JP,Gunning JL,McGill SM. The relationship between lumbar spine load and muscle activity during extensor exercises. Physical Therapy, 1998,78( 1 ) : 8-18.
9Vera-Garcia FJ,Grenier SG,McGill SM. Abdominal muscle response during curl-ups on both stable and labile surfaces. Physical Therapy, 2000, 80(60) : 564-569.