Similar to the chicken-and-egg debate, the cardio versus strength training debate can get heated—both when you're discussing heart health and weight loss or maintenance.

Most doctors and researchers agree with the weekly physical activity recommendations from the World Health Organization and the American Heart Association, which include a mix of both:

• 150 minutes of moderate-intensity activity or 75 minutes of vigorous-intensity exercise per week
• 2 days of full-body strength training per week

But a mounting body of research is proving that resistance training might be even better for your heart than many forms of cardio. The latest nugget of evidence comes by way of an Australian study published in the August 12 edition of the journal Hypertension Research. In addition to aerobic and dynamic resistance exercise (such as lunges or bicep curls), static strength training —known as isometric resistance training (IRT)—can effectively lower blood pressure.

As a refresher, blood pressure is important for all of us to have checked at least every two years because hypertension (or a blood pressure 130/80 mm Hg or above, per the AHA criteria) is one of the most common medical conditions in the United States. An estimated 45% of U.S. adults have the diagnosis, according to the latest data from the U.S. Centers for Disease Control and Prevention. The higher the blood pressure over normal, the greater the risk for heart attack or stroke, the CDC adds.

What is IRT?

So what is IRT, exactly? It's a style of strength training in which the muscles are challenged via a force, but without changing length. Think: A plank pose, a wall sit or holding a static lunge. As you may have noticed in those activity recommendations, IRT is not called out as part of the plan. This is likely because in decades past, trainers worried that the static nature of the moves, especially when performed at a high intensity, might cause blood pressure to jump too high during exercise (as the participant strains to hold the position for a long time).

But the University of New South Wales Sydney lead study authors Harrison Hansford and Matthew Jones, Ph.D., who are both accredited exercise physiologists, found in this study that IRT is more than safe for the heart. It's actually stellar at improving heart health. "We found that IRT was very safe and caused meaningful changes in blood pressure—almost as much as what you'd expect to see with blood pressure-lowering medications," Jones tells UNSW Sydney Newsroom. "It's possible we would see the same effects simply by asking participants to make a fist and squeeze it at a certain intensity for the prescribed amount of time."

Effects of IRT

Earlier research had hinted that IRT could be effective at lowering blood pressure, but this is the first to comprehensively examine the safety of IRT. And the researchers give a hearty thumbs-up to both. "We also found IRT caused improvements in other measures of blood pressure including central blood pressure (the pressure in the heart's largest artery, the aorta, and an important predictor of cardiovascular disease) and to a lesser extent ambulatory blood pressure (average blood pressure across a 24-hour period), neither of which had previously been reviewed," Jones says.

While this isn't to say you can drop your high-blood-pressure medications just yet—consult with your physician if you're being treated for hypertension—a well-balanced workout routine including cardio (walking, biking, spin class), dynamic strength training and IRT could be a recipe for success, in terms of heart health and general wellness.