Katrine Rolid is a senior Physiotherapist at Oslo University Hospital. She is currently a PhD candidate at the Institute of Clinical Medicine at the University Oslo and the Department of Cardiology at Oslo University Hospital. Her special field of interest is exercise testing, exercise interventions and health-related quality of life after heart transplantation. She is one of the main researchers in the randomized controlled study; the HITTS study (High-intensity Interval Training in De Novo Heart Transplant Recipients in Scandinavia).