Abstract des Autors

Changes in the concentration of different hormones were investigated in 6 experienced long-distance runners who were brought to an overtraining syndrome (OS) by increasing training volume (km) and intensity for seven weeks. When compared with the first week, <Insulin-like-growth-factor I> was lowered during the whole observation period by up to 20% (p<0.05). The ratio <Free Testosterone>/<Cortisol>, which is regarded as an indicator for an OS, increased during the first weeks but decreased significantly by up to 44% in the last weeks (p<0.05). During the last two weeks of the training period the "exercise-induced catecholamine-increase" (EICI, ratio catmax/catbasal) decreased significantly from 55 (initial value 12) to 3.7 after 7 weeks (p<0.05), indicating an exhaustion of the cat-secretion capacity. There was an inverse relation between EICI and the percentage of high intensity training. Verf.-Referat