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Effects of α-adrenergic blockade via phentolamine infusion on forearm blood flow (FBF) (A) and forearm vascular conductance (FVC) (B) at rest and during exercise under normoxic and hyperoxic conditions (n = 8). FBF and FVC were similar between normoxia and hyperoxia at rest; however, FBF and FVC were blunted during hyperoxic compared with normoxic exercise. *P < 0.01 vs. normoxic exercise.
