Short-term effects of prolonged strenuous endurance exercise on the level of haematocrit in amateur cyclists

International Journal of Sports Medicine
G NeumayrH Hoertnagl

Abstract

Knowledge is sparse about the extent of potential dehydration due to prolonged strenuous cycling and its haematological acute effects on the haematocrit (Hct) in study populations credibly not taking any kind of doping. With increasing training load levels of Hct and haemoglobin (Hb) decrease in both amateurs and professionals as a long-term consequence due to expanded plasma volume (PV). On a short-term basis, however, counteracting dehydration potentially brought about by endurance exercise may cause a rise in Hct bringing competitive cyclists into conflict with the current condition regulations and Hct cut-off of 50 % set by the International Cycling Union (UCI) in its fight against erythropoietin (rhEPO) doping. On the other hand adequate and sufficient fluid substitution being substantial for a successful endurance performance should prevent any pronounced Hct rises. To study the haematological acute effects of prolonged strenuous cycling we measured Hct, Hb, red blood cell (RBC) count and plasma protein in a reliably 'clean' population of 38 well-trained male amateur cyclists before, immediately after and one day after an extraordinary ultramarathon. The pre-race levels of Hct, Hb and RBC count were placed in the lower ra...Continue Reading

Citations

Aug 13, 2011·European Journal of Applied Physiology·Che-Fu LinRong-Sen Yang
May 7, 2010·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·Laura A GarvicanChristopher J Gore
Jan 31, 2004·British Journal of Sports Medicine·G NeumayrH Hoertnagl
Mar 18, 2008·Journal of the American Veterinary Medical Association·Michael S DavisKatherine K Williamson
Jan 24, 2018·Research in Sports Medicine·Pedro L ValenzuelaPedro de la Villa
Jul 19, 2003·Arteriosclerosis, Thrombosis, and Vascular Biology·Maciej TomaszewskiAnna F Dominiczak
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Apr 3, 2004·Nature Reviews. Drug Discovery·Neil Ruderman, Marc Prentki
Jun 6, 2021·Hormone Molecular Biology and Clinical Investigation·Sayad KocahanYucehan Yilmaz

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