Background
Recently, a review of reviews concluded that exercise therapy of any type makes no difference to the effect on pain or disability in adult patients with acute low back pain (LBP). Whether this is also the case for exercise therapy in chronic LBP is still unknown.
Objectives
To summarize and synthesize systematic reviews (SR) and meta-analyses (MA) investigating the effects on pain and disability of common exercise types used in chronic LBP.
Methods
We included systematic reviews from several databases in which ≥ 75% of the studies were RCTs on adults between 18 and 70 years of age suffering from chronic or recurrent LBP for a period of at least 12 weeks. These were grouped into nine exercise types: Aerobic training, Aquatic exercises, Motor control exercises (MCE), Resistance training, Pilates, Sling exercises, Traditional Chinese Exercises (TCE), Walking, and Yoga. The study quality was assessed with AMSTAR-2. For each type of exercise, a narrative analysis was performed, and the levels of evidence for the effects of exercise were assessed through GRADE.
Results
The wide search resulted in 2,345 studies, and out of the 246 full texts that were screened, 41 SR/MA were included. Of these, 10 SR/MA were of high quality, 15 of moderate, 14 of low, and two of critically low quality. We found low to moderate evidence of mainly short-term and small beneficial effects on pain and disability for MCE, Resistance training, Pilates, TCE, and Yoga compared to no intervention. Few reviews were found for Aerobic, Aquatic, Sling, and Walking exercises, but with promising results. Aquatic exercises seem to be more beneficial compared to land exercises (low level of evidence).
Conclusions
In line with previous studies but in a broader perspective, this systematic review of reviews showed that there is low to moderate evidence that exercises are effective for reducing pain and disability compared to no or minimal interventions, but that no exercise type is more effective than other conservative interventions (very low to moderate evidence).
Systematic review registration number
PROSPERO: https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=190409