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Ejection fraction can improve in some people on proper medical therapy. While exercise doesn't result in the significant improvement in heart function (in most studies) that we'd hope for, it can improve quality of life and functional capacity. I'd talk with the cardiologist about an exercise prescription and whether cardiac rehabilitation could be a possibility.
An ejection fraction is a measurement of the amount of blood pumped out during this second, emptying stage. Heart failure may be caused by problems with the heart's emptying phase, its filling phase or with both phases.