Abstract des Autors

40 subjects carried out two different incremental tests on the crank ergometer. One for the determination of the Conconi threshold (CT) the other for the 4 mmol/l lactic acid concentration (LT). Furthermore, every subject carried out 3-5 endurance works over 30 min in the range of the CT. Measured parameters were lactic-acid (LA) and heart frequency (HF). The main results are: 1) In 13 (32.5%) out of 30 Conconi tests, because of the linearity of the curve, no HF-deflection point could be found. 2) The correlation between cT and LT is highly significant ( r = 0.964). 3) The average CT value exceeds the one of the LT by 14.6 Watt. 4) During the prolonged work in the range of the CT (>90-100%) lactic acid values are measured between 2 and 11 mmol/l. According to our results, the method of threshold determination with the help of the HF-deflection point has a less precise possibility of differentiation. Therefore, it seems to have only a limited qualification for diagnosis of performance and the purpose of restraining the training of canoeers. Verf.-Referat