Steady Aerobic Exercise Raised Fitness on Average in Heart Disease Patients

The study is a meta-analysis, which pools results from many randomized controlled trials. It was published in 2026 in the Journal of Cardiovascular Development and Disease by Kelley GA, Kelley KS and Stauffer BL. It covered 1,383 adults with coronary heart disease: 725 who did continuous aerobic exercise and 658 who served as controls. Continuous aerobic exercise means steady-state activity rather than short bursts.

On average, exercise raised peak oxygen uptake, known as VO2peak, by 3.6 mL per kg per minute compared with controls (95% confidence interval 2.8 to 4.4). VO2peak is a standard measure of cardiorespiratory fitness. The authors call a gain of 1.0 or more clinically important, so this result clears that bar.

Why does this matter? The authors note that higher fitness has been linked to lower death rates in people with coronary heart disease. A previous review they cite reported a 68% lower risk of death from any cause. That is an association, and this study did not test it.

The second question was about differences between people. Precision exercise medicine rests on the idea that people respond to exercise very differently, so each person needs a tailored plan. But the gains people show can differ simply because of measurement error and day-to-day changes in diet, activity and other factors, not because of exercise itself.

To separate the two, the team used a method that compares how widely results vary in the exercise group against the control group. If exercise truly affected people differently, the exercise group should vary more. It did not. The estimated true difference in response was 0.9 mL per kg per minute, with a confidence interval of −1.5 to 2.0 and a prediction interval of −2.4 to 2.7. Those ranges include zero. The authors conclude that no exercise-associated variation in response was seen once chance was properly accounted for.

In plain terms, the data do not support the idea that some people with heart disease are true non-responders to steady aerobic exercise. Average gains looked fairly similar from person to person once chance was removed. This does not prove that every individual benefits, and the study measured fitness change, not whether anyone should start or stop exercising.

There are limits, and this is where the argument is weakest. Using the GRADE system, the authors rated the certainty of the evidence as low. The study reused data from an earlier umbrella review of trials, and it covered only continuous aerobic exercise compared with controls. The authors also say that, aside from personal preferences such as walking or cycling, general exercise recommendations from heart organizations may suffice.

This piece adds to, rather than contradicts, our October 20 report on a different review, which found that adding strength training to cardio may do more in heart rehab. That work looked at which type of exercise to do. This study asks whether aerobic exercise works for most people at all.

Larger, higher-quality trials will show whether these findings hold and whether other exercise types behave the same way.

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