BMJ : British medical journal
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To investigate whether objectively measured time spent in light intensity physical activity is related to incident disability and to disability progression. ⋯ These prospective data showed an association between greater daily time spent in light intensity physical activities and reduced risk of onset and progression of disability in adults with osteoarthritis of the knee or risk factors for knee osteoarthritis. An increase in daily physical activity time may reduce the risk of disability, even if the intensity of that additional activity is not increased.