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https://www.washingtonpost.com/news...-amount-of-exercising-theyre-doing/?tid=sm_tw
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If you're among of the millions of Americans who dutifully carve out 30 minutes a day for the moderate-intensity exercise recommended by experts based on the idea that you're doing all you can for your heart, you're in for some disappointing news.
A new analysis published Monday in the journal Circulation finds that that amount of activity may not be good enough.
For the paper, researchers reviewed 12 studies involving 370,460 men and women with varying levels of physical activity. Over a mean follow-up time of 15 years, this group experienced 20,203 heart failure events. Each of the participants self-reported their daily activities, allowing the team to estimate the amount of exercise they were doing.
They found that those following the 30-minutes-a-day guidelines issued by the American Heart Association had modest reductions in heart failure risk compared to those who did not work out at all.
But those who exercised twice and four times as much had a substantial risk reduction" of 20 percent and 35 percent, respectively.
The findings challenge the notion of a 30-minutes-a-day magic number for exercise. Instead, research found that physical activity and heart failure may be what they called "dose dependent," meaning that higher levels of physical activity appeared to be linked to a lower risk of heart failure. That association appeared to hold across age groups, gender and race.
Ambarish Pandey, the studys lead author and a cardiology fellow at the University of Texas Southwestern Medical School, said the study was limited in its ability to compare the relationship of heart failure risk with different types of physical activity, as well as in differentiating between work-related physical activity vs. exercise for leisure.
If someone runs to their work, that doesnt count as leisure, Pandey said. That counts as occupational. If someone is an exercise trainer, then he will be more active at his workplace and that may not be accounted for in the leisure activity that we have looked at.
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