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Some previous research had suggested the answer was no. A 2016 study of over one million people found, on the contrary, that men and women needed to exercise moderately for about 60 to 75 minutes per day in order to reduce the side effects of sitting. .
This study, however, like most similar previous research, asked people to remember how much they moved or seated, which can be problematic. We tend to be unreliable narrators of our lives, overestimating physical activity and underestimating how well we sit. But if a lot of people remember this way incorrectly, the paradoxical result is that exercise seems less powerful than it is, because the “active” people in the studies seem to have needed a lot of exercise. to achieve health benefits, when the amount of objective exercise actually completed was less, and that smaller amount produced gains.
So for the new study, which was published last week in a special issue of the British Journal of Sports Medicine devoted to the World Health Organization’s updated physical activity guidelines and related research, many The 2016 review authors decided, in effect, to repeat previous research and analysis, but, this time, use data from people who had worn activity monitors to objectively track how well they moved and sat.
Scientists ended up collating the results of nine recent studies in which nearly 50,000 men and women wore accelerometers. The volunteers in these studies were middle-aged or older and lived in Europe or the United States. Combining and collating data from the nine studies, the scientists found that most volunteers sat a lot, on average nearly 10 hours a day, and many barely moved, exercising moderately, usually walking. , for as little as two or three minutes a day. day.
Researchers then checked death records for about a decade after people joined their respective studies and began to compare lifestyles and lifespans. By dividing people into thirds, based on how they move and sit, the researchers found, unsurprisingly, that being extremely sedentary was dangerous, with people in the upper third to sit down and the lower third. for the activity having about 260% more probability of premature death than the men and women who moved the most and sat the least. (The researchers controlled for smoking, body mass, and other factors that might have influenced the results.)
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