title: Force-frequency relationship. A basis for a new index of cardiac contractility?
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002302:Cardiac Output; D004548:Elasticity; D006321:Heart / Q000502:physiology*; D009119:Muscle Contraction; D009206:Myocardium / Q000166:cytology; D009210:Myofibrils; D010210:Papillary Muscles / Q000166:cytology / Q000502:physiology; D011817:Rabbits