Harvard Heart Letter

Too much sitting linked to heart attack and stroke -- even if active

A report from the Women’s Health Initiative showed that women who sat for 10 or more hours a day were 18% more likely to have had a heart attack or stroke over a 12-year period than women who sat for five hours or fewer. While that’s not entirely surprising, the risk was increased even among women who sat a lot but got recommended levels of daily physical activity. Taken together with previous studies of sitting done in men and mixed groups, the findings suggest that prolonged sitting is a heart hazard for everyone. The other message from this line of research is that activity trumps sitting.
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