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. . PHYSICAL EXERCISE AND FITNESS INTERVENTIONS: Do Physical Activity Interventions Also Decrease Sedentary Time? . . Do Physical Activity Interventions Also Decrease Sedentary Time ? By Travis Saunders, Phd, MSc, CEP Posted: October 21, 2014 PLOS Blogs Obesity Panacea http://blogs.plos.org/obesitypanacea/2014/10/21/ do-physical-activity-interventions-also-decrease-sedentary-time/ . A shorter URL for the above link: . http://tinyurl.com/n4zm9dy . . Background: . Physical activity has long been established as a strong predictor of cardiometabolic health, disease and mortality. For decades now researchers have been trying to develop interventions that will increase our physical activity levels, most notably at higher intensities - think moderate-to-vigorous physical activity (otherwise known as MVPA). In Canada, we have physical activity guidelines which promote that adults (18-64 years) aspire to achieve a minimum of 150 minutes of MVPA per week in bouts of 10 minutes or more, with the idea that more physical activity is always better. Canadians also have sedentary behaviour guidelines for children and youth which propose limits on screen time. . There is a rapidly growing body of literature which suggests that greater amounts of time spent being sedentary (watching TV, screen time, sitting time, total sedentary time) are associated with an increased risk for markers of cardiometabolic disease, cardiovascular disease, diabetes, some cancers and premature death (references here and here). Sedentary behaviours refer to the time spent sitting or lying down and in a state where there is relatively minimal energy expended (not just the absence of MVPA). . While there has been a lot of research looking at the effectiveness of physical activity interventions, little has been done to examine whether these interventions also decrease the time we spend being sedentary. . snip . Take-home messages The results of our review provide a comprehensive and objective summary of the effectiveness of physical activity and/or sedentary behaviour focused interventions on reducing time spent being sedentary among adults. Ultimately the greatest reductions were observed in the sedentary behaviour focused interventions, but it remains to be seen whether these reductions can be maintained in the long term. Further, the reductions observed in the intervention with some sedentary behaviour component also likely lead to clinically meaningful reductions in cardiometabolic disease risk. . Given that it is likely easier for individuals to reallocate time spent being sedentary to light intensity physical activity (more incidental movement), and that beneficial changes in metabolic health can be achieved with these reallocations, reducing sedentary behaviours in addition to increasing MVPA is an important public health message. Interventions which placed an increased focus on these behaviours are more likely to see reductions in sedentary time. . . The complete article may be read at the URL above. . . 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