Mix and match
Dr. Giovannucci noted that the joint effects of the two types of exercise on mortality have not been studied and “there are some questions, for example, about whether doing a lot of moderate activity is sufficient or can you get more benefits by doing vigorous activity also.”
Joint analyses of both exercise intensities found that additional vigorous physical activity was associated with lower mortality among participants with insufficient (less than 300 min/week) levels of moderate exercise but not among those with at least 300 min/week of moderate exercise.
“The main message is that you can get essentially all of the benefit by just doing moderate exercise,” Dr. Giovannucci said. “There’s no magic benefit of doing vigorous [exercise]. But if someone wants to do vigorous, they can get the benefit in about half the time. So if you only have 2-3 hours a week to exercise and can do, say 2 or 3 hours of running, you can get pretty much the maximum benefit.”
Sensitivity analyses showed a consistent association between long-term leisure physical activity and mortality without adjustment for body mass index/calorie intake.
“Some people think the effect of exercise is to lower your body weight or keep it down, which could be one of the benefits, but even independent of that, you get benefits even if it has no effect on your weight,” he said. “So, definitely, that’s important.”
Dr. Michos pointed out that vigorous physical activity may seem daunting for many individuals but that moderate exercise can include activities such as brisk walking, ballroom dancing, active yoga, and recreational swimming.
“The nice thing is that you can really combine or substitute both and get just as similar mortality reductions with moderate physical activity, because a lot of patients may not want to do vigorous activity,” she said. “They don’t want to get on the treadmill; that’s too intimidating or stressful.”
The study was supported by the National Institutes of Health. The authors and Dr. Michos report no relevant financial relationships.
A version of this article first appeared on Medscape.com.