3Merritt LG, Merritt CM. The gym ball as a chair for the back pain patient: A two case report [J]. J Can Chiropr Assoc, 2007,51 (1):50-55.
4Petrofsky JS, Batt J, Davis N, et al. Core muscle activity during exercise on a mini stability ball compared with abdominal crunches on the floor and on a Swiss ball[J].The Journal of Applied Research, 2007,7(3):255-72.
5Marshall PW, Murphy BA. Core stahility exercises on and off a Swiss ball[J]. Arch Phys Med Rehabil, 2005,86(2):242-249.
6Liebenson C. Rehabilitation of the Spine: A Practitioner's Manual (2nd Edition)[J]. J Alt Compl Med,2006,12(9):937-8.
7Beruskens AJ, de Vet HC, Koke AJ, et al. Measuring the funclional status of patients with low back pain. Assessment of the quality of four disease-specific questionnaires [J]. Spine, 1995,20(9):1017-1028.
8Bendix AF, Bendix T, Ostenfeld S, et al. Active treatment programs for patients with chronic low back pain: a prospective, randomized, observer-blinded study[J]. Eur Spine J, 1995,4:148-52.
9Petrofsky JS, Cuneo M, Dial R, et al.Core muscle strengthening on a portable abdominal machine [J]. J Appl Res,2005,5(3): 460-472.
10Roy SH, De Luca CJ, electromyographic assessment of Emley M, et al. Spectral back muscles in patients with low back pain undergoing rehabilitation[J]. Spine,1995,20:38-48.