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Excerpt
The purpose of this study was to compare resistance training with pelvic stabilization, without pelvic stabilization, and with a 45 ° Roman chair on the development of isolated lumbar extension strength. Peak isometric (IM) lumbar extension torque was measured on 12 females and 21 males with a MedX(Ocala, FL) dynamometer with (PR) and without (NR) pelvic restraint at 7 angles of lumbar flexion, before and after 12 weeks of progressive resistance training. Subjects were assigned to 1 of 4 groups: Two groups trained on the same lumbar extension machine (MedX), one with pelvic stabilization (PSTAB, n=9) and one without pelvic stabilization (NOSTAB, n=9); a third group trained on a 45 ° Roman chair (RCHAIR, n=9); a fourth group did not train(CONTROL, n=6). Exercise consisted of 1 set of 8-12 repetitions to volitional exhaustion, one time per week. All training groups showed an increase in dynamic training load (PSTAB = 30.1 kg; NOSTAB = 49.1 kg; RCHAIR = 15.3 kg, p≤ 0.05). Peak IM torque in the PR test increased for PSTAB (15.8% p ≤ 0.05) and NOSTAB (20.6%, p ≤ 0.05), but not for RCHAIR (p > 0.05) relative to CONTROL. Peak IM torque in the NR test increased for NOSTAB(32.5%, p ≤ 0.05) but not for PSTAB (p > 0.05) or for RCHAIR (p > 0.05) relative to CONTROL. These data indicate that pelvic stabilization is not required to increase isolated lumbar extension strength when testing and training are conducted on the same dynamometer. Training without pelvic stabilization probably strengthens the gluteal and hamstring muscles, as well as the lumbar extensors. Lack of improvement for the RCHAIR group suggests a specificity of training bias related to the evaluation of isolated lumbar extension torque output.
