Dr. Guilherme Pinheiro Machado, MD, PhD, is a Resident in Cardiology at the Clinical Hospital of Porto Alegre. He received his Doctor of Philosophy from the Federal University of Rio Grande do Sul. His research interests are Cardiology, Cardiovascular Sciences, Internal Medicine, Heart Catheterization, Interventional Cardiology, Acute Myocardial Infarction, Atherosclerosis, Muscle Fatigue, and Sports Science.