Hematocrit and hematocrit viscosity ratio during exercise in athletes: Even closer to predicted optimal values?
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Hematocrit and hematocrit viscosity ratio during exercise in athletes: Even closer to predicted optimal values?
The hemorheological theory of optimal hematocrit suggests that the best value of hematocrit (hct) should be that which results in the highest value of the hematocrit/viscosity (h/η) ratio. Trained athletes compared to sedentary subjects have a lower hct, but a higher h/η, and endurance training reduces the discrepancy between the actual hct and the ⪡ideal⪢ hct that can be predicted with a theor...
متن کاملThe optimal hematocrit increases during exercise.
TO THE EDITOR: We appreciate the approach of Drs. Stark and Schuster (13) to elaborate a systematic foundation of the optimal hematocrit concept on physics. However, some corrections and additional information are necessary. It is important to note that the empirical description of Pries et al. (7)—in contrast to the theoretical approaches for bulk viscosity—is based on experiments for tube flo...
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D URING measurements of total body red cell volume by the Cr51-technic in this laboratory, normal or elevated values were observed in several patients with moderate “anemia”, as judged by the hematocrit of peripheral venous blood. #{176} In each instance, marked to massive splenomegaly was present and increased localization of red cell radioactivity in the spleen was noted by body surface scann...
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متن کاملBlood viscosity in tube flow: dependence on diameter and hematocrit.
Since the original publications by Martini et al. (Dtsch. Arch. Klin. Med. 169: 212-222, 1930) and Fahraeus and Lindqvist (Am. J. Physiol. 96: 562-568, 1931), it has been known that the relative apparent viscosity of blood in tube flow depends on tube diameter. Quantitative descriptions of this effect and of the dependence of blood viscosity on hematocrit in the different diameter tubes are req...
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ژورنال
عنوان ژورنال: Clinical Hemorheology and Microcirculation
سال: 2017
ISSN: 1386-0291,1875-8622
DOI: 10.3233/ch-168012