Abstract des Autors

A study was conducted on two groups of trained and untrained cyclists whose capacity had been determined prior to the tour by bicycle ergometry. Blood samples were taken in the morning before, during and after tour. In the untrained cyclists, a higher strain was determined by heart rate monitoring during the tour. In both groups, free testosterone decreased during exercise and increased during regeneration. At the beginning of the tour, cortisol rose in both groups. In the untrained cyclists, cortisol secretion decreased during the tour. Creatine kinase was constant in the trained and, in the untrained cyclists increased to twice the amount recorded at beginning, and even more during the main phase. The course of cortisol and creatine kinase interpreted as overstrain reactions in the untrained cyclists. Verf.-Referat