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• W2091915231 startingPage "279" @default.
• W2091915231 abstract "The optimal hematocrit (Hctopt) hypothesis was tested by altering Hct (and arterial blood oxygen content, CaO2) between extreme states of anemia and polycythemia (Hct = 8–55%) in the rainbow trout. Since blood viscosity (η) effects on cardiac output (Q̇) and O2 transport (ṪO2) are likely to be greatest when O2 demand and Q̇ are maximal, we challenged fish to swim to their critical swimming velocity (Ucrit) in a swim-tunnel respirometer at 13°C and measured maximal oxygen uptake (V̇O2max), maximum Q̇(Q̇max), and other cardiovascular variables. In addition, experimental temperature was lowered to 5°C to increase η. Consistent with the Hctopt hypothesis, the decreased CaO2 in anemic (Hct < 22%) fish caused significant reductions in Ucrit and V̇O2max. In contradiction to the Hctopt hypothesis, and despite an exponential relationship between η and Hct, maximal ṪO2 (ṪO2max) and Ucrit increased with polycythemia up to Hct 55%. Although there was a peak for V̇O2max, it occurred at an Hct (42%) well above the normocythemic range (23–33%). These results clearly demonstrate that η is not significant in setting normocythemia in rainbow trout. The novel finding of an Hct-dependent relationship for exercise-induced arterial hypoxemia may be indicative of a diffusion limitation to normocythemia. We suggest that factors involved in setting normocythemia in vertebrates should include diffusion limitations to oxygen transfer in addition to blood viscosity and oxygen transport constraints." @default.
• W2091915231 created "2016-06-24" @default.
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• W2091915231 date "1995-12-01" @default.
• W2091915231 modified "2023-09-26" @default.
• W2091915231 title "Hematocrit in oxygen transport and swimming in rainbow trout (Oncorhynchus mykiss)" @default.
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• W2091915231 doi "https://doi.org/10.1016/0034-5687(95)00065-8" @default.
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