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  • Articles: DFG German National Licenses  (2)
  • Aerobic power  (1)
  • Potentiometrische Titration  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of applied physiology 64 (1992), S. 292-297 
    ISSN: 1439-6327
    Keywords: Aerobic power ; Anaerobic power ; Training
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Seven female and eight male elite junior skaters performed cycle ergometer tests at four different times during the 1987/1988 season. The tests consisted of a Wingate-type 30-s sprint test and a 2.5-min supramaximal test. The subjects were tested in February, May and September 1987 and in January 1988. Maximal oxygen consumption was measured during the 2.5-min test. With the exception of the maximal oxygen consumption of the women in May which was about 6% lower than in the other three tests, no seasonal changes in the test results could be observed —this, in spite of a distinct increase in training volume (from 10 to more than 20 h · week−1) and training intensity in the course of the season. When the test data were compared to those of elite senior skaters, it appeared that the junior skaters showed the same values for mean power output during the sprint test [14.2 (SD 0.4) W · kg−1 for the men and 12.6 (SD 0.5) W · kg−1 for the women] and maximal oxygen consumption [63.1 (SD 2.8) ml· kg−1 · min−1 for the men and 55.3 (SD 3.5 ml · kg−1 · min−1 for the women, respectively] as found for senior skaters. It seemed, therefore, that the effects of training in these skaters had already levelled off in the period before they participated in this investigation. In contrast to previous studies, no relationship could be shown between the test results and skating performance. This was most likely due to the homogenous character of the groups (mean standard deviations in power and oxygen consumption were only 5%). It was concluded that the present cycle tests used to measure aerobic and anaerobic power were obviously not of use in evaluating seasonal changes in performance in these groups of highly trained athletes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 289 (1978), S. 102-105 
    ISSN: 1618-2650
    Keywords: Best. von Uran ; Potentiometrische Titration ; 2–25 mg, automatisch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A precise and accurate potentiometric titration of 2–25 mg of uranium is described. The uranium is reduced to U(IV) according to the method of Eberle et al. [3], and titrated with 0.05 N potassium dichromate, using a platinum indicator electrode. During the sample preparation the walls of the titration vessel are cleaned by centrifugation. To avoid overshoot of the set point a special differentiator is described, that interrupts the titration until equilibrium is reached. The precision of the method is 0.02%, the accuracy is better than 0.04% rel. Each titration takes 5 min.
    Notes: Zusammenfassung Das Uran wird nach Eberle et al. [3] zu U(IV) reduziert und mit 0.05 N Kaliumdichromatlösungtitriert, wobeider Endpunktmittels einer Platinelektrode indiziert wird. Während der Probevorbereitung wird das Titrationsgefäß zentrifugiert, um die Wände zu reinigen. Eine Überschreitung des vorgewählten Endpunktes wird verhütet, indem ein spezieller Differentiator die Titration unterbricht, bis sich das Gleichgewicht eingestellt hat. Die Reproduzierbarkeit des Verfahrens beträgt 0,02% relativ, die Genauigkeit ist besser als 0,04% relativ. Die Zeitaufwand beträgt 5 min pro Titration.
    Type of Medium: Electronic Resource
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