Animals Aorta Aortic pressure Aortic wall energetics Biomechanics Cardiac Output Cardiology Coronary Circulation Coronary Vessels Counterpulsation Disease Models, Animal Energy dissipation Heart Failure Heart Rate Intra-Aortic Balloon Pumping Intra-aortic balloon pumping (IABP) Intra-aortic counterpulsation Models, Biological Physiological models Pressure Pressure effects Sheep Time Factors animal cell animal experiment animal model animal tissue aorta balloon aorta pressure aorta wall