The effect of heart rate on myocardial contractility during single and paired pulse stimulation "in vivo".
D000818:Animals; D001794:Blood Pressure; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000502:physiology*; D006339:Heart Rate; D006352:Heart Ventricles; D008297:Male; D009119:Muscle Contraction; D013997:Time Factors