Break up long sitting periods by getting up and moving
The most sedentary people had 2.6 times the mortality of the least sedentary, and longer uninterrupted sitting added a separate association. Around 60–75 minutes of moderate activity daily largely offset the excess mortality associated with sitting.
What it takes
Free and quick. Set a reminder if sitting makes you lose track of time.
What you may gain
A US observational cohort used accelerometers. The highest quarter for total daily sedentary time had HR 2.63 versus the lowest; the quarter with the longest uninterrupted sedentary bouts had HR 1.96 versus the shortest. Total sitting and bout duration were independently associated with mortality. A pooled analysis of over a million people found HR 1.59 for those sitting more than 8 hours daily with minimal activity versus those sitting less than 4 hours and being most active. About 60–75 minutes of daily moderate activity offset the excess. In the most active group, even more than 8 hours of sitting gave HR 1.04, not statistically different.
Context & considerations
The more dependable message is that activity matters more than sitting time; sufficient activity largely removes the association. The most sedentary groups include many people already ill, so HR 2.63 plainly includes some reverse causation. In the same pooled analysis, watching television over 3 hours daily remained associated with risk at all activity levels, though the threshold rose to 5 hours in the most active group.
Research & references
Diaz KM et al. (2017). Patterns of Sedentary Behavior and Mortality in U.S. Middle-Aged and Older Adults: A National Cohort Study. Annals of Internal Medicine. https://doi.org/10.7326/M17-0212 ; Ekelund U et al. (2016). Does physical activity attenuate, or even eliminate, the detrimental association of sitting time with mortality? A harmonised meta-analysis of data from more than 1 million men and women. Lancet. https://doi.org/10.1016/S0140-6736(16)30370-1