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Figure 4 Exercise and viscosity parameters are compared between patients with hematocrit (Hct) 65% or <65%. Those with higher Hct had a longer mean treadmill exercise duration (A) and higher peak oxygen consumption (VO₂) (B) despite higher whole blood viscosity at low shear (C) and high shear (D) in the same group. VO₂ = oxygen consumption; low shear = 0.27 s^–1; high shear = 128.5 s^–1.