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Background: Exercise therapy is one of the most effective methods for dealing with low back pain. The present study aimed to compare to examine the effects of two protocols, i.e., six weeks of lumbar stability exercises (LSE) and global postural reeducation exercises (GPR), followed by a subsequent period of non-training on hip muscle flexibility in men with chronic non-specific low back pain (NSLBP) with lumbar movement control impairment (MCI). Methods: In this randomized clinical trial, 46 men suffering from NSLBP with lumbar MCI were selected and randomly divided into three groups (i.e., two exercise groups - one control group). Training intervention groups were allowed to perform exercises for 6 weeks, three sessions per week. Universal goniometer was used to measure the flexibility of hip muscles (i.e., hamstring, rectus femoris, external rotator, and tensor fasciae latae). Repeated measures ANOVA was utilized to compare the effect and durability of the two training protocols on the dependent variables at a significant level. Results: The results showed that both training methods increased hamstring muscle flexibility (P=0.001). GPR method was found superior in increasing the flexibility of the right hip of the subjects in the post-test (P=0.032) and follow-up (P=0.024). However, no significant differences were observed in the other hip muscles flexibility. Conclusion: It was concluded that the GPR method, compared to the lumbar stabilization method, had a greater potential to increase the flexibility of shortened muscles by enhancing the contraction of the antagonist muscles to avoid postural asymmetry. It seems both training protocols were effective in improving hamstring muscle flexibility in people with NSLBP suffering from MCI and this result was observed after both training and 4 weeks of inactivity.

Keywords: Low back pain, Abnormal movement, Global postural reeducation, Lumbar stabilization, Flexibility

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