Abstract

Hematologic parameters and serum ferritin levels were measured in groups of experienced ultra-marathon runners under control conditions, 2 days after a 160-km ultra-marathon, and for up to 14 days after a 56-km ultra-marathon. Under resting conditions, 14 of the runners had subnormal serum ferritin levels compared to 2 of a control group and not one of a group of trained swimmers. Serum ferritin levels that were markedly elevated after both ultramarathon races returned to pre-race levels only 6 days after the 56-km ultramarathon and continued to fall in athletes who did not exercise for a further 8 days. Other hematologic changes that were present after either of the ultramarathon races included: immediate post-race hemoconcentration (shown by increased mean red cell count, hemoglobin level, and packed cell volume) and increased mean corpuscular volume, followed by hemodilution that was greatest 48 h after the 160-km race; an increased mean corpuscular hemoglobin concentration and reticulocyte production index; transient leukocytosis, monocytosis, lymphocytopenia, eosinophilopenia, and the appearance of band cells. With the exception of the increased reticulocyte production index and the reduced packed cell volume, all other hematologic parameters had returned to control levels 6 days after the 56-km race. Verf.-Referat