Sitting More Than 12 Hours In A Day Increases Risk Of Death

Another Study Ties Sitting to Mortality Risk

Turns out, those who moved the least - sitting more than 13 hours per day - and who sat around for an hour to 1.5 hours at a time had a almost two-fold increase in death.

"We tend to think of sedentary behavior as just the sheer volume of how much we sit around each day". He further explained exercise guidelines are exact.

Barry A. Franklin, PhD, director of Preventive Cardiology and Cardiac Rehabilitation at William Beaumont Hospital in Royal Oak, Michigan, who was not involved with the study, told MedPage Today that the findings support recent studies which suggest that intermittent low-intensity standing throughout the day may be as important for disease prevention and optimization of health as is structured exercise.

But then Diaz and crew divided this giant couch-warming cohort into four different quartiles based exclusively on movement (that is, non-sitting) patterns-and they waited several years to see whether mortality outcomes differed between the groups. The subjects were black and white and were taking part in a US-wide national investigation on racial and regional influences on stroke.

In fact, too much sitting could double increase the risk of dying over a four-year period compared to those who sit only for shorter periods. On average, the participants were sedentary for more than 12 hours of a 16-hour day stretch (when you're awake), usually sitting around for about 11 and a half minutes at a stretch. He also reiterated that as we grow old our physical and mental functions reduces. Diaz noted that the higher average on his study is likely because they focused on a middle- and older-aged population, and because the data was monitored and tracked, rather than self-reported.

Based on their results, they suggest that current physical activity guidelines should be adjusted to include recommendations that target and reduce long periods of sedentary behavior.

And the same was true for longer sitting stretches.

After taking into account a host of factors including age, sex, education, smoking and high blood pressure, the team found that both the overall length of daily inactivity and the length of each bout of sedentary behaviour were linked to changes in the risk of death from any cause.

In future randomized experiments, Dr. Diaz and his colleagues hope to better parse how often and how much people need to move during breaks in order to lessen sitting's risks, and whether standing by itself is effective or we must move about. Subjects who kept the majority of their seated periods to less than 30 minutes had the lowest risk of death.

Nowadays, many people spend most of their day sitting down, as they have to work in an office and at a desk.

Alter is funded by a Chair in Cardiovascular and Metabolic Rehabilitation, University Health Network-Toronto Rehabilitation Institute, University of Toronto.

Alter, who did not contribute to Diaz's research, said some scientists theorize that more sitting leads to reductions in insulin sensitivity, while others believe net calorie expenditures decline as sitting increases. It also used data about deaths from any cause, which might have included automobile or other accidents unlikely to have been affected by sedentary time.

"Some of the most promising evidence suggests prolonged sedentary periods disrupts how our bodies control blood glucose [or blood sugar] levels". The study found that it is not just the amount of time spent sitting, but also the way in which sitting time is accumulated during the day, that can affect risk of early death.

Forty-eight percent of the time sitting was spent in a bout for longer than 30 minutes, and 28 percent of the time was spent sitting for at least an hour.

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