LAUSR

BACKGROUND Exercise is considered an effective intervention to relieve chronic back pain. However, it is still unknown whether specific exercise patterns vary in terms of their efficiency and effectiveness. AIM To investigate the differential health and economic effects of intensity, specificity and degree of subjective perceived physical exertion across five exercise patterns (endurance, gymnastics, fitness, back gymnastics, multimodal back exercise) in adults with back pain. DESIGN Longitudinal observational cohort study over a period of 24 months. SETTING Various non-therapeutic exercise facilities (e.g., outdoor, fitness centres, health insurance programmes, sports clubs) across one federal state of Germany (Baden- Wuerttemberg). POPULATION Adults with back pain (N = 2,542, Mean = 46.9 years, 66% females, Graded Chronic Back pain GCPS 1= 40.5%, GCPS 2= 27.3 %, GCPS 3= 20.7 %, GCPS 4= 11.5 %). METHODS Self-reported back pain (functional restrictions and pain = Back Pain Function Score, BPFS) and characteristics of exercising behaviour (frequency, duration, type, physical exertion) were assessed at baseline and at 6, 12, 18 and 24 months. Direct medical costs for back disorders (International Classification of Diseases, Dorsopathies: M40 - M54) were compiled from health insurance records. RESULTS Moderate- to high-intensity exercise patterns were effective in reducing back pain, particularly at lower levels of subjective perceived physical exertion. At these intensity levels, multimodal back exercise (i.e., exercising the spine-stabilizing muscles specifically, ergonomic training) was 14.5 times more effective than non-backspecific fitness exercise in reducing back pain (BPFS). The beneficial effects of both exercise types increased with the initial severity of back pain. However, only multimodal back exercise (moderate- to high-intensity/high back specificity) was associated with a significant decrease in direct medical costs for back pain. CONCLUSIONS Targeted exercise of the spine-stabilizing musculature at moderate to high intensities without maximum perceived exertion is effective and efficient in reducing back pain.