title: [When fitness causes illness. Errors in training stress the immune system].
authors.forename: I C
authors.initials: IC
authors.lastname: Kreutzberg
mesh_terms: D015444:Exercise / Q000502:physiology*; D006801:Humans; D007108:Immune Tolerance / Q000276:immunology*; D010809:Physical Fitness / Q000502:physiology*; D012307:Risk Factors