Objective: To study the effects of L-carnitine on myocardial ischemia-reperfusion injury and energy metabolism in rats. Methods: Twenty-four Langendorff isolated heart models were randomly divided into three groups (n= 8 in each group) including control group (CON group) in which hearts were perfused for 65 min with oxygenized Krebs-Hensleit (K-H) buffer solution, L-CAR group in which hearts were first perfused for 15 min with K-H solution, then 5 mmol/L L-carnitine was added into K-H solution, after 20 min...