Effects of community‐deliverable exercise on pain and physical function in adults with arthritis and other rheumatic diseases: A meta‐analysis

OBJECTIVE: To use the meta-analytic approach to determine the effects of community-deliverable exercise on pain and physical function in adults with arthritis and other rheumatic diseases (AORD). METHODS: Data sources consisted of 6 electronic databases, cross-referencing from retrieved studies and expert review. Study selection included 1) randomized controlled trials; 2) ≥ 1 exercise intervention group; 3) community-deliverable exercise interventions ≥ 4 weeks in duration; 4) control group; 5) adults ages ≥ 18 years with rheumatoid arthritis, osteoarthritis, fibromyalgia, lupus, gout, or ankylosing spondylitis; 6) published and unpublished studies; 7) studies published in any language between January 1, 1980, and January 1, 2008; and 8) data available for pain and/or physical function. Data abstraction included dual coding by 2 of the authors. Standardized effect sizes (g) and random-effects models were used to pool pain and physical function outcomes. Data were analyzed according to per-protocol and intent-to-treat (ITT) results. The minimally clinically important difference (MCID) and number needed to treat (NNT) were also calculated. RESULTS: Thirty-three studies representing 3,180 men and women (1,857 exercise, 1,323 control) with rheumatoid arthritis, osteoarthritis, and fibromyalgia were included. Statistically significant and clinically important improvements were observed for pain (per-protocol g = -0.37 95% confidence interval (95% CI) -0.53, -0.21, MCID -18%; ITT g = -0.20 95% CI -0.33, -0.07, MCID -9%, NNT 9) and physical function (per-protocol g = 0.37 95% CI 0.21, 0.52, MCID 15%; ITT g = 0.34 95% CI 0.25, 0.43, MCID 10%, NNT 5). CONCLUSION: Community-deliverable exercise improves pain and physical function in adults with the types of AORD included in the analysis. Dose-response as well as studies in those with other types of AORD is needed.