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(Received 13.7.1993; accepted 23.8.1993) Trained sportsmen have low values of blood viscosity (TJb). In this study we tested the functional consequences of this reduction of TJb in 34 sportsmen submitted to a 25 min progressively increasing submaximal work load. A low resting TJb (measured at high shear rate with the MT90 viscometer) was associated to a lower increase in blood lactate during exercise (correlation of llb with: maximal lactate value: r==0.357 p 2.4 mPa.s (with this method) had higher lactate increase (p

Faculte de Medecine, 34060 Montpelliel', France (Received 14.9.1991; accepted 14.11.1992) Metabolic modifications associated with the syndrome 'X' of Reaven (insulin resistance-hyperinsulinemja syndrome) might explain at least in par:t the rheologic changes of obesity. This hypothesis was investigated in 101 subjects (38 overweight (Ob+), 22 obese (Ob++) and 41 controls) during a standardiz.ed breakfast test. Baseline values of plasma viscosity (lIpl), blood viscosity at high shear rate, RBe filterability (Hanss' hemorheometre), hematocrit, RBe aggregation (Myrenne aggregometer) serum cholesterol and triglycerides were measured. When compared to controls, obese patients Ob+ and Ob++ had a higher he",atocrit (+2.5 % p

Received 20.12.1992; accepted 16.4.1993) We tested the accuracy and the usefulness of the MT90 (falling ball) viscometer as an alternative to more expensive and sophisticated devices for physiological and clinical investigations. This instruments measures viscosity from the velocity of a ball falling through a syringe filled with less than 1 ml of blood or plasma at a shear rate of 1000 s-1, Le. the range of the so-called 'newtonian' behavior of blood. We postulated that this shear rate allows us to measure RBC rigidity in a completely disaggregated structure. Four indices of RBC rigidity derived from high shear rate viscometry were used: 1J45r (Le. blood viscosity at corrected hematocrit 45% divided by plasma viscosity); 'Tk' (Dintenfass); 'k' (Quemada); 'IJ(RBC), (Breugel and coiL). All were strongly correlated to each other (r=0.98 p