Relationship between physical activity and stiff or painful joints in mid-aged women and older women: a 3-year prospective study

doi:10.1186/ar2154

Arthritis Research & Therapy

Volume 9
Issue 2

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Heesch KC
Miller YD
Brown WJ

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Miller YD
Brown WJ
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Comments(1)

Cause vs effect...

Gershom Lundberg (11 April 2007) Crawford and Lundberg X-Ray Clinic

Unless I misunderstand the structure of this research, there is no random assignment of participants to active vs inactive groups.

Therefore, it is unjustified to conclude that exercise is beneficial. It may simply be that women with arthritis pain are less active, BECAUSE they are in pain.

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Relationship between physical activity and stiff or painful joints in mid-aged women and older women: a 3-year prospective study

Cause vs effect...

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