A non-invasive direct method to estimate critical power in cycling - Girard, A.; Grappe, F.; Bertucci, W.; Perrey, S.; Dugue, B.; Rouillon, J. D. (Book of abstracts of the 6th annual congress of the European College of Sport Science, 15th congress of the German Society of Sport Science. Cologne, 24-28 July 2001, 2001)