Abstract des Autors

11 sprinters and decathletes took part in a field test geared to sprinters, during the preparation period (twice within a week) and during the indoor competition period. The test comprised 2x60 m sprints with maximal intensity and a 2-3x200 m graduated test. Levels of lactate and ammonia in the capillary blood were tested several times for each exercise. In the 3x200 m graduated test, a highly significant increase in the NH3 concentration was observed as a function of the running speed and there was a close correlation between lactate and NH3. When the tests were repeated, the reproducibility of the NH3 and NH3/lactate parameters was unsatisfactory, with mean coefficients of variation between 18.4% and 38.5%. This was probably largely due to the ammonia checker used for analysis. It remains to be seen therefore, whether these parameters can be usefully employed to determine the individual composition of muscle fiber. Verf.-Referat