Physical Activity, Any Type or Amount, Cuts Health Risk from Sitting
About one in four adults spends more than eight hours a day sitting, according to a recent study.
In a previous paper, Diaz and his team discovered that adults who sat for long stretches at a time—an hour or more without interruption—had a greater risk of early death than those who were sedentary for the same total amount of time but got up and moved around more often. They also found that people who sat for less than 30 minutes at a time had the lowest risk of early death, suggesting that taking movement breaks every half-hour could lower your risk of death.
But just how intense, and for how long, does the physical activity need to be to counter the ill effects of sitting?
The current study included 7,999 individuals, age 45 and older, who took part in a national investigation of racial and regional disparities in stroke between 2009 and 2013. The individuals wore activity monitors for at least four days to record the amount and intensity of physical activity they engaged in while awake. The researchers tabulated the death rate among participants through 2017. Using this data, they estimated how substituting time spent sitting with time being physically active would affect risk of early death.
The study found that replacing just 30 minutes of sitting with low-intensity physical activity would lower the risk of early death by 17 percent, a statistically significant decrease. Swapping the same amount of sitting for moderate to vigorous activity would be twice as effective, cutting the risk of early death by 35 percent. The researchers also found that short bursts of activity—of just a minute or two—provided a health benefit.
“If you have a job or lifestyle that involves a lot of sitting, you can lower your risk of early death by moving more often, for as long as you want and as your ability allows—whether that means taking an hour-long high-intensity spin class or choosing lower-intensity activities, like walking,” Diaz says.
While the study estimated the degree to which the risk of dying from any cause could be cut by swapping sitting for movement, it did not look at specific health-related outcomes.
“In our next study, we plan to look at the risk of specific cardiovascular outcomes, such as heart attack, heart failure, and cardiovascular-related deaths, associated with physical activity versus sedentary behavior,” Diaz says.
Contacts and sources:
Columbia University Irving Medical Center
Citation: Potential Effects of Replacing Sedentary Time With Short Sedentary Bouts or Physical Activity on Mortality: A National Cohort Study.
Keith M Diaz, Andrea T Duran, Natalie Colabianchi, Suzanne E Judd, Virginia J Howard, Steven P Hooker. American Journal of Epidemiology, 2018; DOI: 10.1093/aje/kwy271
Source:
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