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Archived Comments for: 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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  1. Cause vs effect...

    Gershom Lundberg, Crawford and Lundberg X-Ray Clinic

    11 April 2007

    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