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High endurance athletes have very high Ejection fractions at peak exercise, sometimes nearly 90%, but slightly lower EFs than non athletes at rest, at least this my understanding from the literature I read sometime ago. If I can find a site on it I'll post it. Hypertrophic Cardiomyopathy(HCM)very thickened left ventricular walls ususally due to a genetic or familial predisposition is associated with a very high ejection fraction at rest, usually walls of 20mm(2cm) or more.