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Article type: Research Article
Authors: Brun, J.F. | Micallef, J.P. | Supparo, I. | Rama, D. | Benezis, C. | Orsetti, A.
Affiliations: Service d'Exploration Physiologique des Hormones et des Métabolismes, CHRU de Montpellier, F-34059 Montpellier, France | INSERM U103 (Biomechanics) Montpellier, France
Abstract: Correlations among values at rest of blood viscosity (MT 90, high shear rate), RBC Aggregation (Myrenne) and four markers of fitness were investigated in 21 professional football players during a triangular maximal exercise test. Maximal O2 uptake ($\dot{\mathrm{V}}$O2 max, directly measured) was correlated with resting plasma viscosity (r=−0.666 p<0.01) and blood viscosity at corrected hematocrit 45% (r=−0.426 p<0.05). The physical working capacity $\dot{\mathrm{W}}$170 was correlated with $\dot{\mathrm{V}}$O2max (r=0.645 p<0.01) and with both resting plasma viscosity (r=−0.524 p<0.02) and hematocrit (r=−0.524 p<0.05). Two determinants of the 4 mmol lactate threshold were found: red cell aggregation ‘M’ (r=−0.529 p<0.02) and ‘M1’ (r=0.477 p<0.05). Thus, markers of aerobic working capacity are negatively correlated with plasma viscosity and hematocrit, while the 4 mmol.l−1 lactate threshold which measures the ability to avoid blood lactate increase is negatively correlated to RBC aggregation.
Keywords: Blood viscosity, hematocrit, exercise, football, [TeX:] $\dot{\mathrm{V}}\mathrm{O}_{2}$ max hemorheology, erythrocyte deformability, erythrocyte aggregation, blood lactate
DOI: 10.3233/CH-1995-15207
Journal: Clinical Hemorheology and Microcirculation, vol. 15, no. 2, pp. 201-212, 1995
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