Research article
Relationship between physical activity and stiff or painful joints in mid-aged women and older women: a 3-year prospective study
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* Corresponding author: Kristiann C Heesch kheesch@hms.uq.edu.au
Arthritis Research & Therapy 2007, 9:R34 doi:10.1186/ar2154
Cause vs effect...
Gershom Lundberg (2007-04-11 16:42) 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.
Competing interests
none
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