Sedentary behaviors and physical inactivity are increasing globally and are widely regarded as critical risk factors for adverse health outcomes. In this report, Hoang and colleagues examined the effects of 25-year patterns of sedentary behavior and television viewing on midlife cognition function. 3247 adults (aged 18-30 years) enrolled in the Coronary Artery Risk Development in Young Adults (CARDIA) Study (years 1985 to 2011). Data analysis was performed June 1, 2014, through April 15, 2015.
Compared with participants with low television viewing, those with high television viewing during 25 years were more likely to have poor cognitive performance on the DSST and Stroop test, but not the Rey Auditory Verbal Learning Test (adjusted for age, race, sex, educational level, smoking, alcohol use, body mass index, and hypertension). Low physical activity during 25 years in 528 of 3247 participants (16.3%) was significantly associated with poor performance on the DSST. Compared with participants with low television viewing and high physical activity, the odds of poor performance were almost 2 times higher for adults with both high television viewing and low physical activity in 107 of 3247.
The study concluded that high television viewing and low physical activity in early adulthood were associated with worse midlife executive function and processing speed. The authors stressed that this is one of the first studies to demonstrate that such risk behaviors may be critical targets for prevention of cognitive aging even before middle age.
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Hoang TD, Reis J, Zhu N, Jacobs DR Jr, Launer LJ, Whitmer RA, Sidney S and Yaffe K: Effect of Early Adult Patterns of Physical Activity and Television Viewing on Midlife Cognitive Function. JAMA Psychiatry [Epub ahead of print 2015 Dec 2:1-8. doi: 10.1001/jamapsychiatry.2015.2468.]
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http://www.ncbi.nlm.nih.gov/pubmed/26629780

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