Effects of acute and chronic hematocrit modulations on blood viscosity in endurance athletes

Clinical Hemorheology and Microcirculation
Aurélien PichonPaul Robach

Abstract

The aim of the present study was to investigate the effects of manipulating hematocrit by different methods (acute exercise, training or isovolumic hemodilution) on blood viscosity in high-level aerobic endurance athletes. We hypothesized than increasing hematocrit does not always cause a rise in blood viscosity.Sixteen endurance athletes underwent maximal exercise before and after 4 weeks of training with (LHTL; n = 10) or without (placebo; n = 6) Live High-Train Low modalities. Total hemoglobin mass was measured before and after training by a carbon monoxide rebreathing technique. After training, subjects performed two maximal exercise bouts separated by isovolumic hemodilution (phlebotomy and/or plasma volume expander) to readjust red blood cell volume and plasma volume to baseline values. Blood samples were obtained before and after exercise to assess hematocrit and blood and plasma viscosity.Training session (LHTL and placebo) increased hematocrit (Hct) in all subjects but without any significant change in blood viscosity. The decrease in plasma viscosity in all groups may explain this result. Isovolumic hemodilution caused a drop of Hct without any significant change in blood viscosity at rest. Maximal exercise increased ...Continue Reading

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Citations

Oct 22, 2016·Clinical Hemorheology and Microcirculation·Jean-Frédéric BrunEric Raynaud de Mauverger
Apr 18, 2018·Clinical Hemorheology and Microcirculation·Jean-Frédéric BrunEric Raynaud de Mauverger
Sep 30, 2018·The Journal of Experimental Biology·Kang Nian YapTony D Williams
Mar 26, 2019·Clinical Hemorheology and Microcirculation·Agostino GnassoConcetta Irace
May 2, 2018·Clinical Hemorheology and Microcirculation·Jean-Frédéric BrunEric Raynaud de Mauverger
Sep 15, 2017·Journal of the American College of Nutrition·Fernando NaclerioBirthe V Nielsen

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