How does a patient increase ejection fraction naturally?

The short version: exercise works as well as any pill for these patients, and the evidence is surprisingly good.

The 2015 study in 40 obese patients with heart failure and normal ejection fraction found something worth knowing. Those who lost just 2% of body weight cut their rehospitalization rate from 35% to 17% over a year. Their exercise capacity improved and their diastolic function got better too [1]. The kicker: this was weight loss alone, no drugs, no surgery.

The type of exercise matters. A 1987 Mayo Clinic study of patients with severe heart failure (ejection fraction 25% or less) put them through an 8-week cardiac rehab program. Survivors exercised about 40 minutes five times a week. Their functional capacity measured in METs jumped from 6.5 to 8.9, a 37% improvement [2]. A 2017 meta-analysis of resistance training found it boosted peak oxygen uptake by about 3.6 ml/kg/min, comparable to what aerobic exercise does [3]. High-intensity interval training in heart failure patients produced even larger gains: one 12-week program improved peak VO2 by 46% compared to 14% for moderate continuous training [6].

But here is what the studies do not show. The 1982 trial in 15 post-heart attack patients found that despite big improvements in exercise capacity, the actual left ventricular function did not change. The heart pumped the same. What improved was the periphery: muscles learned to use oxygen better [5]. That matters because it means ejection fraction itself may not budge even when you feel much better and live longer.

The 10-year study of moderate exercise in chronic heart failure is the most striking. The trained group had a hazard ratio of 0.64 for hospital readmissions and 0.68 for cardiac death compared to the non-trained group [4]. Those are numbers that would make any drug company rich.

My call: exercise is the most evidence-based natural intervention for heart failure. It improves function, hospitalizations, and survival even when ejection fraction stays the same. Confidence: high.