Evaluation of blood viscosity at high shear rate with a falling ball viscometer

Fons, Carmen; Brun, J.F.; Supparo, I.; Mallard, C.; Bardet, L.; Orsetti, A

doi:10.3233/ch-1993-13509

Cited by 24 publications

(10 citation statements)

References 8 publications

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“…Blood viscosity has been assessed using the falling ball viscometer MT 90 Medicatest. It was demonstrated a few years earlier that it was a valid method to assess plasma viscosities and also blood viscosities in human [11,12]. Moreover, Doffin et al [11] has demonstrated in a specific physical study that measurements of viscosities with the viscometer MT 90 are performed with a shear rate of 1000 s ±1 .…”

Section: Discussionmentioning

confidence: 99%

“…Measurements of hb and hp were performed at high shear rate (1000 s ±1 ) and 37 8C with a falling ball viscometer (MT 80 Medicatest, F-86 280 Saint Benoit, France) [2,11]. The coefficient of variation of this method ranged between 0.6 to 0.8 % [12]. Plasma was obtained via centrifugation at 4500 rpm for 5 min at 4 8C (Jouan, Saint Nazaire, France).…”

Section: Hemoglobin Saturationmentioning

confidence: 99%

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Is Hemoglobin Desaturation Related to Blood Viscosity in Athletes During Exercise?

Connes¹,

Bouix²,

Durand³

et al. 2004

Int J Sports Med

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Several studies have suggested that athletes with low hemoglobin saturation during exercise may experience impaired pulmonary blood gas exchange during maximal exercise. Blood viscosity may be implicated in exercise-induced pulmonary hemorrhage in race horses. We hypothesized that blood rheology may contribute to impaired gas exchange and reduced hemoglobin saturation during exercise in humans. A group of 20 highly trained endurance athletes participated in this study, 9 with low hemoglobin saturation during exercise (Low-SpO (2) group) and 11 with normal hemoglobin saturation (High-SpO (2) group). All subjects performed a progressive exercise test conducted to V.O (2max). Venous blood was sampled at rest, 50 % V.O (2max) and maximal exercise. Blood viscosity (etab) was measured at very high shear rate (1000 s (-1)) and 37 degrees C with a falling ball viscometer. The erythrocyte rigidity coefficient, "Tk", was calculated using the Dintenfass equation. At rest, no significant difference in etab was observed between the two groups (3.00 +/- 0.08 mPa . s vs. 3.01 +/- 0.04 mPa . s for the Low-SpO (2) and High-SpO (2) group, respectively). At 50 % V.O (2max) and maximal exercise, etab was higher in Low-SpO (2) (p < 0.01). Tk decreased in High-SpO (2) (p < 0.01) but remained unchanged in the other group during testing. The greater increase in etab in the Low-SpO (2) group during exercise may therefore have been due to the lack of reduction in Tk. As suggested by previous studies, the greater increase in blood viscosity in athletes with low hemoglobin saturation may lead to vascular shear stress. Whether this could impair the blood gas barrier and result in exercise-induced hypoxemia requires further study.

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Section: Discussionmentioning

confidence: 99%

Section: Hemoglobin Saturationmentioning

confidence: 99%

Is Hemoglobin Desaturation Related to Blood Viscosity in Athletes During Exercise?

Connes¹,

Bouix²,

Durand³

et al. 2004

Int J Sports Med

View full text Add to dashboard Cite

show abstract

“…However, this paper provided neither a derivation nor citation demonstrating that the average shear rate 327 is actually equal to half of the maximum shear rate. Nonetheless, these expressions have been used by 328 others to estimate the average shear rate on the falling ball, although Fons and co-workers mistakenly set 329 the parameter "e" equal to the difference in tube and ball diameters rather than radii (Fons et al, 1993).…”

Section: Calculationsmentioning

confidence: 99%

Assessment of solubility and viscosity of ultra-high molecular weight polymeric thickeners in ethane, propane and butane for miscible EOR

Dhuwe

Klara

Sullivan

et al. 2016

Journal of Petroleum Science and Engineering

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Natural gas liquid (NGL), a mixture consisting primarily of ethane, propane, and butane, is an excellent 17 enhanced oil recovery (EOR) solvent. However, NGL is typically about ten times less viscous than the 18 crude oil within the carbonate or sandstone porous media, which causes the NGL to finger through the 19 rock toward production wells resulting in low volumetric sweep efficiency in five-spot patterns or during a linear drive displacement. The viscosity of candidate polymeric NGL thickeners is measured with a windowed, close-clearance falling ball viscometer, and an expression for the average shear rate associated with this type of viscometer is derived. High molecular weight polydimethyl siloxane

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“…Both were measured at high shear rate (1000 s ±1 ) with a falling ball viscometer (MT 90 Medicatest, Saint Benoit, France) [1]. The coefficient of variation of this method ranged between 0.6 and 0.8% [18]. Hematocrit (H) was determined by microcentrifugation.…”

Section: Hemorheological Measurmentsmentioning

confidence: 99%

Blood Rheological Responses to Running and Cycling: A Potential Effect on the Arterial Hypoxemia of Highly Trained Athletes?

Galy¹,

Hue²,

Boussana³

et al. 2005

Int J Sports Med

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To investigate 1) the blood rheological responses to high training volume and 2) the potential effect of these responses on arterial hypoxemia induced during submaximal running and cycling, 10 triathletes performed an incremental cycle test, 20 minutes of running (R), and 20 minutes of cycling (C). All trials were performed at nearly 75 % of VO2max. Hematocrit (H), blood viscosity (etab), plasma viscosity (etapl), index of erythrocyte rigidity (Tk), changes in plasma volume (DeltaPV), pulmonary diffusing capacity (DLco), and arteriolized blood gas (PaO2) were measured before and after each trial. Pulse oxymetry (SpO2) and cardioventilatory data were collected continuously. A significant increase in etab, etapl, and H was noted after R and C with respect to pre-exercise, whereas DeltaPV decreased, with a greater decrease after C. Tk was significantly higher after R than after C. A significantly greater drop in DLco was noted after C compared with R. SpO2 decreased significantly more during R, as did PaO2. We conclude that blood rheological responses are specific to running and cycling. Cycling induced a sharp decrease in plasma volume, which could partially explain the greater DLco alteration. Running was characterized by an increase in Tk, which could be implicated in the severity of the drop in arterial oxygenation observed.

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Evaluation of blood viscosity at high shear rate with a falling ball viscometer

Cited by 24 publications

References 8 publications

Is Hemoglobin Desaturation Related to Blood Viscosity in Athletes During Exercise?

Is Hemoglobin Desaturation Related to Blood Viscosity in Athletes During Exercise?

Assessment of solubility and viscosity of ultra-high molecular weight polymeric thickeners in ethane, propane and butane for miscible EOR

Blood Rheological Responses to Running and Cycling: A Potential Effect on the Arterial Hypoxemia of Highly Trained Athletes?

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