The quality of evidence is downgraded by study limitations (unclear allocation concealment and lack of blinding), and by inconsistency (variability in results).
A Cochrane review [Abstract] 1 included 14 studies with a total of 1 579 subjects with ankylosing spondylitis (AS). Exercise therapy programmes were compared with an inactive control (waiting list, advice, no exercise) in 9 studies and with usual care in 5 studies (participants could practice exercises as usual). Most exercise programmes were delivered in conjunction with drug therapy (standard NSAIDs, disease-modifying anti-rheumatic drugs (DMARDs), or biological agents).
Abstract in McMaster database (licence required)
Abstract and full text in Cochrane database http://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD011321.pub2/full (licence for full text required)
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