Disability is a leading driver of healthcare costs, accounting for more than one in four dollars spent on healthcare. Medical spending among older adults is more strongly related to the presence of disability than to remaining life expectancy. More than 18% of people in the United States were classified as disabled in 2010, at an estimated annual cost of $357bn (£214bn; €259bn). Participation in physical activity is a low cost, broadly applicable approach to improve health outcomes and reduce the risk of developing chronic disease.
Randomizedcontrolled trials in adults show that increased physical activity is effective in reducing disability. Guidelines recommend 150 minutes each week of moderate to vigorous physical activity, but whether that intensity or time is needed to reducedisability is not known. In the absence of randomized clinical trials to evaluate a dose-response between time spent in specific intensities of physical activity and disability, to inform public health interventions we examined this question by using longitudinal data from community dwelling adults at elevated risk of disability due to osteoarthritis of the knee or risk factors for knee osteoarthritis (such as obesity).
The full study can be found here-
http://www.bmj.com/content/348/bmj.g2472
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