Heart size adaptations to resistance training
Studies of strength-trained athletes have shown that there is an increase in left ventricular wall thickness, absolute left ventricular wall mass, and septum (wall separating the left and right ventricles) wall thickness with resistance training (Stone et al., 1991) , as contrasted by increases in volume of the left ventricular chamber seen with aerobic-trained individuals. The extent to which the changes in the heart size from resistance training may affect cardiac output, stroke volume and heart efficiency are currently unknown.