Association of Total Daily Physical Activity and Fragmented Physical Activity With Mortality in Older Adults

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Abstract
Physical activity benefits health and quality of life, particularly for adults aged 65 years and older.1 With aging, functional capability declines, physical activity decreases,2 and mortality risk increases. Previous research3,4 shows that volume and/or intensity measures of physical activity are associated with mortality risk, but technological advances (eg, accelerometers) present the possibility to evaluate and test whether detailed patterns of activity may be more informative to health outcomes than traditional measures of total activity, thus providing an earlier marker of future health and longevity.5 This is particularly important with regard to older adults, who are one of the most sedentary and rapidly growing segments of the US population.6

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