Harvard University - Department of Surgery, Harvard University - Department of Surgery, Harvard University - Department of Surgery, Harvard University - Department of Medicine, Harvard University - Department of Surgery, Harvard University - Department of Surgery, Harvard University - Department of Surgery, University of Toledo - Department of Physiology & Pharmacology, University of Michigan - Department of Anesthesiology, Norwegian University of Science and Technology (NTNU) - Cardiac Exercise Research Group at the Department of Circulation and Medical Imaging, University of São Paulo (USP) - School of Physical Education and Sport and Harvard University - Department of Surgery