Marathon run: cardiovascular adaptation and cardiovascular risk A current compilation describes the cardiovascular risk for marathon runners. In the age group of 40-65 years, there is an increased risk of rhythm disorders.Although a marathon is an intensive physical stress with a burden on the cardiovascular system, there is still no circulatory death cases in the marathon. The interesting compilation can be found under https://pubmed.ncbi.nlm.nih.gov/24408890/