Study Links 2 Hours of Weight Training to 20% Lower Heart Disease Risk in Women

Q: If you lift weights but sit all day, is your heart still at risk?

Yes. Weightlifting helps, but it does not cancel out the heart risks of sitting for most of the day. The new JACC study found that women who did at least two hours of resistance training a week had lower risks of major cardiovascular disease and heart attack. But the same research also showed the lowest risks were in women who combined resistance training, aerobic exercise, and less sedentary time. In other words, lifting weights was protective, but it worked best as part of a broader movement pattern. That fits with wider evidence showing prolonged sitting is its own cardiovascular risk factor, even in people who exercise. Long, uninterrupted sitting can slow blood flow, worsen blood sugar and fat metabolism, stiffen blood vessels, and raise low-grade inflammation. Studies suggest exercise can reduce some of that harm, but not fully erase it, especially when sedentary time is very high. The practical message is not “work out once, then sit all day.” It is “exercise and keep moving.” Current U.S. guidance supports both at least 150 minutes a week of moderate-to-vigorous aerobic activity and at least two days of resistance training. Experts also advise breaking up sitting every 20 to 60 minutes with a few minutes of walking, standing, stairs, or light mobility work. So if you lift weights but remain sedentary the rest of the day, your heart risk is still higher than it would be if you also added regular aerobic activity and reduced prolonged sitting.

3 articles · Updated · Connected to India · Jul 3

A JACC study of 117,025 women found those doing at least 2 hours of resistance training a week had a 20% lower risk of major cardiovascular disease and a 44% lower risk of heart attack.
Each extra hour of weekly strength training was tied to a 5% drop in major cardiovascular disease risk and a 14% drop in heart attack risk, while the link to stroke was not significant.
Benefits persisted even among women already meeting the 150-minute aerobic exercise target; combining both was associated with a 45% lower heart attack risk versus no physical activity.
The lowest risks for major cardiovascular disease, heart attack and stroke appeared in women who combined resistance training, aerobic activity and limited TV viewing, underscoring overall movement patterns rather than any single habit.
Researchers said the findings support adding strength training to public-health prevention strategies for women, though the study relied on self-reported exercise data and had limited participant diversity.