Evaluation of hemoconcentration from hematocrit measurements.

Beaumont, William

doi:10.1152/jappl.1972.32.5.712

Cited by 441 publications

(233 citation statements)

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“…Venous blood samples were drawn from the right antecubital vein under standard conditions (for the determination of haematocrit and haemoglobin, and the calculation of %ÄPV) (Van Beaumont, 1972;Hagan et al 1978;Green et al 1987). Haematocrit was corrected (Green et al 1984) and haemoglobin was determined by the Coulter counter method (Coulter STKR).…”

Section: Measurementsmentioning

confidence: 99%

“…Haematocrit was corrected (Green et al 1984) and haemoglobin was determined by the Coulter counter method (Coulter STKR). The %ÄPV before (pre) compared to after training (post) was calculated using the equation of Van Beaumont et al (Van Beaumont, 1972) where: %ÄPV = 100Ï[(100 − Hctpre) − 100(Hctpre − Hctpost)]ÏHctpre. The %ÄPV estimated in this way has been shown to correlate closely with that determined by the radio-iodinated ( 131 I) technique (Green et al 1987).…”

Section: Measurementsmentioning

confidence: 99%

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Left Ventricular Diastolic Filling and Cardiovascular Functional Capacity in Older Men

Petrella¹,

Cunningham²,

Paterson³

2000

Experimental Physiology

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We investigated anaerobic threshold (< èL) gas exchange kinetics and maximal oxygen uptake (ýOµ,max) among older men with reduced left ventricular end-diastolic filling (LVDF). Ten men (mean age, 73 years) with LVDF impairment and low fitness, but without other cardiovascular dysfunction were studied. Treatments compared to control included: 5 days, high intensity exercise training protocol; 5 days, calcium channel blockade (240 mg verapamil); 21 days, detrainingÏwashout; and 5 days, combined treatments. Results indicated no changes in resting left ventricular systolic function with any treatment. Significant resting diastolic function changes included increased early:late flow velocity (control, 0.87; training, 1.28; verapamil, 1.32), and a decreased isovolumic relaxation time (control, 0.10 s; training, 0.08 s; verapamil, 0.08 s). The combined treatments were not additive. Sub-threshold oxygen uptake kinetics (ôVOµ, s) were significantly faster following either training or verapamil (ôVOµ,control, 62 ± 12; ôVOµ,training, 44 ± 9; ôVOµ,verapamil, 48 ± 10) and combined treatments (ôVOµ, 41 ± 8). ýOµ,max (ml kg¢ min¢) was significantly increased (control, 21.8 ± 2.2; training, 27.3 ± 2.2; verapamil, 25.2 ± 3.4; combined treatments, 26.9 ± 2.3). Increasing ventricular preload with either exercise training or calcium channel blockade was coincident with faster ôVOµ and increased ýOµ,max.

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Section: Measurementsmentioning

confidence: 99%

Section: Measurementsmentioning

confidence: 99%

Left Ventricular Diastolic Filling and Cardiovascular Functional Capacity in Older Men

Petrella¹,

Cunningham²,

Paterson³

2000

Experimental Physiology

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“…The aim of this work was to evaluate the behavior of blood constituents, despite percentual plasma volume change, by using a proposed mathematic approach (Beaumont 1972), based on the hematocrit and blood volume.…”

Section: Introductionmentioning

confidence: 99%

Do hematologic constituents really increase due to endurance exercise in horses?

et al. 2012

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Pesq. Vet. Bras. 32(9) The aim of this study was to evaluate the behavior of blood constituents in a group of horses that successfully completed long endurance rides in tropical conditions. Jugular vein puncture was done to collect blood before, during and after rides. Data were analyzed using a mathematic approach, based on the hematocrit and blood volume where the percentual change in plasma volume was used to correct the values of each variable analyzed. Signiϐicance was inferred when P<0.05. The proposed mathematical model to assess blood constituents concentrations allowed the observation of a different pattern of the variables behavior, pointing out that the approach followed by the authors could be more sensitive than ones that did not take this routine. In conclusion, the method used in this study enabled to monitor the physiological processes that actually occur during endurance effort in tropical conditions.

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“…R varied between 0.974 and 0.994 for sodium, potassium, urea and haematocrit. Changes in plasma volume were determined from the haematocrit values according to Beaumont (1972).…”

Section: Anthropometric and Laboratory Measurementsmentioning

confidence: 99%

Does a 24-hour ultra-swim lead to dehydration?

Knechtle¹,

Knechtle²,

Kohler³

et al. 2011

JHSE

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Knechtle B, Knechtle P, Kohler G, Rosemann T. Does a 24-hour ultra-swim lead to dehydration? J. Hum. Sport Exerc. Vol. 6, No. 1, pp. 68-79, 2011. We investigated the change in body composition and hydration status in one male ultra-endurance swimmer during a 24-hour swim. Body mass, percent body fat and skeletal muscle mass using the anthropometric method as well as total body water using bioelectrical impedance analysis were determined pre race, every 6 hours and after the race. Parameters of hydration status (urinary specific gravity, haematocrit, plasma sodium) and skeletal muscle damage (plasma urea) were measured at the same time. The swimmer achieved a total distance of 41.1 km. Body mass decreased by 1.6 kg, skeletal muscle mass by 1.5 kg, body fat by 2.4 kg and total body water by 3.9 l. Urinary specific gravity remained unchanged at 1.015 g/ml. Haematocrit increased from 46 to 47, plasma volume decreased by 4 % and plasma sodium by 4.0 mmol/l. We found in this ultra-swimmer a decrease in body mass of 1.7 % and a consistent urinary specific gravity of 1.015 g/ml. According to the general concept of dehydration, this corresponds to minimal dehydration.

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Evaluation of hemoconcentration from hematocrit measurements.

Cited by 441 publications

References 0 publications

Left Ventricular Diastolic Filling and Cardiovascular Functional Capacity in Older Men

Left Ventricular Diastolic Filling and Cardiovascular Functional Capacity in Older Men

Do hematologic constituents really increase due to endurance exercise in horses?

Does a 24-hour ultra-swim lead to dehydration?

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