The purpose of this study was to examine the relationship between two common sedentary behaviours, such as riding in a car and watching television (TV), and cardiovascular disease (CVD) mortality in 7,744 men from the Aerobics Center Longitudinal Study (ACLS). Results revealed that TV watching, riding in a car, and these combined sedentary behaviours were significantly associated with risk of CVD mortality after adjustment for age. However, multivariate-adjusted analysis showed no association between TV watching and CVD mortality risk. Riding a car (>10 hours/week) and the two sedentary behaviours combined (>23 hours/week) remained significantly associated with 48% and 37% increased risk of CVD mortality, respectively, as compared with the referent groups (<4 and <11 hours/week). The authors also found that for any given amount of time spent driving, men who were physically active maintained lower CVD mortality rates than men who were classified as physically inactive. Thus, these findings support the importance of not only increasing physical activity levels but also limiting sedentary behaviours in order to reduce the risk of CVD mortality.
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